General Pathology Practice Questions

Q: Which of the following is an example of an antiapoptotic gene?

FLIP. ***FLIP*** - **FLIP** is an **antiapoptotic gene** that inhibits the activation of caspase-8, thereby blocking the extrinsic apoptotic pathway. - It acts as an **FLICE-inhibitory protein**, preventing the formation of the death-inducing signaling complex (DISC) or its downstream activation. *P53* - **P53** is a **tumor suppressor gene** that promotes apoptosis in response to DNA damage or cellular stress. - It is a **pro-apoptotic gene**, orchestrating cell cycle arrest and apoptosis to prevent the propagation of damaged cells. *BAX* - **BAX** is a **pro-apoptotic gene** belonging to the Bcl-2 family, which promotes the release of cytochrome c from mitochondria. - This release initiates the **intrinsic apoptotic pathway**, leading to caspase activation and cell death. *BIM* - **BIM** is a **pro-apoptotic gene** of the Bcl-2 family, acting as a sensitizer for apoptosis by binding to and inhibiting anti-apoptotic Bcl-2 family proteins. - Its activation leads to the **neutralization of survival factors**, thereby promoting mitochondrial outer membrane permeabilization and apoptosis.

Q: Lines of Zahn are LEAST likely to be seen in -

Lung. ***Lung*** - **Lines of Zahn are LEAST likely in the lungs** because most pulmonary thrombi are actually **emboli that formed elsewhere** (typically in deep leg veins) and then **lodged in pulmonary vessels**. - These pre-formed thrombi developed in **low-flow venous environments** and therefore **lack the characteristic layered appearance** of Lines of Zahn. - Even when thrombi form in situ in pulmonary vessels, the vascular bed characteristics make Lines of Zahn formation less common compared to other sites. *Heart* - **Mural thrombi** in heart chambers (especially post-MI in left ventricle or in atrial fibrillation) commonly show **Lines of Zahn**. - The **high-flow, turbulent environment** with continuous cardiac contractions creates ideal conditions for alternating platelet-fibrin and RBC layer deposition. - These are classic examples of antemortem thrombi with visible Lines of Zahn. *Liver* - **Portal vein thrombosis** and **hepatic vein thrombosis** (Budd-Chiari syndrome) can exhibit **Lines of Zahn**. - Despite being venous, these vessels have **sufficient flow velocity and turbulence** to allow layered thrombus formation. - Lines of Zahn indicate the thrombus formed during life with flowing blood. *Kidney* - **Renal artery thrombosis** and **renal vein thrombosis** frequently show **Lines of Zahn**. - Both arterial and venous renal circulation have adequate flow dynamics for layered thrombus formation. - These represent antemortem thrombi formed in vessels with active blood flow.

Q: Hyaline degeneration is found in -

Alcoholic liver disease. ***Alcoholic liver disease*** - **Mallory bodies**, a form of hyaline degeneration, are characteristic histologic findings in hepatocytes in alcoholic liver disease. - They represent aggregates of **intermediate filaments** and other proteins, indicating severe hepatocellular damage. *Acute myocardial infarction* - Characterized by **coagulative necrosis** of cardiac myocytes due to ischemia, not hyaline degeneration. - Inflammation and subsequent repair with **fibrosis** are key features. *Alzheimer's disease* - Defined by the presence of **senile plaques** (amyloid-beta deposits) and **neurofibrillary tangles** (hyperphosphorylated tau protein). - These are specific protein aggregates, distinct from hyaline degeneration of cellular components. *Acute appendicitis* - Involves acute inflammation of the appendix, leading to **neutrophilic infiltration** and often **fibrinopurulent exudate**. - There is no characteristic hyaline degeneration associated with this inflammatory process.

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: What does Prussian blue staining specifically detect in histology?

Ferric iron. ***Ferric iron*** - The **Prussian blue reaction**, also known as Perls' stain, specifically identifies **ferric iron (Fe3+)** in tissue sections. - This stain is crucial for diagnosing conditions involving **iron overload**, such as hemochromatosis or hemosiderosis, by highlighting iron deposits as blue. *Ferrous iron* - The Prussian blue stain does **not react with ferrous iron (Fe2+)**; it specifically targets the ferric (oxidized) state of iron. - While ferrous iron is present in the body, it is not detected by this particular staining method for routine histological assessment of iron stores. *Glycogen* - **Glycogen** is a polysaccharide storage molecule and is typically stained using the **Periodic Acid-Schiff (PAS) stain**, which produces a magenta color. - Prussian blue staining is entirely unrelated to the detection of glycogen and would not highlight these molecules in tissue. *Lipids* - **Lipids** are fats and are typically stained with lipid-soluble dyes like **Oil Red O** or **Sudan Black**, especially in frozen sections to preserve their structure. - Prussian blue stain has no affinity for lipids and therefore cannot be used to detect them in histological samples.

Q: During cell death, myelin figures are derived from which of the following?

Cell membrane (lipid bilayer). ***Cell membrane (lipid bilayer)*** - **Myelin figures** are whorled phospholipid masses formed during cell injury and death from the breakdown of **cellular membranes**, particularly the plasma membrane and **endoplasmic reticulum**. - These structures represent damaged membrane lipids (phospholipids) that undergo structural rearrangement into concentric lamellar (layered) configurations resembling myelin. - The term "cell membrane" encompasses both the plasma membrane and lipid-rich intracellular membranes, making this the most accurate answer among the options provided. - They are a characteristic morphologic feature of **irreversible cell injury** and can be seen with electron microscopy. *Cytoplasmic components* - While cytoplasmic proteins and organelles do degrade during cell death, they do not form the organized **phospholipid structures** characteristic of myelin figures. - Cytoplasmic breakdown produces different morphologic changes such as cytoplasmic eosinophilia and loss of ribosomes. *Mitochondrial structures* - Mitochondria have their own membranes that are damaged during cell death (leading to release of cytochrome c and other apoptotic factors). - However, mitochondrial membranes are not the primary source of **myelin figures**, which predominantly arise from ER and plasma membranes. *Nuclear membrane* - The nuclear envelope does fragment during cell death, contributing to nuclear changes like **karyopyknosis, karyorrhexis, and karyolysis**. - While technically a membrane structure, the nuclear envelope is not the primary source of myelin figures, which are mainly derived from the more abundant plasma and ER membranes.

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: What causes the brown color of a contusion?

Hemosiderin. ***Hemosiderin*** - The brown color of a contusion is primarily due to **hemosiderin**, an iron-storage complex formed from the breakdown of **hemoglobin**. - As red blood cells trapped in the tissue degrade, their iron is released and converted into hemosiderin, which has a distinct reddish-brown to brown hue. *Decomposed hemoglobin* - While hemoglobin does decompose, it breaks down into stages that result in different colors (**biliverdin** for green, **bilirubin** for yellow), before the formation of hemosiderin. - The direct "decomposition" itself isn't the primary cause of the enduring brown color, but rather the subsequent iron deposition. *Bilirubin breakdown products* - **Bilirubin** is formed from the breakdown of **biliverdin**, which gives contusions their yellow color late in the healing process. - This stage precedes or coexists with the brown color, but bilirubin itself is responsible for the yellow, not the brown. *Methemoglobin* - **Methemoglobin** is an oxidized form of hemoglobin that can cause a **bluish-brown** discoloration, often seen in conditions like methemoglobinemia. - While it can manifest in some bruises, it is not the primary or universal cause of the typical brown color of a resolving contusion; that is usually due to iron deposition.

Question 1

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 2

Which of the following is an example of an antiapoptotic gene?

Accepted Answer

FLIP

Answer

P53

Answer

BAX

Answer

BIM

Question 3

Lines of Zahn are LEAST likely to be seen in -

Accepted Answer

Lung

Answer

Liver

Answer

Kidney

Answer

Heart

Question 4

Hyaline degeneration is found in -

Accepted Answer

Alcoholic liver disease

Answer

Alzheimer's disease

Answer

Acute myocardial infarction

Answer

Acute appendicitis

Question 5

Liquefactive necrosis is seen in:

Accepted Answer

Brain

Answer

Cardiac tissue

Answer

Pulmonary tissue

Answer

Splenic tissue

Question 6

Which molecule is primarily responsible for nuclear fragmentation during apoptosis?

Accepted Answer

Caspases

Answer

Apaf - 1

Answer

Oxygen free radicals

Answer

Endonuclease G

Question 7

What does Prussian blue staining specifically detect in histology?

Accepted Answer

Ferric iron

Answer

Ferrous iron

Answer

Glycogen

Answer

Lipids

Question 8

During cell death, myelin figures are derived from which of the following?

Accepted Answer

Cell membrane (lipid bilayer)

Answer

Cytoplasmic components

Answer

Mitochondrial structures

Answer

Nuclear membrane

Question 9

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 10

What causes the brown color of a contusion?

Accepted Answer

Hemosiderin

Answer

Decomposed hemoglobin

Answer

Bilirubin breakdown products

Answer

Methemoglobin

General Pathology — MCQs

General Pathology — MCQs

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