Pathological Anatomy Practice Tests with Answers: 50 Questions for Exam Preparation

Hereditary dystrophies (thesaurismoses) develop due to mutations in genes encoding enzymes, leading to their deficiency and the accumulation of uncleaved metabolites within cells.

In amyloidosis, the kidneys become firm, enlarged in volume, and acquire a characteristic lardaceous or waxy sheen on cut surface due to the deposition of amyloid along the basement membranes and in the stroma.

Wilson's disease (hepatolenticular degeneration) is characterized by a genetically determined copper metabolism disorder with its toxic accumulation predominantly in the liver tissue and basal ganglia of the brain.

Ethanol is the leading exogenous etiological factor of fatty liver dystrophy, impairing fatty acid oxidation and stimulating excessive triglyceride synthesis in hepatocytes.

Potassium is the primary intracellular ion, therefore the destruction of cell membranes and the breakdown of intracellular macromolecules lead to its massive release into the bloodstream.

Mucoid swelling is the initial and reversible stage of connective tissue disorganization, in which structural changes are detectable only at the microscopic level. Macroscopically, the external appearance and consistency of organs do not change during this stage.

It is believed that viral or bacterial antigens share structural similarity with muscle tissue proteins, leading to a cross-reaction of the immune system and damage to the body's own cells.

The development of acquired heart defects in systemic sclerosis is caused by fibrosis and sclerosis of the valve cusps, parietal endocardium, and chordae tendineae.

The pathogenesis of polymyositis is associated with a cellular immune response in which cytotoxic CD8+ T-lymphocytes infiltrate the endomysium and directly damage muscle fibers.

The outcome of any inflammatory and disorganizing process in the connective tissue of the valvular apparatus and chordae in rheumatic endocarditis is the proliferation of fibrous tissue with sclerosis, thickening, and shrinkage of structures, leading to the development of a heart defect.

Chronic venous congestion in the lesser circulation leads to erythrocyte diapedesis, hemosiderin accumulation in macrophages, and connective tissue proliferation, which macroscopically presents as brown induration of the lungs.

Classic polyarteritis nodosa is characterized by necrotizing inflammation of medium and small arteries without involvement of arterioles, capillaries, and venules, which rules out the development of glomerulonephritis.

Healing of focal inflammatory lesions in the renal glomeruli predictably leads to the development of focal segmental glomerulosclerosis.

Alport syndrome is caused by a genetic defect in the alpha chains of type IV collagen, which leads to impaired normal synthesis and assembly of the glomerular basement membrane with its subsequent splitting.

In diffuse glomerulosclerosis (e.g., diabetic nephropathy), there is excessive production of extracellular matrix. Mesangial cells first proliferate moderately and are then compressed and entrapped within the accumulating hyaline masses.

A pathognomonic morphological sign of Berger's disease is the deposition of immune complexes containing IgA precisely within the mesangial matrix of the renal glomeruli.

In renal amyloidosis, amyloid fibrils are initially deposited in the glomerular mesangium, and as the disease progresses, they spread beneath the endothelium and epithelium of the capillary loops.

Decreased tubular concentrating function leads to the inability to properly reabsorb water, resulting in the excretion of a large volume of unconcentrated urine.

In prolonged thyrotoxicosis, the adrenal cortex is in a state of functional exhaustion, so surgical stress can trigger acute adrenal insufficiency.

Waterhouse-Friderichsen syndrome is a massive bilateral adrenal hemorrhage leading to acute adrenal insufficiency, shock, and rapid death.

Malignant adrenocortical tumors typically reach large sizes, are characterized by invasive growth, and lack a well-defined connective tissue capsule. Benign adenomas, conversely, are encapsulated and small in size.

Pathognomonic for diabetic microangiopathy in the kidneys is the simultaneous involvement (hyalinosis) of both the afferent and efferent glomerular arterioles.

In the initial (acute) phase of de Quervain's thyroiditis, follicular destruction occurs with the release of colloid, triggering an acute inflammatory response with neutrophil infiltration and microabscess formation. Later, this appearance is replaced by classical granulomatous inflammation with multinucleated giant cells.

Leukemic cells primarily proliferate in the bone marrow, from where they are distributed throughout the body via the bloodstream, forming specific infiltrates in organs.

Secondary (therapy-related) myelodysplastic syndromes most commonly arise as a late complication of prior chemotherapy (alkylating agents, topoisomerase inhibitors) or radiation therapy for other oncological diseases.

The spleen normally sequesters and destroys a significant proportion of platelets; therefore, its removal (splenectomy) leads to a secondary (reactive) increase in their count in peripheral blood. Myeloproliferative disorders cause primary (clonal) thrombocytosis.

Poikilocytosis refers to the presence of abnormally shaped and varied red blood cells in the blood, which is characteristic of many types of anemia.

Mycosis fungoides is a cutaneous T-cell lymphoma that, upon progression, can undergo large-cell transformation to form an aggressive large-cell T-cell lymphoma.

Retraction clefts characteristic of basal cell carcinoma occur during histological processing due to weakened intercellular junctions (hemidesmosomes) between the tumor cells and the stroma.

The presence of cells with clear cytoplasm accumulating glycogen in the tumor is a characteristic histological feature of the clear cell variant of hidradenoma (eccrine acrospiroma).

The replacement of melanoma tissue with connective tissue showing pronounced lymphomacrophage infiltration and accumulation of melanophages is a morphological manifestation of spontaneous tumor regression driven by the immune system.

Ichthyosis vulgaris develops due to mutations in the FLG gene, leading to filaggrin deficiency, impaired keratinization, and decreased epidermal barrier function.

Dysplastic nevus is characterized by asymmetry and irregular growth, making the presence of a flat (macular) component with uneven, blurred edges typical.

Diphtheria exotoxin causes demyelination of nerve fibers, including the vagus nerve, leading to severe autonomic dysfunction and fatal arrhythmias during convalescence.

Congenital cytomegalovirus infection is transmitted strictly from mother to fetus, whereas the sexual route of transmission occurs exclusively in the acquired form of the disease in adults.

Late cardiac complications of diphtheria are associated with toxic polyneuropathy affecting the vagus nerve and cardiac intramural ganglia. This leads to severe rhythm disorders and heart failure.

The measles virus causes fusion of infected lymphoid cells, leading to the formation of specific Warthin–Finkeldey giant multinucleated cells in the lymph nodes and other organs of the immune system.

Late complications of scarlet fever are caused by a cross-reactive autoimmune response to group A beta-hemolytic streptococcus antigens, leading to involvement of the heart (endomyocarditis), kidneys (glomerulonephritis), and joints.

Perianal abscesses are most commonly caused by non-specific intestinal microflora penetrating through the damaged mucous membrane, with Escherichia coli and anaerobes playing the leading role.

Autoimmune gastritis affects the body and fundus of the stomach, leading to the destruction of parietal cells and achlorhydria. The reduction in acidity stimulates G-cells of the intact antral region via a feedback mechanism, causing their reactive hyperplasia and hypergastrinemia.

Normally, plasma cells in the lamina propria of mucous membranes (especially the gastrointestinal tract) predominantly synthesize secretory immunoglobulin A, which provides local immunity.

Severe dysplasia and carcinoma in situ (intraepithelial carcinoma) are morphologically and clinically grouped under the concept of high-grade intraepithelial neoplasia (High-Grade IN).

Chronification of an ulcer defect is caused by continuous damage and impaired microcirculation, which prevents the normal maturation of granulation tissue into a full-fledged scar. As a result, alteration processes prevail over regeneration.

When compensatory mechanisms are depleted, all structural elements of the organ are forced to function continuously. This leads to the disappearance of reserve structures that are in the rest phase and the loss of normal functional and morphological heterogeneity.

When a tumor, aneurysm, or fluid collection exerts pressure on tissue, blood vessels are compressed, leading to local ischemia, hypoxia, and subsequent reduction in cell volume.

Decompensation at the organ level depends not only on the depletion of intracellular reserves, but also on impaired systemic neurohumoral and hemodynamic regulation across the entire organism.

Dysfunctional atrophy develops as a result of a decrease or complete cessation of the functional load on an organ, for example, during limb immobilization or bed rest. Reduced functional activity leads to a decrease in the volume and number of tissue cells.

Mass BCG vaccination provided effective protection for young children, which shifted the greatest susceptibility to primary infection and the peak incidence to adolescence and youth, when post-vaccination immunity wanes.

The condition is regarded as incomplete recovery because the pathogen is eliminated and the underlying disease is resolved, but persistent structural defects remain that require compensation.

Lobar pneumonia is an independent nosological entity that, on its own or through its complications, led to the patient's death, and therefore is designated as the underlying disease.