PLAB 1 (UKMLA AKT) surgery questions

Classic acute appendicitis presents with periumbilical pain that migrates to the right iliac fossa as localised peritoneal inflammation develops, with tenderness maximal at McBurney's point. Low-grade fever, anorexia and vomiting support the diagnosis, which is clinical in a typical presentation. The migratory pattern reflects visceral pain from appendiceal luminal obstruction followed by somatic pain from parietal peritoneal irritation. This history and examination are the textbook picture of appendicitis and require no further confirmation before surgical referral in a clear-cut case.

• B. Ureteric colic causes severe colicky loin-to-groin pain, not a gradual migratory pattern with localised peritonism.
• C. Mesenteric adenitis typically follows a viral illness and causes more diffuse, less localised tenderness without true migration of pain.
• D. Caecal diverticulitis is uncommon and does not typically produce the classic periumbilical-to-right iliac fossa migration seen here.
• E. Meckel's diverticulitis is rare in this age group and cannot be distinguished clinically from appendicitis, but appendicitis is far more common and fits the classic migratory pattern.

In women of reproductive age with equivocal right iliac fossa pain, ultrasound is the first-line investigation because it can identify gynaecological causes such as ovarian cyst rupture or torsion, ectopic pregnancy, or tubo-ovarian pathology, as well as sometimes visualising a thickened, non-compressible appendix. It is radiation-free, widely available and avoids unnecessary surgery when a gynaecological cause is found. CT is reserved for cases that remain unclear after ultrasound, particularly in older patients, because of radiation exposure concerns in younger women.

• A. CA-125 is a tumour marker with poor specificity in acute presentations and is not used to diagnose appendicitis or acute gynaecological emergencies.
• B. Diagnostic laparoscopy is invasive and is used when imaging has not clarified the diagnosis or when clinical suspicion remains high despite equivocal findings, not as the first test.
• C. Plain abdominal X-ray has very limited sensitivity for appendicitis and is not recommended in this setting.
• E. Erect chest X-ray looks for subdiaphragmatic free air from a perforated viscus, which is not suspected here.

Acute cholecystitis is characterised by persistent (not colicky) right upper quadrant pain lasting more than a few hours, fever, and a positive Murphy's sign, which results from gallbladder wall inflammation causing localised peritonism on inspiration. Biliary colic, in contrast, is typically self-limiting, lasts under 6 hours and is not associated with fever or a positive Murphy's sign. The combination of systemic inflammatory signs with Murphy's sign distinguishes cholecystitis from simple biliary colic.

• A. Choledocholithiasis refers to a stone in the common bile duct and typically causes jaundice with obstructive biochemistry, not featured in this case.
• C. Biliary colic is typically transient, resolving within a few hours, and does not cause fever or a positive Murphy's sign as seen here.
• D. Acute cholangitis requires biliary obstruction with infection, classically presenting with Charcot's triad of fever, jaundice and right upper quadrant pain, which is not described here.
• E. Acute pancreatitis causes epigastric pain radiating to the back with markedly raised amylase or lipase, not right upper quadrant pain with Murphy's sign.

This patient has Charcot's triad (fever, jaundice, right upper quadrant pain) with signs of septic shock and altered mental status, consistent with ascending cholangitis complicated by sepsis. The immediate priority is resuscitation following the Resuscitation Council UK sepsis six bundle: oxygen, blood cultures, intravenous antibiotics, intravenous fluids, lactate measurement and urine output monitoring, all within the first hour. Biliary drainage via ERCP is definitive treatment but is performed once the patient is resuscitated and stabilised, not as the very first step.

• B. Oral antibiotics and outpatient management are entirely inappropriate for a patient with septic shock requiring urgent inpatient resuscitation.
• C. ERCP is the definitive treatment for biliary decompression but must follow initial resuscitation; it is not performed before stabilising a septic, hypotensive patient.
• D. Analgesia alone does not address the underlying sepsis and biliary obstruction and would be dangerously inadequate.
• E. Cholecystectomy is not the treatment for cholangitis and would not be appropriate in an acutely septic, haemodynamically unstable patient.

Acute pancreatitis is diagnosed when two of three criteria are met: typical epigastric pain radiating to the back, serum amylase or lipase more than three times the upper limit of normal, and characteristic findings on imaging. This patient has classic pain and a markedly elevated lipase, so the diagnosis is already confirmed without needing imaging. Contrast CT is reserved for diagnostic uncertainty, suspected complications, or if the patient fails to improve, and is typically delayed 72-96 hours to assess necrosis rather than performed acutely for diagnosis.

• A. Plain X-ray has poor sensitivity and specificity for pancreatitis and is not a diagnostic criterion.
• C. MRCP is used to look for choledocholithiasis if obstruction is suspected, not as a routine step to confirm pancreatitis itself.
• D. Ultrasound is useful for identifying gallstones as the cause but is not needed to confirm the diagnosis when biochemical criteria are already satisfied.
• E. CT is not required for diagnosis when clinical and biochemical criteria are already met, and early CT is usually unhelpful for identifying necrosis.

The sudden onset of severe pain with a rigid, board-like abdomen in a patient on long-term NSAIDs strongly suggests a perforated peptic ulcer. An erect chest X-ray can show free air under the diaphragm, confirming pneumoperitoneum, and is a quick, widely available bedside test that supports urgent surgical referral. NSAIDs impair gastric mucosal protection by inhibiting prostaglandin synthesis, predisposing to ulceration and perforation. Although CT is more sensitive for detecting smaller amounts of free air, an erect chest X-ray remains a rapid first-line test in this acute setting.

• B. Serum lipase would be raised in pancreatitis, not specifically in perforation, and would not confirm this diagnosis.
• C. Barium studies are contraindicated in suspected perforation because of the risk of barium leaking into the peritoneal cavity.
• D. Ultrasound is not reliable for detecting free intraperitoneal air and is not the investigation of choice for suspected perforation.
• E. A supine film does not allow free air to rise beneath the diaphragm and is far less sensitive than an erect view for detecting pneumoperitoneum.

Uncomplicated diverticulitis (no abscess, perforation, peritonitis or sepsis) in a patient who is systemically well and tolerating oral intake can be managed in the community with oral antibiotics, simple analgesia and a temporary low-fibre diet until symptoms improve, after which fibre intake is gradually increased. Hospital admission and intravenous antibiotics are reserved for patients with signs of complicated disease, sepsis, or inability to tolerate oral intake. Surgery is reserved for complicated diverticulitis such as perforation, large abscess unresponsive to drainage, or recurrent episodes with complications. Routine percutaneous drainage is not indicated as there is no abscess on imaging.

• A. There is no abscess to drain on imaging.
• B. A high-fibre diet should be delayed until the acute episode has settled, not started immediately.
• D. Admission and IV antibiotics are unnecessary as she is systemically well and tolerating oral intake.
• E. Surgery is not indicated for uncomplicated disease without perforation or abscess.

A ruptured abdominal aortic aneurysm presenting with hypotension and a pulsatile abdominal mass is a surgical emergency; the diagnosis is clinical and the priority is immediate transfer to theatre rather than further imaging. Permissive hypotension (keeping systolic blood pressure around 80-90 mmHg) is used en route to avoid dislodging a clot that is temporarily tamponading the rupture, while still maintaining organ perfusion. Aggressive fluid resuscitation to normal blood pressure can worsen bleeding by disrupting this clot and is avoided. Imaging and invasive monitoring cause dangerous delay in a haemodynamically unstable patient with a classic presentation.

• A. CT delays definitive treatment and is unnecessary when the clinical picture is diagnostic; it is only appropriate if the patient is stable.
• B. This delays life-saving transfer to theatre and adds no benefit when the diagnosis is already clear clinically.
• D. Invasive monitoring causes unacceptable delay in an unstable patient needing immediate surgery.
• E. Normalising blood pressure can precipitate further haemorrhage by disrupting the tamponading clot.

Adhesions from previous abdominal or pelvic surgery are the most common cause of small bowel obstruction in developed countries, as fibrous bands form between loops of bowel and the peritoneum or abdominal wall, kinking or compressing the lumen. The history of prior open hysterectomy combined with central colicky pain, distension, vomiting and small bowel dilatation with valvulae conniventes on X-ray strongly supports this mechanism. Most adhesional obstructions are managed initially with nasogastric decompression, intravenous fluids and observation, with surgery reserved for failure to improve or signs of strangulation. Hernia and malignancy are also causes of obstruction but are less likely given the absence of a palpable groin lump and the surgical history pointing to adhesions.

• A. There is no mention of a groin lump or femoral hernia findings, and this is not the most common cause in a patient with prior abdominal surgery.
• B. A sigmoid carcinoma would more typically cause large bowel obstruction with a more gradual onset and change in bowel habit.
• D. Caecal volvulus typically shows a distended caecum on X-ray, not diffuse central small bowel loops.
• E. There is no history suggestive of inflammatory bowel disease, and adhesions are far more likely given her surgical history.

An irreducible, tender, erythematous groin lump with systemic signs of obstruction (vomiting, distension, tachycardia) indicates a strangulated inguinal hernia, where the blood supply to the herniated bowel is compromised and bowel necrosis is likely. This is a surgical emergency requiring prompt resuscitation with intravenous fluids and analgesia, followed by urgent surgical exploration to assess bowel viability and perform hernia repair, as any delay risks bowel perforation and peritonitis. Attempts at forceful manual reduction are avoided once strangulation is suspected because this can push non-viable or perforated bowel back into the abdomen, causing reduction en masse and masking ongoing ischaemia. Conservative measures such as ice, laxatives, or elective outpatient management are inappropriate and dangerous given the signs of strangulation.

• A. Outpatient imaging delays treatment unacceptably when strangulation is clinically evident.
• B. Ice and elevation have no role in a strangulated hernia and would dangerously delay emergency surgery.
• C. Laxatives are inappropriate and do not address the vascular compromise of strangulated bowel.
• D. Manual reduction risks reducing non-viable bowel into the abdomen and delays definitive treatment of strangulation.

A femoral hernia characteristically presents as a lump located below and lateral to the pubic tubercle, as the femoral canal lies lateral to the pubic tubercle and inferior to the inguinal ligament, whereas both direct and indirect inguinal hernias emerge above and medial to the pubic tubercle. Femoral hernias are more common in women, often present acutely due to their narrow neck predisposing to strangulation, and frequently lack a clear cough impulse because of this tight neck. Given the anatomical location and acute tenderness in an elderly woman, femoral hernia with possible early strangulation is the most likely diagnosis and warrants urgent surgical assessment. Inguinal hernias, by contrast, would present above and medial to the pubic tubercle.

• A. A saphena varix is a dilatation of the saphenous vein at the saphenofemoral junction, which typically disappears on lying flat and shows a bluish tinge, not a firm tender lump.
• B. Direct inguinal hernias also emerge above and medial to the pubic tubercle through a weakness in the posterior inguinal wall.
• C. Lymphadenopathy would usually be associated with a source of infection or systemic illness and does not typically present with the sudden tenderness described here in this location.
• E. Indirect inguinal hernias arise above and medial to the pubic tubercle, through the deep inguinal ring, not below and lateral to it.

Gallstone ileus occurs when a large gallstone erodes through the gallbladder wall into an adjacent viscus, most commonly the duodenum, forming a cholecystoenteric (usually cholecystoduodenal) fistula. The stone then passes through the bowel lumen and lodges at the narrowest point, typically the terminal ileum, causing mechanical small bowel obstruction. The fistula also allows air to enter the biliary tree, producing the characteristic finding of pneumobilia on imaging, alongside signs of small bowel obstruction (Rigler's triad: pneumobilia, SBO, ectopic gallstone).

• A. Cholangitis causes sepsis and jaundice, not a discrete mechanical obstruction with pneumobilia from a fistula.
• B. Pancreatitis causes a generalised, patchy ileus rather than a mechanical obstruction with pneumobilia and an ectopic stone.
• C. A CBD stone at the ampulla causes obstructive jaundice and pancreatitis, not small bowel obstruction with pneumobilia.
• E. External duodenal compression from cholecystitis does not explain pneumobilia or a calcified density within the ileum.

Postoperative paralytic ileus is common after abdominal surgery and presents with absent bowel sounds, distension and failure to pass flatus/stool in a patient who is otherwise stable without peritonism. Hypokalaemia is a recognised contributing factor as it impairs smooth muscle contractility, so correcting electrolyte imbalances is essential alongside supportive measures such as bowel rest, adequate analgesia (minimising opioids), and intravenous fluids. Imaging or surgical intervention is reserved for cases where mechanical obstruction is suspected or there are signs of ischaemia/perforation, neither of which is present here.

• A. Sigmoidoscopy decompression is used for sigmoid volvulus or Ogilvie's syndrome, not simple postoperative ileus.
• B. There are no signs of mechanical obstruction, ischaemia or perforation to warrant emergency laparotomy.
• C. CT is reserved for suspected mechanical obstruction or complications, not for a straightforward case of paralytic ileus with a clear reversible cause.
• D. Neostigmine is used for acute colonic pseudo-obstruction (Ogilvie's syndrome) confirmed on imaging, not routine postoperative ileus.

Ulcerative colitis characteristically causes continuous, confluent mucosal inflammation that always involves the rectum and extends proximally without skip lesions, confined to the colon, which fits with toxic megacolon (a recognised complication of severe UC). Crohn's disease, by contrast, typically shows skip lesions, transmural inflammation with granulomas, cobblestoning and perianal disease, and can affect any part of the gastrointestinal tract from mouth to anus. Toxic megacolon is a surgical emergency that can occur in severe colitis of either type but is classically associated with UC due to the continuous colonic involvement.

• A. Granulomas on biopsy are a histological feature of Crohn's disease, not ulcerative colitis.
• B. Skip lesions with intervening normal bowel are typical of Crohn's disease, not ulcerative colitis.
• C. Perianal fistulae are a hallmark of Crohn's disease, not ulcerative colitis.
• D. Cobblestone mucosa reflects transmural oedema and fissuring ulcers seen in Crohn's disease, not UC.

This man has grade II internal haemorrhoids (prolapse on straining with spontaneous reduction) that have failed conservative measures such as dietary and fluid modification. Rubber band ligation is the first-line outpatient procedural treatment for grade I-III internal haemorrhoids that do not respond to conservative management, working by causing ischaemic necrosis and fibrosis of the haemorrhoidal tissue. Surgical options such as haemorrhoidectomy or stapled haemorrhoidopexy are reserved for higher-grade haemorrhoids (grade III-IV) or those failing banding.

• A. GTN ointment is first-line treatment for anal fissures, not haemorrhoids.
• C. Open haemorrhoidectomy is reserved for grade III-IV haemorrhoids or failure of less invasive measures, not first-line for grade II disease.
• D. Stapled haemorrhoidopexy is a surgical option typically reserved for higher-grade or recurrent haemorrhoids after simpler measures fail.
• E. Sclerotherapy is injected into the submucosa of the haemorrhoid itself, not the external anal sphincter, and is a second-line, less commonly used option in the UK.

This presentation is typical of an anal fissure, a linear tear usually located in the posterior midline, associated with pain on defecation and constipation. First-line pharmacological treatment after dietary and laxative measures to soften stool is topical glyceryl trinitrate (GTN) 0.4% ointment, which relaxes the internal anal sphincter by increasing nitric oxide-mediated smooth muscle relaxation, improving blood flow and promoting healing. Headache is a common side effect due to systemic vasodilation. Botulinum toxin is reserved for fissures that fail to respond to topical GTN.

• B. Oral calcium channel blockers such as nifedipine are a second-line topical alternative to GTN, used orally they are not standard first-line therapy.
• C. Simple analgesia may help symptomatically but does not address the underlying sphincter spasm or promote healing.
• D. Topical steroids have no proven role in the first-line management of anal fissures.
• E. Botulinum toxin is a second-line option used when topical GTN fails, not first-line.

A perianal abscess presenting as a fluctuant, tender, erythematous swelling with systemic signs of infection requires prompt incision and drainage, which is the definitive treatment and should not be delayed for antibiotics alone, as abscesses do not resolve without drainage. This is typically performed under general or regional anaesthesia in theatre to allow adequate examination, drainage and exploration for any underlying fistula-in-ano. Antibiotics alone are inadequate and may mask the clinical picture without resolving the collection.

• A. Aspiration under local anaesthetic is insufficient for adequate drainage of a perianal abscess and risks incomplete treatment.
• C. Antibiotics alone are inadequate for an abscess; drainage is required as the definitive treatment.
• D. Conservative management without drainage is inappropriate for an established abscess and risks progression to sepsis or fistula formation.
• E. MRI is reserved for complex or recurrent cases to assess for fistula tracts, not required before draining a straightforward abscess.

Pilonidal sinus disease results from ingrowing hair causing a chronic inflammatory tract in the natal cleft, typically in young men with coarse body hair, often exacerbated by prolonged sitting such as driving. Recurrent infections, as in this patient with two prior episodes, warrant referral for elective surgical excision of the sinus tract once the acute inflammation has settled, as repeated antibiotic courses alone do not address the underlying tract and risk ongoing recurrence. Acute abscesses require drainage first, but with no current fluctuance here, definitive elective management of the chronic sinus is appropriate.

• A. Repeated antibiotics without addressing the sinus tract will not prevent further recurrence.
• C. Laser hair removal may be a useful adjunct to reduce recurrence but is not definitive treatment on its own for an established symptomatic sinus.
• D. MRI is not routinely required for straightforward pilonidal sinus disease prior to surgical referral.
• E. There is no fluctuant collection currently requiring acute drainage; the issue is the chronic recurrent sinus itself.

Non-dysplastic Barrett's oesophagus confirmed on biopsy carries a small annual risk of progression to adenocarcinoma and requires endoscopic surveillance rather than treatment. Current guidance recommends surveillance endoscopy with quadrantic biopsies (Seattle protocol) every 3-5 years for non-dysplastic segments to detect dysplasia or early malignancy. Ablative or surgical treatment is reserved for confirmed high-grade dysplasia or early cancer. PPI therapy continues for symptom control but does not alter surveillance intervals or reverse metaplasia.

• A. CT imaging has no role in surveillance of non-dysplastic Barrett's oesophagus.
• B. PPI dose escalation does not change the surveillance requirement or reverse metaplasia.
• C. Ablation is indicated for dysplastic Barrett's, not non-dysplastic disease.
• E. Surgery is reserved for high-grade dysplasia or invasive cancer, not non-dysplastic metaplasia.

Progressive dysphagia to solids with weight loss in a patient over 55 with significant smoking and alcohol history is a red flag for oesophageal malignancy and meets NICE criteria for a suspected cancer pathway referral. Direct access upper GI endoscopy within 2 weeks allows direct visualisation and biopsy of any lesion, providing a definitive diagnosis. Delaying investigation with empirical PPI therapy or imaging risks delayed diagnosis of a potentially curable early cancer. Barium swallow may demonstrate a stricture but cannot provide tissue diagnosis and is not first-line when cancer is suspected.

• A. Barium swallow cannot provide histological diagnosis and is not the first-line investigation for suspected cancer.
• B. Chest X-ray does not adequately assess the oesophagus and is not the investigation of choice here.
• C. Dysphagia with weight loss and alarm features must not be managed by watchful waiting.
• E. Empirical PPI trial delays diagnosis and is inappropriate with red flag features of possible malignancy.

Transabdominal ultrasound is the first-line investigation for suspected biliary colic because it is non-invasive, widely available and highly sensitive for detecting gallstones within the gallbladder. It also allows assessment of gallbladder wall thickness and common bile duct diameter, helping to distinguish simple biliary colic from cholecystitis or choledocholithiasis. Biliary colic results from transient obstruction of the cystic duct by a gallstone, causing pain without systemic inflammatory response, as reflected by the normal temperature and white cell count here. Further imaging such as MRCP is reserved for cases where duct stones are suspected despite a normal ultrasound.

• A. CT is not sensitive for detecting gallstones, which are often radiolucent.
• B. HIDA scanning is used to assess gallbladder function or diagnose acute cholecystitis when ultrasound is equivocal, not as the first test.
• C. MRCP is reserved for suspected common bile duct stones when ultrasound findings are inconclusive, not as the initial test.
• E. ERCP is an invasive therapeutic and diagnostic procedure reserved for confirmed duct stones, not first-line imaging.

Painless obstructive jaundice with a palpable, non-tender gallbladder, known as Courvoisier's sign, is classically associated with malignant obstruction of the common bile duct, most commonly carcinoma of the head of the pancreas. The tumour compresses the distal bile duct, causing gradual gallbladder distension without the inflammation seen in gallstone disease. Pale stools and dark urine reflect obstructive jaundice with reduced bilirubin delivery to the gut and excess conjugated bilirubin excreted in urine. The combination of weight loss, painless jaundice and a palpable gallbladder should prompt urgent CT pancreas and consideration of a two-week wait pancreatic cancer referral.

• A. Common bile duct stones typically cause painful jaundice with a non-palpable gallbladder (Courvoisier's law).
• B. Primary sclerosing cholangitis causes jaundice but is not associated with a palpable gallbladder mass and more typically presents with pruritus and a fluctuating course.
• D. Acute cholecystitis typically causes severe pain and fever, and jaundice is uncommon.
• E. Viral hepatitis causes jaundice without a palpable gallbladder and is usually accompanied by malaise and deranged transaminases rather than a mass.

In suspected variceal haemorrhage, intravenous terlipressin should be started immediately, as it causes splanchnic vasoconstriction and reduces portal pressure, decreasing bleeding before endoscopic confirmation. Prophylactic broad-spectrum antibiotics are also recommended, as bacterial infection is common in cirrhotic patients with variceal bleeding and antibiotics reduce mortality and rebleeding rates. Endoscopy should follow once the patient is resuscitated, with band ligation as the definitive endoscopic treatment for oesophageal varices. Terlipressin and antibiotics together form the evidence-based initial pharmacological bundle recommended by current guidelines prior to endoscopic intervention.

• A. Antibiotics must be given alongside terlipressin to reduce infection-related mortality in cirrhotic patients with variceal bleeding.
• C. Octreotide is an alternative splanchnic vasoconstrictor but antibiotics must also be given; lactulose alone is insufficient acute management.
• D. PPIs are not indicated for variceal bleeding, and propranolol is contraindicated in acute bleeding as it can worsen hypotension.
• E. Tranexamic acid and vitamin K are not part of standard variceal bleed management and do not address portal hypertension.

A firm, irregular, fixed breast lump in a woman over 30 meets criteria for urgent (2-week wait) referral to a breast clinic for triple assessment. Triple assessment comprises clinical examination, imaging (mammography and/or ultrasound depending on age) and core needle biopsy or fine needle aspiration for cytology or histology, allowing a definitive diagnosis to be reached efficiently. Isolated imaging or reassurance in primary care is inappropriate given the suspicious clinical features, as it risks delaying diagnosis of malignancy. Specialist assessment ensures coordinated imaging and tissue sampling rather than fragmented primary care investigation.

• A. Imaging alone without clinical and pathological assessment is insufficient to characterise a suspicious lump, and mammography is best arranged as part of specialist triple assessment.
• B. Suspicious examination findings should not be managed with reassurance and delayed review.
• C. Tamoxifen is a treatment for confirmed oestrogen receptor-positive breast cancer, not an appropriate step before diagnosis.
• D. There are no signs of infection such as erythema, warmth or fluctuance to justify antibiotics.

A mobile, smooth, rubbery, well-circumscribed lump in a young woman, described classically as a 'breast mouse', is typical of a fibroadenoma, the most common benign breast lesion in women under 30 years. Ultrasound confirming a solid (not fluid-filled) homogeneous mass with smooth margins supports this over a cyst. Fibroadenomas arise from hyperplasia of a single breast lobule and are hormonally responsive but do not usually change in size acutely. Management in a young woman with concordant benign clinical and imaging features is often reassurance and conservative follow-up rather than excision.

• A. Invasive carcinoma is unlikely at this age and would typically be hard, irregular and fixed, with suspicious ultrasound features such as irregular margins or shadowing.
• B. Phyllodes tumours are rare, tend to occur in slightly older women, and often grow rapidly to a larger size than typical fibroadenomas.
• D. Fat necrosis typically follows trauma or surgery and often presents with a firm, sometimes tender mass with skin changes, not a smooth mobile lump.
• E. A cyst would appear anechoic (fluid-filled) with posterior acoustic enhancement on ultrasound, not a solid hypoechoic mass.

Lactational mastitis without a palpable fluctuant collection should be treated with continued breastfeeding or expressing from the affected side alongside oral antibiotics, as milk stasis is a key driver of mastitis and continuing to empty the breast promotes resolution. Flucloxacillin is first-line because Staphylococcus aureus is the most common causative organism; it is safe in breastfeeding. Stopping breastfeeding risks worsening milk stasis and does not benefit the infant, who is not harmed by continued feeding. Ultrasound and aspiration are reserved for cases where a fluctuant abscess is suspected, which is not described here.

• B. Stopping breastfeeding worsens milk stasis, which drives mastitis, and is not recommended; antibiotics plus continued feeding is preferred.
• C. Co-amoxiclav is not first-line here and breastfeeding should be continued, not stopped, during treatment.
• D. There is no fluctuant mass described, so there is no indication for urgent imaging before a trial of antibiotics.
• E. There is no fluctuant collection described, so aspiration is not yet indicated; oral antibiotics with continued feeding is first-line.

Paget's disease of the nipple presents with a unilateral, persistent, eczema-like rash confined to the nipple that fails to respond to topical steroids, as in this case. It represents an intraepidermal spread of underlying ductal carcinoma in situ or invasive carcinoma and requires a nipple punch or wedge biopsy for confirmation, along with mammography to assess for an underlying tumour even when no lump is palpable. Unlike true eczema, which usually affects both nipples and the surrounding areolar skin symmetrically, Paget's disease typically starts on the nipple itself and spreads outward. Any unilateral nipple eczema persisting despite treatment should be biopsied to exclude malignancy.

• A. Candidiasis causes a moist, macerated rash often with satellite lesions and typically responds to antifungal treatment.
• C. Contact dermatitis would usually improve with avoidance of the irritant and topical steroids, and often has a clear exposure history.
• D. Atopic eczema usually affects both breasts symmetrically and involves the areola, and typically responds to topical steroids.
• E. Psoriasis would usually show well-demarcated plaques with silvery scale and other typical sites of involvement, and does not characteristically start at the nipple alone.

A gradual onset of pain over days, associated with urinary symptoms and discharge, together with an intact cremasteric reflex, normal testicular position, and relief of pain with elevation (Prehn's sign), points to epididymo-orchitis rather than torsion. In sexually active young men this is most commonly due to Chlamydia trachomatis or Neisseria gonorrhoeae, so sexual history, urine/urethral swabs for chlamydia and gonorrhoea NAAT, and appropriate antibiotics (per local/BASHH guidance) are indicated. Torsion classically presents with sudden severe pain, a high-riding horizontal testis, and an absent cremasteric reflex, which are all absent here. The distinction matters because torsion requires emergency surgery while epididymo-orchitis is managed medically.

• B. Torsion presents with sudden severe pain, an absent cremasteric reflex and a high, horizontally-lying testis, none of which are present here.
• C. A testicular tumour usually presents as a painless lump rather than an acutely painful, tender swelling with urinary symptoms.
• D. A hydrocele is typically a painless, fluctuant swelling that transilluminates, not an acutely tender epididymis with systemic urinary symptoms.
• E. Appendage torsion typically causes a well-localised tender nodule at the upper pole of the testis in a prepubertal boy, not diffuse epididymal tenderness with urethral discharge.

The severe, colicky, unilateral loin-to-groin pain with microscopic haematuria and a patient who cannot lie still is classic for renal/ureteric colic caused by a stone. NICE guidance recommends non-contrast CT KUB as the first-line imaging investigation in adults with suspected renal colic, as it has high sensitivity and specificity for detecting stones of any composition and size, and can identify alternative diagnoses. Ultrasound is preferred first-line in pregnant women and children to avoid radiation, but CT KUB remains the gold standard in adults. Plain X-ray KUB cannot reliably detect radiolucent stones and has lower sensitivity overall.

• A. Plain X-ray misses radiolucent stones (e.g. uric acid) and has lower sensitivity than CT for detecting ureteric calculi.
• B. MRI is not routinely used for suspected renal colic; it is reserved for specific circumstances such as pregnancy when ultrasound is inconclusive.
• C. Intravenous urography has been largely superseded by CT KUB due to lower sensitivity and the need for contrast with associated risks.
• E. Ultrasound is less sensitive than CT for detecting ureteric stones, particularly smaller or mid-ureteric calculi, and is reserved as first-line mainly in pregnancy and children.

Stones smaller than 5 mm, particularly those in the distal ureter, have a high likelihood (around 80-90%) of passing spontaneously within 4-6 weeks, so conservative management with analgesia (NSAIDs where not contraindicated) and watchful waiting is appropriate, as recommended by NICE. An alpha-blocker such as tamsulosin can be offered to facilitate ureteric relaxation and increase the chance of spontaneous passage for distal stones of this size. This patient has no signs of infection, obstruction causing renal impairment, or intractable pain, so there is no indication for urgent intervention. Stones larger than 10 mm are much less likely to pass spontaneously and more often require active treatment such as lithotripsy or ureteroscopy.

• A. Emergency ureteroscopy is unnecessary in an uncomplicated case with good pain control and no signs of obstruction or sepsis.
• C. Stenting and elective lithotripsy are reserved for stones unlikely to pass spontaneously or causing complications, not a 4 mm uncomplicated distal stone.
• D. Percutaneous nephrolithotomy is reserved for large or complex renal stones, not a small distal ureteric stone.
• E. Shockwave lithotripsy is not required emergently for a small distal stone likely to pass spontaneously with conservative management.

After relief of acute urinary retention with a large residual volume (often over 1000 mL, as here), patients are at risk of post-obstructive diuresis, where the kidneys excrete the excess fluid and solutes retained during obstruction, producing large volumes of urine and risking dehydration and electrolyte disturbances such as hyponatraemia or hypokalaemia. Close monitoring of hourly urine output and serum electrolytes, with intravenous fluid replacement if output is excessive, is essential in the following 24-48 hours. Clamping the catheter is not recommended practice and does not prevent diuresis, which is a physiological renal response rather than caused by rapid decompression itself. The patient should remain catheterised until the underlying cause of retention is addressed and a trial without catheter is planned, not discharged immediately.

• B. Immediate discharge is inappropriate given the risk of post-obstructive diuresis and the need for further urological assessment.
• C. Clamping the catheter is not standard practice and does not prevent post-obstructive diuresis, which is a physiological kidney response.
• D. Removing the catheter immediately ignores the ongoing need for bladder drainage and monitoring; a trial without catheter is planned later, not immediately.
• E. Furosemide would worsen fluid and electrolyte losses in a patient already at risk of post-obstructive diuresis, rather than treat it.

5-alpha-reductase inhibitors such as finasteride block conversion of testosterone to dihydrotestosterone, shrinking the prostate over months and are preferred when the gland is significantly enlarged (typically over 30-40 g), as they reduce long-term risk of acute urinary retention and the need for surgery. Alpha-blockers relax smooth muscle and act faster but do not reduce prostate volume, making them less suited as monotherapy for a markedly enlarged gland. NICE guidance supports combination therapy with both classes when symptoms are severe and the prostate is enlarged with high risk of progression.

• B. Bicalutamide is an anti-androgen used in prostate cancer management, not standard therapy for benign prostatic hyperplasia.
• C. Oxybutynin is an antimuscarinic used for overactive bladder/storage symptoms, not for obstructive BPH symptoms.
• D. Tamsulosin relaxes bladder neck and prostatic smooth muscle but does not reduce gland size, so is less effective alone for a markedly enlarged prostate.
• E. Sildenafil is used for erectile dysfunction and has no established first-line role in BPH symptom control here.

Unexplained visible (macroscopic) haematuria in a person aged 45 or over without evidence of urinary infection meets NICE criteria for an urgent suspected cancer pathway referral (two-week wait) to exclude bladder or renal tract malignancy. Painless visible haematuria is a classic red-flag presentation of bladder cancer, particularly in older smokers. Investigation typically includes cystoscopy and upper tract imaging. Delaying referral risks late diagnosis of a potentially curable malignancy.

• A. Painless visible haematuria in a patient over 45 warrants urgent, not routine, referral under NICE guidance.
• B. While imaging is part of the urological work-up, the priority is urgent referral; primary care imaging should not delay the two-week wait referral.
• D. There is no evidence of urinary tract infection (no nitrites, no leucocytes, no dysuria), so empirical antibiotics are inappropriate.
• E. Visible haematuria in this age group requires urgent investigation, not watchful waiting.

Paraphimosis is a urological emergency caused by a retracted foreskin that cannot be reduced, creating a constricting band that impairs venous return and can progress to arterial compromise and necrosis if untreated. First-line management is manual reduction: applying firm, sustained circumferential compression to reduce oedema, then pushing the glans back through the foreskin while pulling the foreskin forward. If manual reduction fails, options such as aspiration, dorsal slit or circumcision are considered. Ice packs, osmotic agents (e.g. granulated sugar) or local anaesthetic gel may assist before attempting manual reduction.

• A. Topical steroids and discharge are inappropriate; this is an emergency requiring active reduction, and discharge risks ischaemic necrosis.
• B. Dorsal slit is reserved for cases where manual reduction fails, not as the initial step.
• C. Antibiotics are not first-line unless there is evidence of established infection or necrosis; the priority is mechanical reduction.
• D. Circumcision is a definitive elective procedure considered later, not the immediate emergency action.

This patient has acute limb ischaemia, likely embolic given his atrial fibrillation, presenting with several of the classic 6 Ps: pain, pallor, pulselessness, paraesthesia, paralysis and perishing cold. Sensory loss and motor weakness indicate a threatened limb requiring emergency vascular surgical assessment for revascularisation (embolectomy, thrombolysis or bypass) within hours to prevent irreversible tissue loss. Delay beyond this window risks amputation. Anticoagulation with heparin is started as a bridge but does not replace urgent surgical referral.

• B. Compression bandaging is contraindicated in ischaemia and elevation worsens arterial perfusion further.
• C. Routine outpatient imaging is far too slow for a limb with sensory and motor compromise.
• D. Aspirin alone and delayed review are inadequate; this is a surgical emergency requiring immediate specialist assessment.
• E. Heparin is appropriate as an adjunct but discharging the patient risks limb loss; urgent surgical referral is mandatory.

The ankle-brachial pressure index (ABPI) here is 84/140 = 0.6, which falls within the range of 0.5-0.9 indicating peripheral arterial disease, consistent with his history of intermittent claudication. An ABPI of 0.9-1.3 is normal, below 0.5 suggests critical ischaemia, and above 1.3 suggests arterial calcification giving a falsely elevated reading (common in diabetics) rather than a low one. This patient's clinical picture of exertional calf pain relieved by rest with risk factors of smoking and diabetes fits peripheral arterial disease causing intermittent claudication.

• A. A normal ABPI is 0.9-1.3; 0.6 is abnormal and indicates significant arterial disease.
• B. Acute occlusion presents with sudden severe ischaemic symptoms, not a 6-month history of exertional claudication.
• C. Venous insufficiency does not cause a reduced ABPI and presents with different features such as aching, oedema and skin changes, not exertional cramping relieved by rest.
• E. Calcification causes a falsely elevated (high) ABPI above 1.3, not a low reading of 0.6.

A two-level Wells score of 2 or more indicates that deep vein thrombosis (DVT) is 'likely', and NICE guidance recommends proceeding directly to a proximal leg vein ultrasound scan, ideally within 4 hours, rather than starting with a D-dimer test. If ultrasound cannot be performed within 4 hours, interim anticoagulation should be given and the scan arranged within 24 hours. D-dimer testing is reserved for patients in whom DVT is deemed 'unlikely' (Wells score 0-1) to help rule out the diagnosis. This patient's score of 3 places her in the 'likely' category, so imaging is the priority.

• A. CT pulmonary angiogram is used to investigate suspected pulmonary embolism, not to diagnose DVT.
• B. Her clinical picture and Wells score indicate a likely DVT requiring active investigation, not reassurance.
• C. D-dimer is used when DVT is 'unlikely' (Wells score 1 or below); with a score of 3, ultrasound is the appropriate first test.
• D. Anticoagulation should not be started empirically without imaging confirmation unless there is a delay in arranging the scan, in which case interim anticoagulation is given alongside planning for ultrasound, not instead of it.

The NHS AAA screening programme invites all men in their 65th year for a single abdominal ultrasound scan to measure aortic diameter, as abdominal aortic aneurysm is far more common in men and screening has been shown to reduce aneurysm-related mortality. Ultrasound is non-invasive, quick and highly sensitive for detecting infrarenal aortic dilatation (defined as diameter 3 cm or more). Men with a normal scan are not routinely rescreened, while those with an aneurysm enter a surveillance or referral pathway depending on size. Women are not routinely screened as the programme is targeted at the higher-risk population.

• A. There is no validated serum biomarker screening panel for AAA in current UK practice.
• B. MRI is not used for population screening due to cost, availability and scan time.
• C. Physical examination alone has poor sensitivity for detecting AAA and is not an adequate screening method.
• D. CT involves radiation and contrast and is reserved for further characterisation after an abnormal ultrasound, not as the primary screening tool.

The ulcer is painless, located over a pressure point (metatarsal head), punched-out with surrounding callus, and occurs in a warm foot with normal pulses and a normal ankle-brachial pressure index (0.9-1.2), all pointing to loss of protective sensation from peripheral neuropathy rather than ischaemia. Repetitive unnoticed trauma at pressure points causes painless skin breakdown with callus formation. Diabetic peripheral neuropathy is confirmed by absent monofilament sensation. Ischaemic ulcers are typically painful, occur at the toes or heel, and are associated with weak/absent pulses and a low ABPI.

• A. Ischaemic ulcers are painful, occur at acral sites, and are associated with weak pulses and a low ABPI, not normal pulses and ABPI of 1.1.
• C. Venous ulcers occur over the medial malleolus with associated venous eczema and lipodermatosclerosis, not the plantar forefoot.
• D. Pyoderma gangrenosum presents with painful, rapidly enlarging ulcers with violaceous undermined edges, often with associated inflammatory bowel disease.
• E. Marjolin ulcer is a squamous cell carcinoma arising in a chronic wound or scar, not an acute painless pressure ulcer.

NICE guidance (NG89) recommends that patients undergoing elective hip replacement who are at high VTE risk and low bleeding risk receive combined mechanical and pharmacological prophylaxis. Low molecular weight heparin is the pharmacological agent of choice for major orthopaedic surgery, started postoperatively and continued for up to 28-35 days, combined with anti-embolism stockings as mechanical prophylaxis. Mechanical prophylaxis alone is insufficient for this high-risk group. Unfractionated heparin is reserved mainly for patients with significant renal impairment because of its shorter half-life and easier reversibility.

• A. Intermittent pneumatic compression alone does not provide adequate prophylaxis in this high-risk elective hip replacement setting.
• B. Unfractionated heparin is not first-line in patients with normal renal function; low molecular weight heparin is preferred unless renal impairment is present.
• C. Aspirin alone is not recommended by NICE as first-line VTE prophylaxis after major joint replacement.
• E. Mechanical prophylaxis alone is inadequate for a high-risk patient undergoing major orthopaedic surgery; pharmacological prophylaxis is also needed.

The 'sign in' is performed before induction of anaesthesia and includes confirming patient identity, surgical site, procedure, consent, and checking that anaesthetic equipment and pulse oximetry are functioning correctly. The 'time out' occurs after induction but before skin incision, confirming team introductions, the planned procedure, antibiotic prophylaxis, and anticipated critical events. The 'sign out' takes place before the patient leaves theatre and involves confirming the procedure performed, instrument and swab counts, and specimen labelling. The checklist, introduced by the WHO and adopted by the NHS, is designed to reduce avoidable surgical errors through structured team communication at key transition points.

• B. Debrief is not a formal WHO checklist stage occurring before induction of anaesthesia.
• C. Team brief typically occurs before the start of the operating list, not as a patient-specific pre-induction check.
• D. Time out occurs after induction of anaesthesia and before skin incision, not before induction.
• E. Sign out occurs before the patient leaves the operating theatre, involving instrument counts and specimen labelling.

Postoperative fever follows a rough timeline: atelectasis typically occurs on days 1-2, urinary tract infection on days 3-5, and wound or surgical site infection on days 5-7 or later, often called the '5 Ws' framework (wind, water, wound, walking, wonder drugs). This patient is 6 days postoperative with a wound showing classic signs of infection, erythema, tenderness, and purulent discharge, with a clear chest and negative urine dipstick making atelectasis and urinary tract infection unlikely. Deep vein thrombosis is excluded by soft, non-tender calves, and an anastomotic leak would more typically present with abdominal pain, distension, tachycardia, and systemic signs of sepsis rather than localised wound findings.

• A. An anastomotic leak typically presents with abdominal pain, distension, and systemic sepsis rather than isolated wound erythema and discharge.
• B. Urinary tract infection typically presents on days 3-5 and is excluded here by a negative urine dipstick.
• D. Deep vein thrombosis is excluded by the soft, non-tender calves and does not explain the wound findings.
• E. Atelectasis typically presents on days 1-2 postoperatively with a clear or abnormal chest exam, not with wound discharge on day 6.

Epidural analgesia blocks sympathetic outflow, causing vasodilation and a fall in systemic vascular resistance, which produces hypotension typically accompanied by warm peripheries, a normal or only mildly elevated heart rate, and sensory or motor block, as seen in this patient's bilateral leg heaviness and reduced sensation. This is distinct from hypovolaemic shock from bleeding, which typically causes tachycardia and cool peripheries with evidence of significant blood loss. His normal temperature and respiratory rate, with no clear infective source only 4 hours after surgery, make sepsis unlikely, and there are no features of cardiac failure or an anaphylactic reaction such as rash, bronchospasm, or angioedema.

• A. Anaphylaxis would present with additional features such as rash, bronchospasm, or angioedema, none of which are described.
• B. Sepsis this early postoperatively without fever, tachycardia, or a clear infective source is unlikely.
• C. There are no features of cardiac failure such as raised jugular venous pressure, pulmonary oedema, or arrhythmia to suggest cardiogenic shock.
• E. Concealed haemorrhage typically causes tachycardia and cool peripheries, and the dressing shows minimal ooze with no other bleeding source suggested.

NICE guidance (NG125) on surgical site infection prevention recommends maintaining perioperative normothermia, as hypothermia impairs neutrophil function and wound healing, increasing infection risk. Hair removal, if needed, should be with clippers, not a razor, which causes microabrasions that increase bacterial colonisation. Prophylactic antibiotics should be given before incision, within 60 minutes, not after. Reasonable glycaemic control is beneficial, but surgery should not be delayed to an arbitrary strict target when the HbA1c is only moderately elevated and the procedure is not deferrable.

• A. An HbA1c of 58 mmol/mol does not mandate cancelling necessary surgery; optimisation is pursued without unnecessary delay.
• B. Antibiotics must be given before incision, not after, to achieve adequate tissue levels.
• C. Razors cause skin microtrauma and increase infection risk; clippers are preferred if hair removal is needed.
• E. Antibiotic prophylaxis should be given, not withheld, as resistance is managed through appropriate dosing and duration, not omission.

Pain out of proportion to the injury, worsened by passive stretch of the muscles within the compartment, is the earliest and most sensitive clinical sign of compartment syndrome. Pulses are often preserved until late, so their presence does not exclude the diagnosis. Diagnosis is confirmed by measuring intracompartmental pressure, and management is emergency fasciotomy to prevent irreversible muscle and nerve ischaemia. Delaying for imaging or symptomatic measures risks limb loss.

• A. Doppler ultrasound is not the diagnostic test and delays urgent management.
• B. Escalating analgesia delays definitive treatment and masks a limb-threatening diagnosis.
• D. Elevation above heart level can reduce perfusion pressure and worsen compartment syndrome; ice does not address the underlying problem.
• E. MRI is too slow and is not required to diagnose this surgical emergency.

A pearly, translucent nodule with a rolled border and overlying telangiectasia is the classic appearance of basal cell carcinoma, the most common skin cancer, typically arising on sun-exposed sites such as the face in older adults. It grows slowly and rarely metastasises, in contrast to squamous cell carcinoma, which more often presents as a scaly, crusted, or ulcerated lesion with a tendency to invade locally and metastasise. Standard treatment is surgical excision with a 4-5 mm margin for low-risk lesions. Mohs micrographic surgery is reserved for high-risk sites such as the central face, where tissue conservation and margin control are critical.

• A. Actinic keratosis appears as a rough, scaly erythematous patch, not a pearly nodule with telangiectasia.
• B. Keratoacanthoma grows rapidly over weeks with a central keratin-filled crater, unlike this slow-growing pearly nodule.
• D. Seborrhoeic keratosis has a greasy, warty, stuck-on appearance and is benign, not matching this description.
• E. Squamous cell carcinoma more typically presents as a scaly, ulcerated or crusted lesion rather than a pearly nodule.

Breslow thickness, the depth of tumour invasion measured from the epidermal granular layer to the deepest tumour cell, is the single most important prognostic factor in cutaneous melanoma, correlating directly with risk of metastasis and overall survival. The ABCDE criteria (asymmetry, border irregularity, colour variation, diameter greater than 6 mm, evolution) are useful for clinical suspicion and prompting excision biopsy, but they do not predict prognosis once melanoma is confirmed histologically. Wider excision margins and consideration of sentinel lymph node biopsy are guided by the Breslow thickness.

• A. Border irregularity is a clinical feature used for diagnosis, not a prognostic measurement.
• B. Diameter contributes to clinical suspicion of melanoma but is not the key prognostic measurement after diagnosis.
• C. Colour variation raises diagnostic suspicion clinically but has no direct bearing on histological prognosis.
• D. Age can influence outcomes generally but is not the primary determinant of melanoma prognosis compared with tumour depth.

Pain out of proportion to clinical signs, rapidly progressing erythema, systemic toxicity, and haemorrhagic bullae in a patient with risk factors such as diabetes are highly suggestive of necrotising fasciitis, a surgical emergency. Urgent surgical debridement is the definitive treatment and should not be delayed for imaging, which can be unreliable and wastes critical time. Broad-spectrum intravenous antibiotics are also started promptly, but surgery is the priority intervention since mortality rises sharply with delayed debridement. Oral antibiotics or antibiotics alone are inadequate for this life-threatening diagnosis.

• A. Oral antibiotics and delayed review are grossly inadequate for a surgical emergency with systemic sepsis.
• B. Antibiotics alone, without surgical debridement, do not adequately treat necrotising fasciitis and delay definitive source control.
• D. Compression and elevation do not address the underlying necrotising infection and could worsen tissue compromise.
• E. Imaging should not delay surgical intervention when clinical suspicion for necrotising fasciitis is high.

A lipoma is a benign tumour of adipocytes presenting as a soft, mobile, non-tender subcutaneous lump that grows slowly and is not fixed to the skin or deeper structures. The absence of a central punctum helps distinguish it from an epidermoid (sebaceous) cyst, which arises from a blocked hair follicle, is typically firmer, and is attached to the overlying skin with a visible punctum. Dermatofibromas are firm, intradermal nodules that dimple on lateral compression, and ganglion cysts occur near joints or tendons, most often at the wrist. Abscesses are tender, erythematous, and fluctuant, reflecting an acute infective process rather than a slow-growing painless lump.

• A. Ganglion cysts occur near joints and tendons, typically at the wrist, not on the back.
• B. An abscess would be tender, warm, and erythematous, not painless and slow-growing.
• D. Dermatofibromas are firm and dimple on pinching, unlike the soft, doughy consistency described.
• E. Epidermoid cysts are typically firmer, attached to the skin, and have a visible central punctum, none of which are present here.

The Parkland formula calculates total fluid requirement in the first 24 hours as 4 mL × body weight (kg) × %TBSA burned, giving 4 × 80 × 40 = 12,800 mL for this patient. Half of this total volume is given over the first 8 hours from the time of the burn, not from the time of arrival, so the first-8-hour volume is 12,800 / 2 = 6400 mL. Because he presented 2 hours after the injury, this 6400 mL must be infused over the remaining 6 hours to complete the first 8-hour period on schedule. The remaining half of the total 24-hour volume is given over the subsequent 16 hours.

• B. This is three-quarters of the correct 8-hour volume, not the correct figure.
• C. This figure underestimates the correct 8-hour volume calculated from the Parkland formula.
• D. This is double the correct total 24-hour requirement and is too high.
• E. This equals the full 24-hour total, not the volume for the first 8 hours.