Liver and Biliary Pathology Practice Questions

Q: What is true about hemochromatosis?

Mutation of C282Y. **Explanation:** Hereditary Hemochromatosis (HH) is an autosomal recessive disorder characterized by excessive intestinal iron absorption leading to multiorgan deposition [1]. **1. Why Option A is correct:** The most common cause of HH is a mutation in the **HFE gene** located on **Chromosome 6** [1]. The **C282Y mutation** (substitution of tyrosine for cysteine at position 282) is the most frequent genetic defect (found in >80% of cases). This mutation disrupts the interaction between the HFE protein and the transferrin receptor, leading to inappropriately low levels of **Hepcidin**, the master regulator of iron homeostasis [2]. **2. Why the other options are incorrect:** * **Option B:** While the genetic inheritance is equal, the clinical disease is **more common in men** (ratio ~5:1 to 10:1). Women are protected for decades due to physiological iron loss through menstruation and pregnancy. * **Option C:** **Phlebotomy** is the **gold standard treatment** [3]. It is highly effective, inexpensive, and reduces the risk of cirrhosis and hepatocellular carcinoma if started early. * **Option D:** HH has **low clinical penetrance**. While many individuals are homozygous for the C282Y mutation, only a small fraction (especially in women) develop the full clinical triad of "Bronze Diabetes" [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Skin hyperpigmentation (bronzing), Diabetes mellitus, and Cirrhosis [1]. * **Early Sign:** Arthropathy (specifically involving the 2nd and 3rd MCP joints with "hook-like" osteophytes). * **Screening:** Transferrin saturation (>45%) is the best initial screening test; Ferritin levels reflect total body stores. * **Diagnosis:** MRI (T2*) can quantify liver iron; Genetic testing has largely replaced liver biopsy for diagnosis [3]. * **Cardiac:** Most common manifestation is restrictive cardiomyopathy (though dilated can occur).

Q: Identify the type of gallstone shown below.

Cholesterol stone. ***Cholesterol stone*** - Appears **yellow-green** in color with a **smooth, round surface** and shows **radiating crystalline pattern** on cut section. - Contains **>70% cholesterol** and is typically **large, solitary**, associated with **obesity**, **female gender**, and **rapid weight loss**. *Mixed stone* - Contains **20-70% cholesterol** mixed with **calcium bilirubinate** and appears **brown to black** with **faceted surfaces**. - Multiple stones are usually present with **laminated appearance** on cut section, often associated with **gallbladder stasis**. *Brown pigment stone* - **Brown, soft, and crumbly** stones containing **calcium bilirubinate** and **bacterial debris** from **E. coli** or **Klebsiella**. - Typically found in **bile ducts** rather than gallbladder, associated with **biliary tract infections** and **parasitic infestations**. *Black pigment stone* - **Hard, black, spiculated** stones composed of **calcium bilirubinate** and **mucin glycoproteins**. - Associated with **hemolytic conditions** like **sickle cell disease** and **cirrhosis**, typically **small and multiple**.

Q: Oral contraceptive agents typically cause which of the following in the liver?

Cholestasis without portal inflammation. **Explanation:** The correct answer is **Cholestasis without portal inflammation (Option B)**. Oral Contraceptive Pills (OCPs) contain synthetic estrogens and progestins that can interfere with the transport of bile acids across the canalicular membrane [1]. This leads to **bland cholestasis**, characterized by the presence of bile plugs within dilated canaliculi and bilirubin staining of hepatocytes [1]. Crucially, this occurs **without** significant hepatocyte necrosis or portal tract inflammation, distinguishing it from viral or drug-induced hepatitis. **Analysis of Incorrect Options:** * **A. Microvesicular fatty infiltration:** This is classically associated with Reye’s syndrome, Acute Fatty Liver of Pregnancy (AFLP), and Valproate toxicity, not OCP use. * **C. Portal inflammation:** OCP-induced liver injury is "bland," meaning it lacks the inflammatory infiltrate (lymphocytes/neutrophils) typically seen in viral hepatitis or primary biliary cholangitis. * **D. Perivenular fibrosis:** This is a hallmark of alcoholic liver disease (steatohepatitis) and is not a feature of OCP-induced injury. **High-Yield Clinical Pearls for NEET-PG:** * **OCPs and Tumors:** OCP use is the most significant risk factor for **Hepatic Adenoma**. These tumors carry a risk of rupture and intraperitoneal hemorrhage, especially during pregnancy. * **Vascular Complications:** OCPs are prothrombotic and are a known risk factor for **Budd-Chiari Syndrome** (hepatic vein thrombosis). * **Gallstones:** Estrogen increases cholesterol secretion into bile (lithogenic bile), increasing the incidence of cholelithiasis in OCP users. * **Dubin-Johnson Syndrome:** OCPs can exacerbate jaundice in patients with underlying Dubin-Johnson or Rotor syndrome due to impaired bilirubin excretion [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 860-874.

Question 1

A 60-year-old male with a known history of cirrhosis of the liver presents with elevated Alpha-fetoprotein levels and hepatomegaly 3 cm below the costal margin. Ultrasound reveals lesions in the right lobe of the liver. What is the most probable diagnosis?

Accepted Answer

Hepatocellular carcinoma

Answer

Focal nodular hyperplasia

Answer

Hepatic adenoma

Answer

Metastasis

Question 2

Acute liver injury associated with hepatitis B virus is due to which mechanism?

Accepted Answer

Sensitized cytolytic T-cells

Answer

Direct cytopathic effect of the virus

Answer

Immune-complex mediated tissue damage

Answer

Vasculitis

Question 3

A child who was given aspirin died. A pathological autopsy was performed, which showed a characteristic feature that can be used for making a diagnosis of the cause of death. What is this feature?

Accepted Answer

Steatosis

Answer

Fibrosis

Answer

Cirrhosis

Answer

Hepatocellular carcinoma

Question 4

All of the following simulate chronic hepatitis except?

Accepted Answer

HAV

Answer

HBV

Answer

Haemochromatosis

Answer

Wilson's disease

Question 5

What is true about hemochromatosis?

Accepted Answer

Mutation of C282Y

Answer

More common in women than in men

Answer

Cannot be treated with phlebotomy

Answer

Fully penetrant

Question 6

Identify the type of gallstone shown below.

Accepted Answer

Cholesterol stone

Answer

Mixed stone

Answer

Brown pigment stone

Answer

Black pigment stone

Question 7

Which of the following is the most common cause of pre-sinusoidal intrahepatic portal hypertension?

Accepted Answer

Schistosomiasis

Answer

Cirrhosis

Answer

Sarcoidosis

Answer

Graft-versus-host disease

Question 8

Hepatocellular carcinoma is caused by all of the following except?

Accepted Answer

Exposure to industrial dyes

Answer

Hepatitis B

Answer

Primary Biliary Cirrhosis

Answer

Chronic alcohol consumption

Question 9

Oral contraceptive agents typically cause which of the following in the liver?

Accepted Answer

Cholestasis without portal inflammation

Answer

Microvesicular fatty infiltration

Answer

Portal inflammation

Answer

Perivenular fibrosis in portal circulation

Question 10

A 22-year-old woman presents with congenital anemia requiring multiple RBC transfusions for many years. On physical examination, her skin has a bronze color and liver function tests show reduced serum albumin. Which of the following findings would most likely appear in a liver biopsy specimen?

Accepted Answer

Hemosiderin in hepatocytes

Answer

Amyloid in portal triads

Answer

Bilirubin in canaliculi

Answer

Glycogen in hepatocytes

Liver and Biliary Pathology — MCQs

Liver and Biliary Pathology — MCQs

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