Liver and Biliary Pathology Practice Questions

Q: Centrilobular necrosis of the liver is typically associated with which of the following agents?

Carbon tetrachloride (CCl4). **Explanation:** **Centrilobular necrosis (Zone 3 necrosis)** refers to damage surrounding the terminal hepatic vein. This area is most susceptible to injury because it has the lowest oxygen tension (farthest from the hepatic artery) and the highest concentration of **Cytochrome P450 enzymes**. **Why Carbon tetrachloride (CCl4) is correct:** CCl4 is the classic example of a direct hepatotoxin. In Zone 3, it is metabolized by the P450 system into the highly reactive **trichloromethyl radical (•CCl3)**. This radical initiates lipid peroxidation of the endoplasmic reticulum membranes, leading to cellular swelling, fatty change, and ultimately, centrilobular necrosis. Other causes of Zone 3 necrosis include paracetamol (acetaminophen) toxicity [1] and congestive heart failure (nutmeg liver) [1]. **Analysis of Incorrect Options:** * **White phosphorus:** Typically causes **Zone 1 (Periportal) necrosis**. This area is the first to encounter blood-borne toxins entering via the portal triad. * **Yellow fever virus:** Characteristically causes **Mid-zonal (Zone 2) necrosis**. A high-yield finding here is the presence of **Councilman bodies** (apoptotic hepatocytes). * **Eclampsia:** Associated with **Periportal (Zone 1) necrosis** and subcapsular hemorrhages, often as part of the HELLP syndrome. **High-Yield Pearls for NEET-PG:** * **Zone 1 (Periportal):** First to receive oxygen; affected by phosphorus, eclampsia, and viral hepatitis. * **Zone 2 (Mid-zonal):** Affected by Yellow fever. * **Zone 3 (Centrilobular):** Most sensitive to ischemia (shock liver) and metabolic toxins (CCl4, Halothane, Rifampicin, and Acetaminophen) [1]. * **Councilman bodies:** Eosinophilic globules representing apoptotic hepatocytes, seen in Yellow fever and Viral hepatitis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 832, 870-872.

Q: Pigmentation in the liver is caused by all of the following except?

Wilson's disease. The question asks which of the listed conditions does **not** cause visible pigmentation in the liver. **Why Wilson’s Disease is the correct answer:** In Wilson’s Disease (Hepatolenticular degeneration), there is an accumulation of **Copper** in the liver due to a defect in the *ATP7B* gene. While copper levels are pathologically high, copper itself does not impart a distinct "pigment" visible on routine gross or microscopic examination in the same way the other options do. It requires special stains like **Rhodanine** or **Orcein** for visualization. Clinically, the characteristic pigmentation in Wilson's occurs in the eye (**Kayser-Fleischer rings**), not as a primary liver pigment. **Analysis of Incorrect Options:** * **Lipofuscin:** Known as the "wear-and-tear" pigment, it is a golden-brown pigment representing lipid peroxidation. It commonly accumulates in hepatocytes, especially in the elderly or in states of atrophy (Brown atrophy). * **Pseudomelanin:** This is a dark pigment (melanin-like) seen in **Dubin-Johnson Syndrome**. It results from the failure of hepatocytes to excrete epinephrine metabolites, giving the liver a characteristic "black" gross appearance. * **Malaria Pigment (Hemozoin):** During malaria infection, the breakdown of hemoglobin by parasites produces hemozoin. This pigment is taken up by the Kupffer cells in the liver, leading to a slate-grey or blackish discoloration. **NEET-PG High-Yield Pearls:** * **Dubin-Johnson vs. Rotor:** Both cause conjugated hyperbilirubinemia, but only Dubin-Johnson presents with a **black liver** (pseudomelanin). * **Iron vs. Copper:** Iron (Hemosiderin) appears blue on **Prussian Blue** stain; Copper appears reddish-brown on **Rhodanine** stain. * **Lipofuscin** is derived from free radical injury and lipid peroxidation; it is typically found at the poles of the nucleus.

Question 1

More than 80% of gallstones are composed of which of the following substances?

Accepted Answer

Cholesterol

Answer

Bile pigments

Answer

Calcium salts

Answer

Phospholipids

Question 2

Centrilobular necrosis of the liver is typically associated with which of the following agents?

Accepted Answer

Carbon tetrachloride (CCl4)

Answer

White phosphorus

Answer

Yellow fever virus

Answer

Eclampsia

Question 3

Pigmentation in the liver is caused by all of the following except?

Accepted Answer

Wilson's disease

Answer

Lipofuscin

Answer

Pseudomelanin

Answer

Malaria pigment

Question 4

What is true about hemochromatosis?

Accepted Answer

Is genetically heterogenous

Answer

Cannot be treated by phlebotomy

Answer

Is completely penetrant

Answer

Is more common in females

Question 5

Which of the following cells start producing collagen in case of hepatic cirrhosis?

Accepted Answer

Stellate cell

Answer

Endothelial cell

Answer

Kupffer cell

Answer

Bile duct epithelium

Question 6

Mitochondrial abnormality is seen in which of the following conditions?

Accepted Answer

Wilson's disease

Answer

Krabbe's disease

Answer

Fabry disease

Answer

Fanconi syndrome

Question 7

A patient with cirrhosis of the liver has the following coagulation parameters: Platelet count 2,00,000/µL, Prothrombin time 25s (control 12s), Activated partial thromboplastin time 60s (control 35s), Thrombin time 15s (control 15s). What is expected in this patient?

Accepted Answer

D-dimer will be normal

Answer

Fibrinogen will be <100 mg/dL

Answer

Antithrombin III will be high

Answer

Protein C will be elevated

Question 8

Which of the following is NOT a cause of granulomatous disease of the liver?

Accepted Answer

Dengue fever

Answer

Wegener's granulomatosis

Answer

Hodgkin's disease

Answer

Beryllium exposure

Question 9

Regarding hepatic adenoma, all of the following are true EXCEPT:

Accepted Answer

Normal liver architecture

Answer

Increased glycogen and fat in hepatocytes

Answer

Bile ductules are not seen

Answer

Tumor markers are normal

Question 10

Hemochromatosis is associated with all of the following except:

Accepted Answer

Gastric atrophy

Answer

Pigmentation

Answer

Diabetes Mellitus

Answer

Liver enlargement

Liver and Biliary Pathology — MCQs

Liver and Biliary Pathology — MCQs

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