AMC MCQ (CAT) surgery questions

The classical history of periumbilical pain migrating to the right iliac fossa, with localised tenderness at McBurney's point (one-third of the distance from the anterior superior iliac spine to the umbilicus), low-grade fever and anorexia is highly characteristic of acute appendicitis. This migratory pattern reflects initial visceral referred pain from midgut distension followed by localised somatic pain once the inflamed appendix irritates the parietal peritoneum. It is the most common surgical cause of an acute abdomen in young adults and should be assumed until excluded. Diagnosis is primarily clinical, supported by inflammatory markers and imaging if the presentation is atypical.

• B. Diverticulitis typically occurs in older patients and usually affects the left colon, presenting with left iliac fossa pain.
• C. Mesenteric adenitis usually follows a viral illness and causes more diffuse, less localised tenderness without true peritonism.
• D. Crohn's disease typically has a more chronic course with weight loss and altered bowel habit rather than an acute migratory pain pattern.
• E. Meckel's diverticulitis is rare and cannot be distinguished clinically from appendicitis, so it is not the most likely diagnosis given the classic presentation.

A crescent of free gas under the diaphragm, most often the right hemidiaphragm, on an erect chest X-ray is the classic finding of pneumoperitoneum from a perforated hollow viscus such as a peptic ulcer. NSAID use is a major risk factor for peptic ulcer perforation. The erect chest X-ray is the simplest and most readily available test to detect free intraperitoneal air, although a normal film does not exclude perforation and CT is more sensitive if the diagnosis remains uncertain. Rigler's sign is a supine finding, not seen on an erect chest film, and reflects the same underlying pneumoperitoneum.

• A. Rigler's sign is described on a supine abdominal film, not an erect chest X-ray.
• B. A coffee bean sign is characteristic of sigmoid volvulus, not perforation.
• C. Ground-glass opacification suggests a pulmonary process such as pneumonia, not perforation.
• E. Air-fluid levels on an erect film suggest bowel obstruction rather than perforation.

Current evidence and Therapeutic Guidelines recommend early laparoscopic cholecystectomy, ideally within 7 days (and preferably within 72 hours) of symptom onset, for patients with acute cholecystitis who are fit for surgery. Early surgery reduces hospital stay and complication rates compared with initial conservative management followed by delayed interval cholecystectomy. Intravenous antibiotics and analgesia are given as supportive therapy while awaiting theatre, not as a substitute for surgery in a fit patient. Percutaneous cholecystostomy is reserved for patients too unstable or unfit for surgery.

• A. There is no evidence of choledocholithiasis or bile duct obstruction here, so ERCP is not indicated.
• B. Deferring surgery for 6 weeks exposes the patient to a higher risk of recurrent cholecystitis and complications compared with early surgery.
• C. Open cholecystectomy is reserved for cases with complications or conversion from laparoscopic surgery, not first-line elective management.
• D. Cholecystostomy is a temporising measure for patients unfit for surgery, not appropriate for this fit 45-year-old.

This patient has Charcot's triad (fever, jaundice, right upper quadrant pain) plus hypotension and altered mental status, consistent with Reynolds' pentad, indicating severe acute cholangitis. This is a medical emergency requiring prompt resuscitation with intravenous fluids and broad-spectrum antibiotics, followed by urgent biliary decompression, most commonly by ERCP, within 24 hours. Delaying decompression in severe cholangitis risks progression to septic shock and multi-organ failure. Cholecystectomy can be performed electively after the acute episode resolves.

• A. Cholecystectomy does not relieve the biliary obstruction causing cholangitis and is inappropriate as initial management of this emergency.
• B. Oral therapy and outpatient follow-up are dangerously inadequate for a septic, hypotensive patient.
• C. Delaying drainage for imaging and elective ERCP risks fatal deterioration in severe cholangitis.
• E. PTC is reserved for cases where ERCP is unavailable or unsuccessful, not first-line in a patient who can proceed to ERCP.

This patient's tachycardia, tachypnoea, hypoxaemia and elevated urea indicate at least one systemic inflammatory response syndrome criterion and features predicting severe pancreatitis, warranting close monitoring in a high-dependency or intensive care unit. Early, adequate intravenous crystalloid resuscitation guided by clinical response (urine output, heart rate, blood pressure) is the cornerstone of initial management to prevent hypovolaemia-related complications such as pancreatic necrosis and acute kidney injury. Prophylactic antibiotics are not routinely recommended in acute pancreatitis unless infected necrosis is confirmed. Early enteral nutrition, as tolerated, is preferred over prolonged fasting or routine parenteral nutrition.

• A. Prolonged bowel rest with minimal fluids delays recovery and does not address the fluid requirements of severe pancreatitis.
• C. Parenteral nutrition is reserved for patients unable to tolerate enteral feeding; early oral or enteral intake is preferred when feasible.
• D. Routine prophylactic antibiotics are not indicated in acute pancreatitis without evidence of infection.
• E. A single small bolus with subsequent fluid restriction is inadequate for a patient showing signs of severe pancreatitis with hypoxaemia and tachycardia.

In the absence of signs suggesting bowel ischaemia, strangulation or closed-loop obstruction (such as fever, tachycardia, peritonism, rising lactate or specific CT findings), adhesional small bowel obstruction is initially managed conservatively with nasogastric decompression, intravenous fluid resuscitation, correction of electrolyte abnormalities and close serial clinical reassessment. Many cases resolve without surgery. Indications for surgical intervention include failure to improve after 48-72 hours of conservative management, or any clinical or radiological evidence of ischaemia, perforation or strangulation, which are absent here.

• A. Immediate surgery is not indicated when there is no evidence of ischaemia or strangulation; a trial of conservative management is appropriate first.
• B. Discharge is unsafe given ongoing obstruction; the patient requires admission for decompression and monitoring.
• C. Emergency resection is reserved for confirmed bowel ischaemia or necrosis, not an uncomplicated obstruction on initial assessment.
• D. A water-soluble contrast study can help predict resolution but does not mandate laparotomy regardless of its result.

Erythema, warmth, and irreducibility of a groin hernia with signs of bowel obstruction indicate strangulation, a surgical emergency requiring urgent operative exploration to assess bowel viability and repair the hernia. Attempting reduction risks reducing non-viable or perforated bowel into the peritoneal cavity, causing peritonitis. Imaging and delayed elective repair are inappropriate once strangulation is suspected clinically, as bowel ischaemia progresses rapidly. The diagnosis here is made on clinical grounds and should not delay theatre.

• A. Observation risks bowel necrosis and perforation; strangulation is a surgical emergency, not something to monitor.
• B. Elective repair is inappropriate; strangulation with overlying skin changes and obstruction requires emergency surgery.
• C. Imaging would delay definitive treatment when the clinical picture already indicates strangulation.
• D. Forceful reduction of a strangulated hernia risks reducing non-viable bowel, causing peritonitis and missed perforation.

The pubic tubercle is the key anatomical landmark distinguishing groin hernias: an inguinal hernia emerges superomedial to the pubic tubercle, whereas a femoral hernia emerges inferolateral to it, passing through the femoral canal. This finding is the definitive clinical discriminator because the other features listed, such as reducibility, cough impulse and female predominance, can occur with either hernia type and are not specific. Although femoral hernias are relatively more common in women, inguinal hernias are still the most common hernia type overall in women, making sex an unreliable discriminator. Correct localisation relative to the pubic tubercle guides surgical approach and informs urgency, as femoral hernias have a higher risk of strangulation.

• A. A cough impulse can be present in both inguinal and femoral hernias and does not differentiate them.
• C. Reducibility on lying flat occurs with both inguinal and femoral hernias and does not localise the defect.
• D. Softness and compressibility are nonspecific findings common to both hernia types.
• E. Female predominance is a relative association, not a reliable discriminator, since inguinal hernias remain more common overall in women.

Umbilical hernias in infants are common, result from incomplete closure of the umbilical ring, and the great majority close spontaneously by 4 to 5 years of age without intervention. Reassurance and watchful waiting is appropriate for an asymptomatic, easily reducible hernia with a defect of this size. Surgical referral is indicated if the hernia persists beyond 4 to 5 years, if it is large (greater than 1.5-2 cm) and unlikely to close, or if there are episodes of incarceration or strangulation, none of which are present here. Strapping or taping has no evidence of benefit and is not recommended.

• A. Ultrasound is unnecessary as the diagnosis and plan can be determined clinically in an uncomplicated case.
• B. Urgent referral is not warranted in an asymptomatic, easily reducible hernia with no signs of incarceration.
• D. Elective repair in infancy is unnecessary given the high rate of spontaneous closure and the absence of complications.
• E. Strapping or taping has no evidence of accelerating closure and is not recommended practice.

Any new, discrete breast lump in a woman over 40 years requires urgent referral for triple assessment, comprising clinical breast examination, imaging (mammography with or without ultrasound) and tissue sampling by core biopsy, to exclude malignancy. This combined approach has the highest sensitivity and specificity for detecting breast cancer compared with any single modality. Delaying assessment with reassurance or a trial of medical therapy risks delayed diagnosis of malignancy. Routine two-yearly screening mammography is for asymptomatic women and is not an appropriate substitute for diagnostic work-up of a palpable lump.

• A. There is no role for hormonal therapy in the assessment of a new breast lump; this would dangerously delay diagnosis.
• B. Relying on ultrasound alone without clinical assessment and biopsy of a clinically suspicious mass is inadequate; triple assessment is the standard.
• C. A new discrete lump in a woman over 40 should not simply be observed, as this risks delaying cancer diagnosis.
• E. Routine biennial screening mammography is for asymptomatic surveillance, not for diagnostic assessment of a new palpable lump.

For early-stage invasive breast cancer with a tumour this size and no clinical signs or symptoms suggesting metastatic disease, staging CT of the chest, abdomen and pelvis together with a bone scan is the standard investigation to assess for distant metastases prior to definitive surgery. Routine PET scanning is not recommended for staging early breast cancer because of lower specificity and higher cost, and is reserved for equivocal findings or locally advanced or metastatic disease. Brain MRI and skeletal survey are not first-line and are reserved for patients with specific neurological or bone symptoms. Repeat biopsy with immunohistochemistry is relevant for tumour biology and receptor status, but does not address staging for distant spread.

• A. Whole-body PET is not routinely recommended for staging early breast cancer and is reserved for selected equivocal or advanced cases.
• B. Plain radiograph skeletal survey has been superseded by bone scan or CT and is not first-line for staging.
• C. Brain MRI is not indicated for staging in the absence of neurological symptoms.
• D. Immunohistochemistry informs tumour biology and receptor status, not distant staging.

A fibroadenoma smaller than 3 cm with concordant benign imaging and biopsy findings in a young woman can be safely managed with reassurance and clinical follow-up, as fibroadenomas have negligible malignant potential and many involute over time. Surgical excision is reserved for lesions that are large (typically greater than 3 cm), rapidly growing, symptomatic, or where there is diagnostic uncertainty or patient preference after discussion. Mastectomy and tamoxifen have no role in management of a straightforward benign fibroadenoma. Routine repeat biopsy is unnecessary once imaging and histology are concordant for a benign diagnosis.

• A. Fibroadenomas have negligible malignant potential; routine excision is not required for small, biopsy-confirmed lesions.
• B. Tamoxifen has no established role in the management of fibroadenomas.
• C. Repeat biopsy is unnecessary once imaging and core biopsy are concordant for a benign diagnosis.
• E. Mastectomy is a vastly disproportionate and inappropriate treatment for a benign fibroadenoma.

Persistent breast erythema, oedema and peau d'orange skin that fails to settle after an adequate course of antibiotics should raise suspicion for inflammatory breast cancer, which can mimic mastitis closely in a lactating woman. The absence of fever and a fluctuant collection argues against a simple abscess. Any woman with mastitis-like changes not resolving with appropriate antibiotics requires imaging and tissue diagnosis (core biopsy, including skin punch biopsy if indicated) to exclude malignancy before further antibiotic cycling or drainage procedures are pursued. Delay in recognising inflammatory breast cancer worsens prognosis, so a low threshold for biopsy is essential.

• B. Simply changing antibiotics without imaging risks missing an underlying malignancy and delays diagnosis.
• C. There is no fluctuant collection to suggest an abscess requiring drainage.
• D. Stopping breastfeeding does not address the need to exclude malignancy and is not evidence-based for unresolving mastitis.
• E. Failure to respond to antibiotics after 6 days is not expected in typical lactational mastitis and warrants further work-up.

In a patient with a clinically and sonographically node-negative axilla undergoing breast-conserving surgery, a negative sentinel lymph node biopsy reliably excludes clinically significant axillary metastasis and no further axillary surgery is needed. Sentinel node biopsy has largely replaced axillary dissection for staging the axilla in early breast cancer because it has comparable accuracy with far less morbidity, such as lymphoedema. Completion axillary dissection is reserved for sentinel node-positive disease in specific circumstances, not for a negative result. This approach follows current evidence-based guidelines for surgical management of early, node-negative breast cancer.

• B. Completion dissection is unnecessary and increases morbidity when the sentinel node is negative.
• C. Sampling additional nodes beyond the sentinel nodes is not standard once sentinel nodes are negative.
• D. Intraoperative PET imaging of the axilla is not part of standard surgical staging.
• E. Axillary radiotherapy is not indicated as a substitute when the sentinel node is already negative.

Unilateral, persistent nipple eczema that fails to respond to topical steroids is a red flag for Paget's disease of the nipple, an intraepithelial spread of underlying ductal carcinoma (in situ or invasive) into the nipple epidermis. Unlike eczema, which is usually bilateral, responds to steroids, and spares the nipple itself in favour of the areola, Paget's disease typically starts on the nipple and extends outward, with erosion that persists. A full-thickness punch biopsy of the nipple is required to confirm the diagnosis histologically, showing malignant Paget cells within the epidermis. Early biopsy prevents delayed diagnosis of an underlying malignancy.

• A. Further steroid treatment is inappropriate given failure of an adequate trial and risk of delaying cancer diagnosis.
• B. Reassurance without biopsy risks missing underlying malignancy in a classic presentation of Paget's disease.
• D. Patch testing is used for suspected allergic contact dermatitis, which is less likely given the unilateral, persistent nature of this lesion.
• E. Candidal intertrigo typically affects skin folds rather than causing isolated nipple erosion and would not explain failure to respond to steroids.

In a euthyroid patient with a palpable solitary thyroid nodule, the first investigation is a thyroid ultrasound, which characterises the nodule's size, composition and suspicious features and allows risk stratification using a system such as TIRADS. This determines whether fine needle aspiration cytology is indicated and, if so, guides accurate image-guided sampling. Radioactive iodine uptake scanning is reserved for cases with a suppressed TSH to assess for a functioning (hot) nodule. Proceeding directly to fine needle aspiration without ultrasound risks sampling error and missing suspicious features that influence management.

• B. Radioiodine uptake scanning is used when TSH is suppressed to look for a hyperfunctioning nodule, not in this euthyroid patient.
• C. Fine needle aspiration should be guided by ultrasound findings and TIRADS score rather than performed blindly first.
• D. CT scanning is not first-line for nodule characterisation and involves unnecessary radiation and contrast exposure.
• E. Thyroglobulin is a tumour marker used for monitoring after thyroidectomy for differentiated thyroid cancer, not for initial nodule evaluation.

Papillary thyroid carcinoma is the most common thyroid malignancy and classically presents with a firm, irregular, fixed thyroid mass, cervical lymphadenopathy from early lymphatic spread, and vocal cord palsy from recurrent laryngeal nerve invasion. The combination of local invasion (fixation, hoarseness) and regional nodal spread in a euthyroid patient strongly favours malignancy over benign nodular disease. Multinodular goitre and thyroiditis do not typically cause vocal cord palsy or hard fixed nodal disease. This clinical picture warrants urgent ultrasound, fine needle aspiration and laryngoscopy-confirmed assessment of vocal cord function, with referral for surgical management.

• A. Thyroid lymphoma is rare and usually arises in longstanding Hashimoto's thyroiditis with rapid diffuse gland enlargement rather than this focal invasive pattern.
• B. Multinodular goitre is usually soft and multilobar, and does not cause vocal cord palsy or hard fixed lymphadenopathy.
• C. Subacute thyroiditis presents with a painful, tender gland and systemic symptoms, not a painless fixed mass with nodal spread.
• D. Hashimoto's thyroiditis typically causes a diffuse, rubbery goitre with hypothyroidism, not focal invasive disease with nerve palsy.

Airway obstruction from an expanding post-thyroidectomy haematoma is a surgical emergency with a very narrow window before complete airway obstruction occurs. The immediate life-saving action is to open the wound at the bedside, releasing the skin and strap muscle sutures to decompress the haematoma and relieve tracheal compression, without waiting for transfer to theatre. This can be done rapidly by any clinician present using simple instruments, and definitive re-exploration in theatre follows once the airway is secured. Delaying decompression to obtain imaging, give steroids, or transfer the patient risks fatal airway obstruction.

• A. Steroids do not relieve mechanical compression from an expanding haematoma and observation risks complete airway obstruction.
• B. Imaging causes dangerous delay in a time-critical airway emergency and adds no useful information.
• C. Nebulised adrenaline does not address mechanical tracheal compression from a haematoma and delays essential action.
• E. Transfer to theatre takes too long; the wound must be decompressed immediately at the bedside first.

Perioral and digital paraesthesia with a positive Chvostek's sign (facial twitching on tapping the facial nerve) in the setting of a corrected calcium of 1.78 mmol/L indicates symptomatic hypocalcaemia from inadvertent parathyroid gland injury or devascularisation during thyroidectomy. Symptomatic hypocalcaemia with a level this low requires prompt intravenous calcium gluconate to prevent progression to tetany, laryngospasm or seizures. Oral calcium and vitamin D supplementation are appropriate for mild, asymptomatic hypocalcaemia but are too slow for this symptomatic presentation. Serum parathyroid hormone and magnesium can be checked as part of work-up but should not delay urgent calcium correction.

• A. Checking parathyroid hormone is useful for investigation but should not delay urgent treatment of symptomatic hypocalcaemia.
• B. These symptoms indicate significant hypocalcaemia requiring active treatment, not simple reassurance, given the risk of tetany or seizure.
• C. Magnesium sulfate is given if hypomagnesaemia is contributing, but calcium correction is the priority here given the Chvostek's sign and clear hypocalcaemia.
• E. Oral calcium alone acts too slowly for symptomatic hypocalcaemia with a significantly low corrected calcium level.

Once the biochemical diagnosis of primary hyperparathyroidism is confirmed by an elevated calcium with an inappropriately normal or elevated parathyroid hormone, preoperative localisation of the abnormal parathyroid gland is required before surgery. Sestamibi scintigraphy, often combined with SPECT-CT, identifies hyperfunctioning parathyroid tissue and allows planning of a minimally invasive, focused parathyroidectomy rather than bilateral neck exploration. Thyroid ultrasound may be used as a complementary localisation tool but does not reliably localise parathyroid adenomas on its own. Bone density scanning assesses skeletal complications of hyperparathyroidism but does not guide surgical localisation.

• B. Bone density assessment evaluates complications of hyperparathyroidism but does not localise the abnormal gland for surgery.
• C. Thyroid ultrasound alone is not the primary localisation study for parathyroid adenomas and has lower sensitivity than sestamibi scanning.
• D. Urinary free cortisol investigates Cushing's syndrome, which is not suggested by this clinical and biochemical picture.
• E. The diagnosis is already biochemically established; repeating tests in 6 months delays appropriate surgical planning.

Confirmed low-grade dysplasia in Barrett's oesophagus carries an increased risk of progression to adenocarcinoma, so management shifts from standard non-dysplastic surveillance intervals. Current guidelines recommend either intensified surveillance at 6-12 month intervals or referral for endoscopic eradication therapy such as radiofrequency ablation, with confirmation of the diagnosis by a second expert pathologist (as occurred here). Non-dysplastic Barrett's is typically monitored every 3-5 years depending on segment length, which is insufficient once dysplasia is identified. Oesophagectomy is reserved for high-grade dysplasia or early cancer not amenable to endoscopic therapy.

• B. PPI therapy alone does not address the need for ongoing surveillance or eradication of dysplastic tissue.
• C. Oesophagectomy is reserved for high-grade dysplasia or early carcinoma unsuitable for endoscopic treatment.
• D. This interval applies to non-dysplastic Barrett's oesophagus, not low-grade dysplasia.
• E. This interval is also too long once dysplasia has been confirmed.

This patient has an intermediate probability of choledocholithiasis: deranged liver function tests and a dilated common bile duct on ultrasound, but no stone directly visualised. Current guidelines recommend MRCP in this intermediate-risk group to confirm the presence of a duct stone non-invasively before committing to the risks of ERCP, which carries risks including pancreatitis and perforation. ERCP should be reserved for patients with high probability of choledocholithiasis (visualised stone, cholangitis, or bilirubin markedly elevated with dilated duct) where therapeutic intervention is anticipated. HIDA scanning assesses cystic duct patency in suspected acute cholecystitis, not choledocholithiasis.

• A. Surgery alone without prior duct clearance risks retained stones; intraoperative cholangiogram does not replace preoperative imaging in this context.
• C. Proceeding directly to ERCP is appropriate only in high-probability cases; this intermediate-risk case warrants non-invasive imaging first.
• D. Observation delays diagnosis and risks progression to cholangitis or pancreatitis.
• E. HIDA scan evaluates cystic duct obstruction in cholecystitis, not common bile duct stones.

Painless progressive jaundice with a palpable, non-tender gallbladder (Courvoisier's sign) in an older patient with weight loss is highly suggestive of malignant distal biliary obstruction, most commonly carcinoma of the head of the pancreas. The tumour obstructs the common bile duct, causing gradual gallbladder distension without the inflammation and tenderness seen in gallstone disease. The next appropriate step after this clinical diagnosis is contrast-enhanced CT of the abdomen for staging and assessment of resectability. Choledocholithiasis typically causes painful, intermittent jaundice with a tender, non-palpable gallbladder due to associated inflammation and fibrosis.

• A. Acute cholecystitis presents with fever, right upper quadrant pain and tenderness, not painless progressive jaundice.
• B. Primary sclerosing cholangitis typically presents in younger patients, often with inflammatory bowel disease, and does not classically cause a palpable gallbladder.
• D. Gallstone obstruction classically causes pain and a gallbladder that is often not palpable due to chronic inflammation and scarring.
• E. Autoimmune hepatitis causes hepatocellular jaundice with elevated transaminases, not an obstructive pattern with a palpable gallbladder.

A change in bowel habit together with unexplained iron deficiency anaemia in an older adult is a red flag for colorectal cancer and warrants prompt colonoscopy, which allows direct visualisation of the entire colon and biopsy of any lesion found. Iron deficiency anaemia without an obvious source such as menstrual loss or overt gastrointestinal bleeding should always prompt investigation of the gastrointestinal tract in patients over 50 years. Treating the anaemia or symptoms without investigating the underlying cause risks missing an underlying malignancy and delaying treatment.

• A. Symptomatic treatment does not address the need to exclude malignancy as the underlying cause.
• C. Faecal occult blood testing is a screening tool for asymptomatic patients, not appropriate when symptoms and anaemia are already present.
• D. Non-contrast CT is inferior to colonoscopy for detecting and biopsying mucosal lesions.
• E. Treating the anaemia without investigating its cause risks missing an underlying colorectal malignancy.

This presentation is consistent with a perianal abscess: localised pain, fever and a tender fluctuant perianal swelling. The definitive management of a perianal abscess is prompt incision and drainage under anaesthesia, as antibiotics alone are inadequate to resolve a collection of pus and delay in drainage risks progression to necrotising infection or fistula formation. Antibiotics may be added for surrounding cellulitis, immunocompromise or systemic sepsis, but are not a substitute for drainage. Seton placement and MRI are relevant to management of an established fistula-in-ano, which is not yet confirmed here as there is no visible external opening.

• B. Seton placement is used in fistula-in-ano management, not for an undrained abscess.
• C. Imaging may be used for complex or recurrent disease but should not delay drainage of a straightforward abscess.
• D. Antibiotics alone do not adequately treat an abscess collection and should not replace drainage.
• E. Conservative measures alone are inadequate and risk progression of untreated sepsis.

The combination of bloody, mucoid diarrhoea, tenesmus, increased stool frequency, weight loss and a mildly raised CRP in a young adult is characteristic of ulcerative colitis, which classically causes continuous mucosal inflammation beginning in the rectum. Colorectal cancer is rare at this age without a hereditary syndrome and typically presents with a palpable mass or more insidious symptoms rather than tenesmus and mucus. Infective gastroenteritis is usually acute and self-limiting rather than persisting for ten weeks. Internal haemorrhoids cause painless bleeding without mucus, tenesmus or systemic weight loss. Irritable bowel syndrome does not cause rectal bleeding, mucus discharge or weight loss.

• B. IBS is a diagnosis of exclusion that does not cause bleeding, mucus or weight loss.
• C. Adenocarcinoma is uncommon in a 24-year-old without a strong family history or polyposis syndrome and usually presents differently.
• D. Haemorrhoidal bleeding is usually painless and bright red without mucus, tenesmus or weight loss.
• E. A ten-week duration is inconsistent with typical self-limiting infective gastroenteritis.

Topical glyceryl trinitrate (GTN) 0.2% is first-line pharmacological treatment for a chronic anal fissure, working by relaxing the internal anal sphincter and improving local blood flow to promote healing, alongside stool softeners and adequate fibre and fluid intake. Surgical options such as lateral internal sphincterotomy are reserved for fissures that fail an adequate trial of topical therapy, typically after 6–8 weeks. Botulinum toxin is a second-line option used when topical nitrates fail or are not tolerated, usually before resorting to surgery. Metronidazole has no established role in fissure management. Hydrocortisone cream does not address the underlying sphincter spasm and is not recommended as primary therapy.

• A. Sphincterotomy is reserved for fissures that fail an adequate trial of conservative and topical therapy.
• B. Botulinum toxin is second-line, used after topical GTN has failed or caused intolerable side effects.
• C. Antibiotics have no role in uncomplicated anal fissure management.
• E. Topical steroids do not relax the internal sphincter and are not first-line treatment for fissures.

This patient has acute limb ischaemia with features including pain, pallor, pulselessness, paraesthesia and paralysis, indicating a threatened limb likely secondary to embolism from atrial fibrillation. This is a surgical emergency requiring immediate vascular surgical referral for consideration of embolectomy, angioplasty or bypass, as irreversible muscle and nerve damage can occur within 6 hours of onset. Delaying care for outpatient imaging or review risks limb loss. While anticoagulation is part of initial management, definitive revascularisation requires urgent surgical input, not discharge. Ankle-brachial index is unreliable and inappropriate in acute ischaemia with neurological deficit, where time to theatre is critical.

• A. Anticoagulation alone without urgent surgical revascularisation risks limb loss given the motor deficit present.
• C. Duplex ultrasound would delay definitive treatment in a time-critical emergency.
• D. ABI measurement is unreliable in acute ischaemia and would delay the urgent surgical referral needed.
• E. Outpatient review is inappropriate for a limb with sensory and motor deficit, which risks permanent damage within hours.

The ankle-brachial index (ABI) is calculated as the higher of the two ankle pressures (dorsalis pedis or posterior tibial) divided by the higher brachial systolic pressure; here the higher ankle pressure is 75 mmHg and the brachial pressure is 140 mmHg, giving an ABI of 0.54. An ABI between 0.5 and 0.9 is consistent with moderate peripheral arterial disease, correlating clinically with intermittent claudication as described. An ABI below 0.4 suggests severe disease or critical limb ischaemia, which would typically present with rest pain or tissue loss rather than exertional claudication alone. An ABI above 1.3 suggests non-compressible, calcified vessels, often seen in diabetes, while a normal ABI is between 0.9 and 1.3.

• B. This value and interpretation are incorrect; an ABI above 1.3, not 1.07, suggests calcification, and 1.07 would be miscalculated here.
• C. This calculation is incorrect and would suggest more severe disease than is clinically consistent with claudication alone.
• D. An ABI of 0.54 corresponds to moderate disease with claudication, not critical limb ischaemia, which usually presents with rest pain.
• E. This calculation uses the wrong ankle pressure and does not match the clinical picture of claudication.

Elective surgical repair is indicated for abdominal aortic aneurysms that reach 5.5 cm in diameter, grow more than 1 cm per year, or become symptomatic, regardless of patient age if otherwise fit for surgery. This patient's aneurysm is both above the 5.5 cm threshold and has grown rapidly (0.8 cm in six months, well over 1 cm/year), both independent indications for referral. Continued surveillance at any interval would inappropriately delay treatment of a large, rapidly expanding aneurysm with significant rupture risk. Blood pressure control is important adjunctive management but does not substitute for definitive referral once repair criteria are met.

• A. Medical optimisation does not replace the need for definitive surgical referral once size or growth criteria are met.
• B. Annual surveillance applies to small, stable aneurysms below the referral threshold, not this case.
• D. CT angiography may be used for pre-operative planning but delaying it to twelve months is inappropriate given the aneurysm already meets repair criteria.
• E. Further surveillance delays necessary treatment; the aneurysm already meets criteria for repair.

Magnetic resonance imaging is the most sensitive and specific imaging modality for diagnosing osteomyelitis in a diabetic foot ulcer, particularly when plain radiographs are normal or equivocal, as it can detect early marrow oedema and soft tissue extent before bony destruction is visible on X-ray. A positive 'probe-to-bone' test in this clinical setting already raises strong suspicion for osteomyelitis, and MRI confirms the diagnosis and delineates the extent of infection for surgical planning. Repeating plain radiographs delays diagnosis, as bony changes may take 2–4 weeks to appear and lack sensitivity even then. Bone scans are sensitive but poorly specific, especially in the setting of neuropathic or Charcot changes. Ultrasound and CT are inferior to MRI for assessing bone marrow involvement and soft tissue extent.

• A. Bone scans are sensitive but lack specificity, particularly in diabetic feet with coexisting Charcot change or soft tissue infection.
• B. CT has lower sensitivity than MRI for detecting early marrow changes of osteomyelitis.
• D. Plain radiographs are insensitive early in osteomyelitis and would delay diagnosis and treatment.
• E. Ultrasound does not adequately assess bone marrow involvement required to diagnose osteomyelitis.

Uncomplicated varicose veins with mild symptoms and no skin changes, ulceration or bleeding should initially be managed conservatively with graduated compression stockings, weight management, regular exercise and leg elevation. Referral to vascular surgery for interventional treatment such as endovenous ablation or stripping is reserved for cases with significant symptoms unresponsive to conservative measures, or complications such as bleeding, recurrent thrombophlebitis, skin changes or venous ulceration. Oral venoactive agents have limited evidence for efficacy and are not first-line therapy in Australian guidelines. Urgent duplex ultrasound and specialist referral are not warranted for mild, uncomplicated symptoms.

• A. Surgical stripping is an outdated and more invasive option, inappropriate as first-line management of mild symptoms.
• B. Interventional referral is reserved for cases with significant symptoms refractory to conservative care or complications, not mild uncomplicated disease.
• C. Venoactive drugs have limited evidence and are not standard first-line therapy in Australian practice.
• E. There is no indication for urgent referral or ultrasound when there are no signs of complication such as ulceration or bleeding.

In symptomatic patients with ipsilateral carotid stenosis of 70-99%, carotid endarterectomy combined with best medical therapy significantly reduces the risk of recurrent stroke compared with medical therapy alone, with the greatest benefit when performed within two weeks of the triggering event. The benefit diminishes rapidly with delay, so urgent referral is essential once the patient is stable. Medical therapy (antiplatelet, statin, blood pressure control) is continued perioperatively but does not replace surgery at this degree of stenosis. Stenting is generally reserved for patients at high surgical risk or with anatomical factors unsuitable for endarterectomy.

• A. Waiting for progression to 90% unnecessarily delays treatment that is already indicated at 70-99%.
• B. Dual antiplatelet therapy does not substitute for definitive management of significant symptomatic stenosis.
• C. Stenting is not first-line here and should not be deferred until after a further stroke.
• D. Delaying intervention loses the time-dependent benefit of early surgery after a symptomatic event.

Non-contrast CT KUB is the investigation of choice for suspected renal colic because it has high sensitivity and specificity for detecting ureteric stones, determines stone size and location, and identifies alternative causes of pain without the need for intravenous contrast. Stones smaller than 5 mm have a high likelihood of spontaneous passage, whereas stones larger than 10 mm usually require urological intervention. Ultrasound is useful in pregnancy or children to avoid radiation but is less sensitive for ureteric stones. Intravenous pyelogram and plain KUB films have largely been superseded by CT due to lower sensitivity and the time required.

• A. Intravenous pyelogram has been superseded by CT due to lower sensitivity and need for contrast.
• B. Plain KUB X-ray only detects radio-opaque stones and misses many cases.
• C. Ultrasound alone is less sensitive for detecting ureteric stones, particularly smaller ones.
• D. Contrast is not required for stone detection and increases risk without added diagnostic benefit.

Acute urinary retention with a painful, palpable bladder requires same-day decompression with an indwelling urethral catheter to relieve obstruction and prevent further renal impairment. Immediate catheterisation also allows measurement of residual volume, relief of symptoms, and assessment for underlying causes such as benign prostatic hyperplasia. Alpha-blockers may be commenced after catheterisation to aid a trial without catheter later but do not relieve acute retention. Imaging is useful subsequently to assess the upper tracts but should not delay bladder decompression, and diuretics have no role in relieving outlet obstruction.

• A. Diuretics do not address outlet obstruction and may worsen bladder distension.
• B. Imaging should follow, not precede, relief of a painful obstructed bladder.
• C. Deferring definitive relief for a week risks ongoing renal impairment and patient distress.
• E. Alpha-blockers do not relieve an already obstructed bladder and inappropriately delay decompression.

A firm, irregular prostate nodule on digital rectal examination combined with an elevated PSA is concerning for prostate cancer regardless of the absolute PSA value, and warrants prompt urological referral for biopsy, typically guided by multiparametric MRI. Repeating the PSA alone would delay diagnosis in a patient with an abnormal examination finding. Finasteride can lower PSA levels and would obscure the clinical picture without addressing the underlying concern. Staging investigations such as bone scan are only indicated after a tissue diagnosis of cancer has been established.

• A. Reassurance is inappropriate given a palpable abnormality on examination.
• C. Staging investigations are premature without a confirmed tissue diagnosis.
• D. Finasteride lowers PSA and may mask malignancy rather than investigate it.
• E. Repeating PSA delays diagnosis when the examination finding alone is concerning.

Alpha-1 adrenergic receptor blockers such as tamsulosin relax smooth muscle in the bladder neck and prostate to improve urinary flow, but their action on vascular alpha-1 receptors can cause orthostatic hypotension, dizziness and syncope, particularly after the first dose. Patients should be advised to rise slowly from sitting or lying positions. Gynaecomastia and reduced libido are more characteristic of 5-alpha-reductase inhibitors such as finasteride. Anticholinergic effects like dry mouth are not typical of alpha-blockers, and significant metabolic or renal adverse effects are not characteristic of this drug class.

• A. Weight gain and oedema are not characteristic adverse effects of alpha-blockers.
• C. Gynaecomastia and reduced libido are associated with 5-alpha-reductase inhibitors, not alpha-blockers.
• D. Dry mouth and retention are anticholinergic effects, not typical of alpha-blockers which improve urinary flow.
• E. Hyperkalaemia and renal impairment are not recognised adverse effects of alpha-blockers.

The primary survey in trauma follows the ABCDE sequence, where airway with cervical spine protection takes absolute priority, followed immediately by assessment and management of breathing, since compromise in either is immediately life-threatening. This patient's confusion and respiratory distress mean airway patency and adequacy of ventilation must be addressed before circulation, imaging or limb injuries are managed. Only once airway and breathing are secured should attention turn to circulatory support and fluid resuscitation. Definitive imaging and limb splinting are appropriate later steps once the patient is stabilised.

• A. Femur splinting is a secondary survey priority once life-threatening airway and breathing issues are addressed.
• B. FAST scanning is part of the circulation assessment, which follows airway and breathing in priority.
• D. Fluid resuscitation is important but follows airway and breathing assessment in the primary survey sequence.
• E. Imaging should not precede stabilisation of airway and breathing in an unstable trauma patient.

Non-operative management is the standard of care for haemodynamically stable patients with blunt splenic injury, regardless of grade, provided there is no contrast blush, ongoing bleeding, or peritonitis. This involves admission, bed rest, serial clinical examination and haemoglobin checks, with surgery reserved for haemodynamic instability or failure of conservative management. Angioembolisation is used selectively for contrast blush or pseudoaneurysm rather than routinely for a stable, non-bleeding laceration. The described injury (less than 50% surface involvement, contained haematoma, no active bleeding) is well suited to observation.

• A. Splenectomy is reserved for haemodynamic instability or failed conservative management, not a stable patient with a contained injury.
• B. Embolisation is indicated for contrast blush or pseudoaneurysm, neither of which is present here.
• D. Diagnostic peritoneal lavage is obsolete and has been replaced by CT imaging in stable trauma patients.
• E. Operative repair is unnecessary when the patient is stable and the injury is amenable to observation.

This patient has clinical features of acute compartment syndrome: pain out of proportion to the injury, pain on passive stretch of the muscles, and early sensory change, with the pulse still present because pulselessness is a late and unreliable sign. Compartment syndrome is a surgical emergency diagnosed clinically; waiting for pulselessness risks irreversible muscle and nerve ischaemia. The cast should be removed immediately to relieve external constriction, and if symptoms persist, urgent fasciotomy of all compartments is required within hours to prevent necrosis and limb loss. Compartment pressure measurement may support the diagnosis but should not delay fasciotomy when the clinical picture is clear.

• A. Loosening the cast is appropriate as an initial step but is insufficient on its own once compartment syndrome is clinically established; definitive surgical decompression is required.
• B. CT angiography delays definitive treatment and is not required when the pulse is present and the diagnosis is clinical.
• C. Analgesia alone does not address the underlying compartment pressure and allows ongoing ischaemic injury.
• E. Delaying intervention risks irreversible muscle and nerve damage; compartment syndrome does not resolve with elevation alone.

For melanomas with a Breslow thickness between 1.01 mm and 2.0 mm, current Australian Cancer Council guidelines recommend a wide local excision margin of 10 mm. Margins are tiered by Breslow thickness: 5–10 mm for melanoma in situ, 10 mm for 1.01–2.0 mm thickness, and 10–20 mm for thickness greater than 2.0 mm, balancing adequate local control against unnecessary morbidity from overly wide excision. The initial diagnostic excisional biopsy margin (1–2 mm) is distinct from the definitive therapeutic margin once Breslow thickness is known. Margins are measured clinically from the edge of the original lesion or the biopsy scar, not simply from the visible residual pigmentation.

• A. A 20 mm margin is used for melanomas thicker than 2.0 mm, not for 1.8 mm thickness.
• B. A 30 mm margin exceeds current guideline recommendations for any Breslow thickness category.
• C. A 5 mm margin is appropriate only for melanoma in situ, not for invasive melanoma of this thickness.
• D. A 1 mm margin is appropriate only for the initial diagnostic excisional biopsy, not for definitive wide local excision.

This patient has clinical features of necrotising fasciitis: pain disproportionate to examination findings, systemic toxicity with hypotension and tachycardia, skin discolouration, blistering and subcutaneous crepitus indicating gas-forming organisms. Necrotising fasciitis is a surgical emergency, and the diagnosis is established intraoperatively by the appearance of the fascia and the ease of finger dissection along fascial planes; broad-spectrum antibiotics are started but surgery must not be delayed to await imaging or antibiotic response. Mortality increases significantly with each hour of delay to debridement, so the priority is immediate theatre booking alongside resuscitation and broad-spectrum antibiotics. Imaging may occasionally be used in equivocal cases without systemic toxicity, but it is inappropriate here given the clear clinical picture and haemodynamic instability.

• A. Conservative measures do not address the underlying necrotising infection and allow continued tissue destruction and sepsis.
• B. Imaging delays definitive treatment and is unnecessary when the clinical diagnosis is already strongly suggested by crepitus and systemic toxicity.
• C. Antibiotics alone are inadequate for necrotising fasciitis and delaying surgery for 12 hours risks death from overwhelming sepsis.
• E. Bedside drainage under local anaesthetic is inadequate; this condition requires formal surgical exploration and debridement in theatre, often under general anaesthesia.

A fluctuant, pointing lesion indicates a localised abscess with a fluid collection, and incision and drainage is the definitive treatment because antibiotics alone poorly penetrate the abscess cavity and do not reliably resolve a walled-off collection. Antibiotics are reserved as an adjunct for abscesses with surrounding cellulitis, systemic symptoms, immunosuppression, or in high-risk sites such as the face, not as a substitute for drainage. In contrast, cellulitis without a drainable collection is treated with antibiotics alone, as there is no fluid collection to evacuate. Send pus for culture to guide any adjunctive antibiotic therapy, particularly given rising community rates of methicillin-resistant Staphylococcus aureus.

• A. Topical antibiotics do not address a deep fluctuant collection requiring drainage.
• C. Antibiotics alone are inadequate for a fluctuant abscess because they do not drain the collection.
• D. Intravenous antibiotics without drainage fail to evacuate the abscess cavity and delay resolution.
• E. Observation risks progression and delays definitive treatment of a collection that requires drainage.

Fever within the first 48 hours after surgery is most commonly due to atelectasis, caused by hypoventilation, retained secretions and reduced lung volumes from pain, sedation and immobility after general anaesthesia. The reduced basal air entry and tachypnoea support this diagnosis, which corresponds to the 'wind' category in the classic postoperative fever mnemonic (wind, water, wound, walking, wonder drugs) by timing. Surgical site infection and anastomotic leak typically present later, from day 3 onward. Encouraging deep breathing exercises, early mobilisation and adequate analgesia are the mainstays of both prevention and management.

• A. Deep vein thrombosis causing fever classically presents later, around day 5 or beyond ('walking'), and the wound findings here point to a respiratory cause.
• B. An anastomotic leak typically presents around day 5–7 with signs of sepsis or peritonism, not on day 1 with isolated basal crackles.
• C. Surgical site infections typically become apparent from postoperative day 3 onward, not within the first 24 hours.
• E. Urinary tract infection ('water') usually presents from day 3 onward and her urinalysis is unremarkable.

This patient has multiple risk factors for venous thromboembolism, including major abdominal surgery, obesity and varicose veins, placing her in a moderate-to-high risk category. Current guidelines recommend combined mechanical (graduated compression stockings or intermittent pneumatic compression) and pharmacological prophylaxis with low molecular weight heparin for patients undergoing major surgery with multiple risk factors, continued until she is fully mobile. Mechanical or pharmacological prophylaxis alone is inadequate for this risk profile. Therapeutic-dose anticoagulation is reserved for treating established thromboembolism, not for prophylaxis.

• A. Therapeutic-dose anticoagulation is used to treat confirmed venous thromboembolism, not as prophylaxis, and carries an unacceptably high bleeding risk in this context.
• B. Mechanical prophylaxis alone is insufficient for a patient with multiple risk factors undergoing major abdominal surgery.
• C. Omitting prophylaxis is inappropriate given her risk factors; early mobilisation alone does not adequately reduce venous thromboembolism risk after major surgery.
• E. Pharmacological prophylaxis alone omits the additive mechanical component recommended for moderate-to-high risk patients.

Prophylactic antibiotics should be administered within 60 minutes before skin incision so that adequate tissue and serum concentrations are present at the time contamination risk begins. Cefazolin is appropriate first-line prophylaxis for clean procedures involving prosthetic mesh, covering likely skin flora such as Staphylococcus aureus. Giving the dose too early or too late reduces tissue drug levels during the critical period of incision and reduces efficacy in preventing surgical site infection. A single preoperative dose is usually sufficient; redosing may be required for prolonged procedures or significant blood loss.

• A. Administering the antibiotic after wound closure provides no benefit, as the period of contamination risk has already passed.
• C. Giving the antibiotic exactly at incision does not allow time for adequate tissue concentrations to be established.
• D. Dosing 6 hours preoperatively results in subtherapeutic drug levels at the time of incision due to the antibiotic's half-life.
• E. Prophylaxis should be given regardless of drain insertion; it is not dependent on the presence of a drain.

Rogers v Whitaker established that a doctor has a duty to disclose a 'material risk', defined as one that a reasonable person in the patient's position would attach significance to, or one that the doctor knows or should know this particular patient would consider significant, regardless of its statistical rarity. Because this patient has specifically disclosed that any risk to her hand or arm function is of unique importance to her professional life, the surgeon must address this subjective concern directly, even though it is not a standard risk of cholecystectomy. This reflects a patient-centred rather than purely practitioner-centred standard of disclosure. Failure to do so could constitute a breach of the duty of care regarding informed consent.

• A. Informed consent must be obtained before the procedure; deferring disclosure until after surgery defeats the purpose of informed consent.
• B. This describes the older Bolam standard based on peer professional practice, which Rogers v Whitaker specifically rejected for risk disclosure.
• D. This ignores the subjective component of materiality recognised in Rogers v Whitaker, which requires disclosure of risks known to be significant to this particular patient.
• E. Materiality is not defined by a fixed statistical threshold; even rare risks must be disclosed if significant to the reasonable patient or this particular patient.

This presentation describes a complete wound dehiscence with evisceration, a surgical emergency. Immediate management involves covering the exposed bowel with saline-soaked sterile gauze to prevent desiccation and contamination, keeping the patient nil by mouth in anticipation of surgery, providing intravenous fluids and analgesia, and arranging urgent return to theatre for fascial repair. Risk factors in this patient include diabetes, obesity, emergency surgery and raised intra-abdominal pressure from coughing. Attempting to reduce the bowel at the bedside or managing conservatively risks bowel strangulation, ischaemia and overwhelming peritoneal contamination.

• A. An abdominal binder alone does not address exposed bowel and continuing oral intake increases aspiration and intra-abdominal pressure risks; this requires surgical repair.
• B. Manual reduction at the bedside risks bowel injury, contamination and strangulation and is not an acceptable alternative to formal surgical closure.
• C. Discharge is entirely inappropriate for an acute surgical emergency with exposed bowel.
• E. Antibiotics alone do not address the mechanical defect and exposed bowel; delaying surgical repair risks bowel ischaemia and peritonitis.

Patients with a history of acute rheumatic fever and established rheumatic heart disease, including after valve surgery, require long-term secondary antibiotic prophylaxis with intramuscular benzathine benzylpenicillin every 4 weeks (more frequently in some high-risk settings) to prevent recurrent group A streptococcal infection and further valvular damage. Given her severe valve disease requiring surgery, prophylaxis should continue for at least 10 years after the last episode of acute rheumatic fever or until age 35, whichever is longer, and often lifelong in severe cases. Aboriginal and Torres Strait Islander communities, particularly in northern and central Australia, have among the highest rates of rheumatic heart disease in the world, making register-based recall and culturally appropriate delivery of prophylaxis essential. Valve surgery treats the structural consequence of disease but does not eliminate the ongoing risk of streptococcal reinfection and recurrent carditis.

• A. Valve surgery corrects the structural damage but does not prevent recurrent streptococcal infection and further rheumatic carditis, so prophylaxis must continue.
• C. Oral antibiotics have poor adherence and lower efficacy compared with intramuscular benzathine benzylpenicillin for secondary prophylaxis, and 12 months is far too short a duration.
• D. Dental review is important for endocarditis prevention but does not substitute for secondary antibiotic prophylaxis against recurrent rheumatic fever.
• E. Prophylaxis must be continuous and scheduled, not reactive to symptomatic sore throats, because streptococcal infection triggering recurrence can be subclinical.

Culturally safe and effective discharge planning for Aboriginal and Torres Strait Islander patients returning to remote communities requires early involvement of the Aboriginal Liaison Officer or Aboriginal Health Worker, coordination with the local Aboriginal Community Controlled Health Service or outreach services, and practical arrangements for follow-up such as telehealth review, transport and equipment. This recognises both the clinical need for structured follow-up of his fracture and the importance of supporting his connection to family, community and cultural obligations rather than defaulting to prolonged hospitalisation or relocation. A written exercise sheet alone and a single distant outpatient appointment do not adequately address the access barriers of distance and limited local allied health services. Discharge planning should be individualised, address health literacy and language needs, and involve the patient and family in decision-making.

• A. Assuming self-management without follow-up risks poor fracture outcomes and ignores the duty to arrange appropriate care.
• B. Transferring him to residential aged care is inappropriate, disproportionate and disregards his wish and right to return to his community with appropriate support.
• C. Prolonging hospitalisation against the patient's wishes disregards patient autonomy and the importance of family and cultural connection, and is not necessary if appropriate community-based follow-up can be arranged.
• D. A generic handout and single distant appointment does not adequately bridge the gap created by limited local services and long travel distances.