Liver and Biliary Pathology Practice Questions

Q: What is the abnormality seen in Crigler-Najjar syndrome?

Defect in hepatic conjugation. **Explanation:** **Crigler-Najjar Syndrome (CNS)** is a rare autosomal recessive disorder characterized by a genetic mutation in the **UGT1A1 gene**. This gene encodes the enzyme **Uridine diphosphate-glucuronosyltransferase (UGT)**, which is responsible for converting unconjugated bilirubin into water-soluble conjugated bilirubin [1]. 1. **Why Option B is Correct:** In CNS, there is either a total absence (Type I) or a severe deficiency (Type II) of the UGT enzyme [1]. This leads to a profound **defect in hepatic conjugation**, resulting in severe, persistent unconjugated hyperbilirubinemia. 2. **Why Other Options are Incorrect:** * **Option A (Uptake):** A defect in bilirubin uptake is characteristic of **Gilbert Syndrome** (though it also involves mild conjugation defects) [1]. * **Option C & D (Excretion/Release):** Defects in the excretion of conjugated bilirubin into the bile canaliculi are seen in **Dubin-Johnson Syndrome** (defect in MRP2 protein) and **Rotor Syndrome** [1]. These conditions present with conjugated hyperbilirubinemia. **High-Yield Clinical Pearls for NEET-PG:** * **Type I CNS:** Complete enzyme absence; serum bilirubin >20 mg/dL; does not respond to Phenobarbital; risk of **Kernicterus** is very high; treatment is usually a liver transplant [1]. * **Type II (Arias Syndrome):** Partial enzyme deficiency (<10%); serum bilirubin <20 mg/dL; **responds to Phenobarbital** (which induces the remaining enzyme activity) [1]. * **Histology:** Liver biopsy in CNS is typically **normal**, unlike Dubin-Johnson, which shows a characteristic "black liver" due to melanin-like pigment [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 858-860.

Q: What is the characteristic histological finding in Reye's syndrome?

Glycogen depletion. **Explanation:** Reye’s syndrome is an acute, life-threatening condition characterized by encephalopathy and fatty liver, typically following a viral illness (like Influenza or Varicella) in children treated with **aspirin**. **Why Glycogen Depletion is correct:** The hallmark of Reye’s syndrome is severe **mitochondrial dysfunction**. This leads to a failure of fatty acid oxidation and a subsequent metabolic crisis. To compensate for the lack of energy production, the body rapidly consumes all available glucose stores. Histologically, this manifests as a profound **depletion of glycogen** in hepatocytes, alongside the characteristic **microvesicular steatosis** (fine lipid droplets that do not displace the nucleus). **Analysis of Incorrect Options:** * **A & B (Mitochondrial and ER changes):** While mitochondrial damage is the primary trigger, the specific morphological changes seen under electron microscopy are **swelling and pleomorphism** of mitochondria (loss of cristae), not "budding and branching." Swelling of the ER is a non-specific sign of cell injury and not a diagnostic hallmark here. * **C (Paranuclear microdense deposits):** These are not associated with Reye’s syndrome. They are more characteristic of certain storage disorders or specific protein aggregation pathologies. **High-Yield Clinical Pearls for NEET-PG:** * **Aspirin Link:** Aspirin acts as a mitochondrial toxin in susceptible children by inhibiting beta-oxidation. * **Biochemical Markers:** Elevated serum ammonia, prolonged PT/INR, and elevated AST/ALT with **normal bilirubin** (a key distinguishing feature). * **Morphology:** Microvesicular steatosis is seen in Reye’s, Fatty Liver of Pregnancy, and Valproate toxicity. * **Brain Pathology:** Cerebral edema is the most common cause of death; however, there is typically **no inflammation** in the brain or liver.

Q: What type of obstruction characterizes Budd-Chiari syndrome?

Extrahepatic postsinusoidal. **Explanation:** **Budd-Chiari Syndrome (BCS)** is defined as the obstruction of hepatic venous outflow at any level from the small hepatic veins to the junction of the inferior vena cava (IVC) with the right atrium [1]. 1. **Why Option B is Correct:** The "sinusoid" is the functional unit of the liver. Obstruction occurring after the blood has passed through the sinusoids is termed **postsinusoidal**. Since the blockage in BCS occurs in the major hepatic veins or the IVC (outside the functional liver parenchyma), it is classified as **extrahepatic postsinusoidal** obstruction. This leads to increased sinusoidal pressure, centrilobular congestion, and necrosis [1]. 2. **Why Other Options are Incorrect:** * **Extrahepatic presinusoidal (A):** Refers to obstruction before blood reaches the liver, typically **Portal Vein Thrombosis**. * **Sinusoidal (C):** Refers to pathology within the sinusoids, such as **Cirrhosis** or Sickle Cell Disease. * **Intrahepatic postsinusoidal (D):** Refers to obstruction of the terminal hepatic venules (small venules) within the liver. The classic example is **Sinusoidal Obstruction Syndrome (Veno-occlusive disease)**, often seen after bone marrow transplantation or ingestion of pyrrolizidine alkaloids (Bush tea). **NEET-PG High-Yield Pearls:** * **Classic Triad:** Abdominal pain, hepatomegaly, and ascites. * **Morphology:** The liver shows a **"Nutmeg liver"** appearance (congestive hepatopathy) [1]. * **Microscopy:** Centrilobular (Zone 3) congestion and necrosis [1]. * **Imaging:** The **Caudate lobe** is often enlarged (hypertrophied) because it has independent venous drainage directly into the IVC, sparing it from the obstruction. * **Most common cause:** Polycythemia vera (and other hypercoagulable states) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 869-870.

Question 1

Absence of ultrahepatic bile ducts leads to which syndrome?

Accepted Answer

Alagille Syndrome

Answer

Von Meyenburg Complexes

Answer

Polycystic Liver Disease

Answer

Caroli Disease

Question 2

Which of the following antibodies are true for Autoimmune type II Liver disease?

Accepted Answer

LKM-1 antibody and LC-1, and LC-2

Answer

Antinuclear antibody and DS DNA

Answer

LKM-1 antibody and Antismooth muscle antibody

Answer

DS DNA and LC-1, and LC-2

Question 3

Piece meal necrosis on liver biopsy is a feature of which of the following conditions?

Accepted Answer

Chronic active hepatitis

Answer

Alcoholic hepatitis

Answer

Indian childhood cirrhosis

Answer

Primary alcoholic cirrhosis

Question 4

In Malaria, what histopathological changes would be observed in the liver?

Accepted Answer

Kupffer's cell hyperplasia with macrophage infiltration around the periportal area laden with pigments

Answer

Microabscess formation

Answer

Non-caseating granuloma

Answer

Non-specific finding of neutrophilic infiltration

Question 5

Centrilobular necrosis of the liver may be seen with which of the following exposures?

Accepted Answer

Carbon tetrachloride (CCl4)

Answer

Phosphorus

Answer

Arsenic

Answer

Ethanol

Question 6

What is the abnormality seen in Crigler-Najjar syndrome?

Accepted Answer

Defect in hepatic conjugation

Answer

Uptake of bilirubin

Answer

Canalicular release

Answer

Reduced bile excretion

Question 7

Which of the following is NOT true regarding hepatic adenoma?

Accepted Answer

More common in older females

Answer

A benign lesion

Answer

Associated with oral contraceptive pill (OCP) use

Answer

Appears cold on isotope scan

Question 8

What is the characteristic histological finding in Reye's syndrome?

Accepted Answer

Glycogen depletion

Answer

Budding and branching of mitochondria

Answer

Swelling of the endoplasmic reticulum

Answer

Paranuclear microdense deposits

Question 9

What type of obstruction characterizes Budd-Chiari syndrome?

Accepted Answer

Extrahepatic postsinusoidal

Answer

Extrahepatic presinusoidal

Answer

Sinusoidal

Answer

Intrahepatic postsinusoidal

Question 10

Which of the following is a tumor marker for Hepatocellular carcinoma?

Accepted Answer

AFP

Answer

CEA

Answer

HCG

Answer

CA-125

Liver and Biliary Pathology — MCQs

Liver and Biliary Pathology — MCQs

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