Liver and Biliary Pathology Practice Questions

Q: Anti-LKM-2 autoantibody is seen in drug-induced liver injury. It is directed against which of the following structures?

Cytochrome P450. ### Explanation **Correct Option: A. Cytochrome P450** Anti-Liver Kidney Microsome (LKM) antibodies are a group of autoantibodies directed against specific metabolic enzymes located within the endoplasmic reticulum (microsomes) of hepatocytes and renal tubular cells. * **Anti-LKM-2** is specifically associated with **Drug-Induced Liver Injury (DILI)**, most notably caused by the drug **Ticrynafen** (a diuretic). * The target antigen for Anti-LKM-2 is **Cytochrome P450 2C9 (CYP2C9)**. The drug acts as a hapten, modifying the P450 enzyme and triggering an immune response against it. **Analysis of Incorrect Options:** * **B. Cytoplasm:** While these antibodies react with antigens located in the cytoplasm (specifically the endoplasmic reticulum), "Cytochrome P450" is the specific molecular target [1]. In NEET-PG, the most specific biochemical target is always the preferred answer. * **C. Biliary tract:** Antibodies against the biliary tract (specifically the interlobular bile ducts) are characteristic of **Primary Biliary Cholangitis (PBC)**, where the hallmark antibody is Anti-Mitochondrial Antibody (AMA) [1]. * **D. Focal tract:** This is a distractor term with no specific clinical relevance to LKM antibodies or autoimmune liver disease. **High-Yield Clinical Pearls for NEET-PG:** * **Anti-LKM-1:** Target is **CYP2D6**. It is the hallmark of **Autoimmune Hepatitis (AIH) Type 2** (typically seen in children/young females) [1]. * **Anti-LKM-2:** Target is **CYP2C9**. Associated with **Drug-induced hepatitis** (Ticrynafen). * **Anti-LKM-3:** Target is **UDP-glucuronosyltransferase**. Associated with **Hepatitis D (Delta)** infection and AIH Type 2. * **Anti-SLA/LP:** Most specific antibody for Autoimmune Hepatitis [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 845-846.

Q: What is the commonest benign tumor of the liver?

Hemangioma. **Explanation:** **1. Why Hemangioma is Correct:** Cavernous hemangioma is the **most common benign primary tumor of the liver**. These are mesenchymal tumors composed of large, endothelial-lined vascular channels [1]. They are typically small, asymptomatic, and discovered incidentally during imaging or autopsy. While they can occur at any age, they are more frequently identified in adults. **2. Why the other options are incorrect:** * **Hematoma (Option A):** A hematoma is a localized collection of blood outside blood vessels, usually resulting from trauma or surgery. It is a reactive process, not a neoplastic tumor. * **Adenoma (Option B):** Hepatic Adenomas are benign epithelial tumors [1]. While clinically significant due to their association with **oral contraceptive pills (OCPs)** and the risk of rupture or malignant transformation, they are much rarer than hemangiomas [1]. * **Cholangioma (Option D):** Also known as bile duct adenoma, these are rare, small, benign tumors of the biliary epithelium. They are significantly less common than hemangiomas. **3. NEET-PG High-Yield Pearls:** * **Imaging:** On CT/MRI, hemangiomas show a characteristic **"centripetal filling"** pattern (peripheral globular enhancement with gradual central filling). * **Clinical Caution:** Biopsy is generally **contraindicated** if a hemangioma is suspected due to the high risk of intraperitoneal hemorrhage. * **Size:** Hemangiomas >10 cm are termed "Giant Hemangiomas." * **Most common primary malignant tumor:** Hepatocellular Carcinoma (HCC). * **Most common liver tumor overall:** Metastatic deposits (most commonly from the colon). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, p. 874.

Q: Given below is the histopathology of a liver biopsy of a patient with hemochromatosis. Which of the following special stains has been used?

Perls' Prussian blue stain. ***Perls' Prussian blue stain*** - **Perls' Prussian blue stain** is the gold standard for detecting **iron deposits** in tissues, which appears as blue granules in hepatocytes in hemochromatosis. - This stain specifically detects **ferric iron (Fe³⁺)** by forming a blue precipitate when potassium ferrocyanide reacts with iron in acidic conditions. *Von Kossa stain* - **Von Kossa stain** is used to detect **calcium deposits** in tissues, not iron deposits. - It would show **black deposits** where calcium is present, which is not relevant for diagnosing hemochromatosis. *Alcian blue stain* - **Alcian blue stain** is used to detect **mucins** and **acidic mucopolysaccharides** in tissues. - It has no utility in detecting **iron deposits** and would not assist in confirming hemochromatosis diagnosis. *Crystal violet stain* - **Crystal violet stain** is primarily used to detect **amyloid deposits** in tissues (Congo red is more commonly used). - It does not detect **iron** and would not be helpful in evaluating hemochromatosis liver pathology.

Question 1

A 62-year-old man presents with disorientation, jaundice, splenomegaly, and ascites. Laboratory tests show elevated ALT, AST, alkaline phosphatase, and bilirubin. A liver biopsy reveals alcoholic hepatitis with Mallory bodies. These cytoplasmic structures are composed of interwoven bundles of which of the following proteins?

Accepted Answer

Intermediate filaments

Answer

a1-Antitrypsin

Answer

b-Amyloid (Ab)

Answer

Prion protein (PrP)

Question 2

Nutmeg liver is a characteristic finding in which condition?

Accepted Answer

Chronic venous congestion

Answer

Hyperaemia of the liver

Answer

Hepatic thrombosis

Answer

Acute hepatic congestion

Question 3

Anti-LKM-2 autoantibody is seen in drug-induced liver injury. It is directed against which of the following structures?

Accepted Answer

Cytochrome P450

Answer

Cytoplasm

Answer

Biliary tract

Answer

Focal tract

Question 4

Amyloid deposits in the liver are initially seen in which location?

Accepted Answer

Space of Disse

Answer

Hepatic parenchyma

Answer

Intrahepatic ducts

Answer

Portal tract

Question 5

What is the commonest benign tumor of the liver?

Accepted Answer

Hemangioma

Answer

Hematoma

Answer

Adenoma

Answer

Cholangioma

Question 6

All of the following are true about fibrolamellar hepatocellular carcinoma except:

Accepted Answer

The tumor is well demarcated and encapsulated.

Answer

Alpha-fetoprotein (AFP) is typically not elevated.

Answer

Recurrence of the tumor is common.

Answer

Neurotensin levels may be elevated.

Question 7

Given below is the histopathology of a liver biopsy of a patient with hemochromatosis. Which of the following special stains has been used?

Accepted Answer

Perls' Prussian blue stain

Answer

Von Kossa stain

Answer

Alcian blue stain

Answer

Crystal violet stain

Question 8

Fatty liver is due to accumulation of which substance?

Accepted Answer

Triglycerides

Answer

LDL

Answer

Lipoprotein a

Answer

VLDL

Question 9

"Crumbled egg appearance" in liver is seen in which of the following conditions?

Accepted Answer

Hydatid liver disease

Answer

Hepatic adenoma

Answer

Chronic amoebic liver abscess

Answer

Haemangioma

Question 10

What is the most important risk factor for hepatocellular carcinoma?

Accepted Answer

Cirrhosis

Answer

Alcoholic hepatitis

Answer

Schistosomiasis

Answer

Fasciolopsis buski infestation

Liver and Biliary Pathology — MCQs

Liver and Biliary Pathology — MCQs

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