General Pathology Practice Questions

Q: Fat necrosis is most commonly associated with which of the following?

Retroperitoneal fat. ***Correct: Retroperitoneal fat*** - **Fat necrosis is most commonly associated with acute pancreatitis**, where activated pancreatic enzymes (lipases) leak into surrounding tissues and digest retroperitoneal and peripancreatic fat - This is termed **enzymatic fat necrosis** or **steatonecrosis**, characterized by the formation of **calcium soaps (saponification)** - a pathognomonic feature - Clinically presents with elevated amylase/lipase, severe epigastric pain radiating to the back, and **Cullen's sign** (periumbilical ecchymosis) or **Grey Turner's sign** (flank ecchymosis) in severe cases - This is the **classic and most frequently cited example** of fat necrosis in pathology textbooks and medical education *Incorrect: Breast tissue* - Fat necrosis does occur in breast tissue, typically following **trauma, surgery, biopsy, or radiation therapy** - Presents as a **painless lump** that can mimic breast cancer on clinical examination and imaging - While common in breast pathology, it is **not the most common cause of fat necrosis overall** when considering systemic pathology - Important differential diagnosis in breast lumps *Incorrect: Omental fat* - Fat necrosis can occur in omental fat, particularly in **omental infarction** or **omental torsion** - Presents with acute abdominal pain and may require surgical intervention - However, this is a relatively **rare condition** compared to pancreatic fat necrosis *Incorrect: None of the options* - This is incorrect because retroperitoneal fat (in the context of acute pancreatitis) is the correct and most common association with fat necrosis

Q: Which of the following is NOT a component of Virchow's triad?

Hypotension. ***Hypotension*** - **Hypotension** (low blood pressure) is not a component of Virchow's triad for thrombosis - While hypotension can affect blood flow, it is not one of the classic three factors described by Rudolf Virchow - Virchow's triad specifically consists of: endothelial injury, stasis/abnormal blood flow, and hypercoagulability *Endothelial injury* - Damage to the **blood vessel wall lining** is a key component of Virchow's triad - Causes include trauma, surgery, inflammation, atherosclerosis, and medical devices (catheters, stents) - Exposed subendothelial collagen triggers platelet adhesion and activation of the coagulation cascade *Stasis* - **Abnormal or stagnant blood flow** is the second component of Virchow's triad - Occurs in prolonged immobility, atrial fibrillation, venous obstruction, or varicose veins - Slow flow prevents dilution of activated clotting factors and allows platelet-endothelial interaction *Hypercoagulability* - **Increased tendency to form blood clots** is the third component of Virchow's triad - Can be inherited (Factor V Leiden, Prothrombin G20210A mutation, Protein C/S deficiency) or acquired - Acquired causes include malignancy, pregnancy, oral contraceptives, smoking, and nephrotic syndrome

Q: Liquefactive necrosis is seen in:

Brain. ***Brain*** - **Liquefactive necrosis** primarily occurs in the **brain** due to the high fat content and the process of enzymatic degradation of tissue after a cerebral infarction [1]. - This type of necrosis results in the transformation of tissue into a liquid viscous mass, often observed during **abscess formation** or ischemic damage [1]. *Spleen* - Commonly undergoes **caseous necrosis** in conditions like tuberculosis, not liquefactive necrosis. - **Hematopoietic tissue** destruction can occur, but it generally results in a differing necrotic pattern. *Heart* - Typically exhibits **coagulative necrosis** following myocardial infarction due to ischemic damage. - This results in the preservation of tissue architecture, differing from the liquid consistency seen in liquefactive necrosis. *Lungs* - Usually experiences **caseous necrosis** in the context of pulmonary tuberculosis, or **hemorrhagic necrosis** after certain infections, but not liquefactive necrosis. - The predominant necrotic process in the lungs is often related to **inflammatory responses** rather than liquefactive changes. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1268-1269.

Q: Caseating necrosis most commonly occurs in

Lung. ***lung*** - **Caseating necrosis** is classically associated with **tuberculosis**, which primarily affects the lungs [1]. - It is characterized by the presence of **granulomatous inflammation**, often leading to the formation of cavities in pulmonary tissue. *Brain* - While certain infections can lead to necrosis in the brain, they typically do not present as **caseating necrosis**, which is specific to certain conditions like tuberculosis. - The brain may show **liquefactive necrosis** or other types of necrosis, rather than **caseation**. *liver* - The liver usually shows **macrovesicular steatosis** or **apoptosis** in conditions like hepatitis, not caseating necrosis. - **Granulomatous hepatitis** can occur, but it does not typically result in **caseating** type necrosis associated with lung pathology. *kidney* - The kidneys can experience necrosis from various causes, but caseating necrosis is not typical; they are more often involved in **focal segmental glomerulosclerosis** or **acute tubular necrosis**. - Chronic kidney conditions may involve granulomas, but they usually are not characterized by **caseation** similar to that seen in pulmonary tissue. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 55.

Q: Reversible change from one cell type to another is known as -

Metaplasia. ***Metaplesia*** - Refers to the **reversible change** from one cell type to another in response to chronic irritation or damage [1][2]. - It often occurs as an adaptive response in **epithelial tissues**, such as in the respiratory tract in smokers [1][2]. *Hypertrophy* - Represents an **increase in cell size** rather than a change in cell type [2]. - It is often a response to increased functional demand, as seen in **cardiac muscle** in athletes. *Hyperplesia* - Refers to an **increase in cell number** within a tissue or organ, not a change in cell type [2]. - Common in conditions such as **benign prostatic hyperplasia** but does not involve differentiation into other cell types. *Dysplasia* - Indicates an **abnormal growth or development** of cells, leading to disordered morphology rather than a transformation into another cell type. - It is often a precursor to cancer but does not signify the reversible nature of metaplasia. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 49. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 85-92.

Question 1

Which of the following is not an apoptotic gene?

Accepted Answer

n-myc (oncogene)

Answer

Mcl-1

Answer

Bax

Answer

P53

Question 2

Fat necrosis is most commonly associated with which of the following?

Accepted Answer

Retroperitoneal fat

Answer

Breast tissue

Answer

Omental fat

Answer

None of the options

Question 3

Which of the following is NOT a component of Virchow's triad?

Accepted Answer

Hypotension

Answer

Endothelial injury

Answer

Stasis

Answer

Hypercoagulability

Question 4

Which of the following proteins serves as the PRIMARY executioner in the apoptotic pathway by directly cleaving cellular substrates?

Accepted Answer

Caspases

Answer

Cytochrome C

Answer

Apaf-1

Answer

Bcl-2

Question 5

Which molecule is primarily responsible for nuclear fragmentation during apoptosis?

Accepted Answer

Caspases

Answer

Apaf - 1

Answer

Oxygen free radicals

Answer

Endonuclease G

Question 6

Liquefactive necrosis is seen in:

Accepted Answer

Brain

Answer

Cardiac tissue

Answer

Pulmonary tissue

Answer

Splenic tissue

Question 7

Caseating necrosis most commonly occurs in

Accepted Answer

Lung

Answer

Brain

Answer

Liver

Answer

Kidney

Question 8

Reversible change from one cell type to another is known as -

Accepted Answer

Metaplasia

Answer

Hypertrophy

Answer

Dysplasia

Answer

Hyperplasia

Question 9

Which type of necrosis is most commonly associated with the spread of infection?

Accepted Answer

Liquefactive necrosis

Answer

Fibrinoid necrosis

Answer

Fat necrosis

Answer

Coagulative necrosis

Question 10

Hypertrophy is -

Accepted Answer

Increase in cell size

Answer

Increase in cell number

Answer

Decrease in cell number

Answer

Decrease in cell size

General Pathology — MCQs

General Pathology — MCQs

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