Gastroenterology Practice Questions

Q: A 16-year-old girl presents with chronic diarrhea and weight loss. She has large-volume, watery, painless diarrhea that persists even when fasting and is unrelated to food or liquids. She is not on any medications, has no travel history, and no other constitutional symptoms. Her physical examination is normal. What is the most likely diagnosis?

Secretory diarrhea. ### Explanation **Correct Answer: D. Secretory Diarrhea** The hallmark of **secretory diarrhea** is large-volume, watery stools that **persist during fasting** and occur even at night. This happens because the intestinal mucosa is actively secreting electrolytes (and water follows) or failing to absorb them, independent of oral intake. In this clinical scenario, the persistence of diarrhea despite fasting and the lack of relationship to food intake are the pathognomonic features that point toward a secretory etiology. **Why other options are incorrect:** * **A & B (Partial Bowel Obstruction):** While partial obstruction can cause "overflow" diarrhea, it is typically associated with colicky abdominal pain, distension, and nausea. The patient’s diarrhea is described as painless and her physical exam is normal, making obstruction unlikely. * **C (Osmotic Diarrhea):** This type of diarrhea is caused by poorly absorbed solutes (e.g., lactose in lactase deficiency or magnesium salts) in the gut lumen. The key differentiator is that **osmotic diarrhea stops or significantly improves with fasting**, as the offending osmotic agent is no longer being ingested. **NEET-PG High-Yield Pearls:** * **Fecal Osmotic Gap:** This is the gold standard for differentiating secretory from osmotic diarrhea. * *Secretory:* Low gap ( 125 mOsm/kg). * **Common Causes of Secretory Diarrhea:** Enterotoxins (Vibrio cholerae, ETEC), Neuroendocrine tumors (VIPoma/WDHA syndrome, Carcinoid), and bile acid malabsorption. * **VIPoma (Verner-Morrison Syndrome):** Classically presents as **W**atery **D**iarrhea, **H**ypokalemia, and **A**chlorhydria (WDHA).

Q: A 14-year-old girl presents with a ten-month history of periumbilical abdominal pain, postprandial pain, fever, weight loss, and episodes of hematochezia. What is the most likely diagnosis?

Crohn's disease. **Explanation:** The clinical presentation of a young patient with chronic abdominal pain, weight loss, fever, and **hematochezia** (bloody stools) is highly characteristic of **Inflammatory Bowel Disease (IBD)**, specifically **Crohn’s Disease** [1]. 1. **Why Crohn’s Disease is correct:** Crohn’s is a transmural inflammatory condition that can affect any part of the GIT. In children and adolescents, it often presents with periumbilical or right lower quadrant pain (due to terminal ileitis) and systemic features like growth failure, weight loss, and fever [1]. While ulcerative colitis more commonly presents with gross hematochezia, Crohn’s involving the colon (Crohn’s colitis) or ileocolic region frequently presents with occult or overt blood in the stool [1]. 2. **Why other options are incorrect:** * **Chronic appendicitis:** Usually presents with recurrent right lower quadrant pain but does not typically cause significant weight loss, chronic fever, or hematochezia. * **Chronic pancreatitis:** Characterized by epigastric pain radiating to the back and steatorrhea (fatty stools) rather than hematochezia. It is rare in a 14-year-old unless associated with cystic fibrosis or hereditary factors. * **Bulimia:** While it can cause weight fluctuations and abdominal discomfort, it does not cause fever or lower gastrointestinal bleeding. **High-Yield Clinical Pearls for NEET-PG:** * **Distribution:** Crohn’s is characterized by **"skip lesions"** and is most common in the terminal ileum [1]. * **Endoscopy:** Look for a **"cobblestone appearance"** and aphthous ulcers [2]. * **Histology:** Presence of **non-caseating granulomas** is pathognomonic (seen in ~50% of cases). * **Complications:** Transmural inflammation leads to **fistulas, strictures, and perianal disease** (skin tags/fissures), which are rare in Ulcerative Colitis [1].

Q: In a patient with fulminant liver failure after viral hepatitis, which of the following will not change immediately?

Serum albumin. **Explanation:** The correct answer is **Serum albumin (Option A)**. This is a classic high-yield concept in hepatology based on the **biological half-life** of proteins synthesized by the liver. **1. Why Serum Albumin is the correct answer:** Albumin is a protein synthesized exclusively by the liver. However, it has a long half-life of approximately **20 days**. In the setting of acute or fulminant liver failure, even if the liver stops producing albumin entirely, the existing serum levels remain relatively stable for several days. Therefore, serum albumin is a marker of **chronic** liver disease (like cirrhosis) rather than acute liver injury. **2. Why the other options are incorrect:** * **Prothrombin Time (PT/INR):** This is the most sensitive indicator of acute liver function [1]. Coagulation factors (especially Factor VII) have very short half-lives (4–6 hours) [1]. In fulminant failure, PT prolongs rapidly, making it the best prognostic marker [1]. * **Serum Bilirubin:** In fulminant hepatitis, massive hepatocyte necrosis leads to an immediate and sharp rise in bilirubin levels due to the liver's inability to conjugate and excrete it. * **Serum Ammonia:** The liver is responsible for converting ammonia to urea. In acute failure, this detoxification process fails immediately, leading to a rapid rise in ammonia levels, which contributes to hepatic encephalopathy [1]. **Clinical Pearls for NEET-PG:** * **Best prognostic marker for Acute Liver Failure:** Prothrombin Time (PT) [1]. * **Half-life of Albumin:** ~20 days (decreased in chronic states). * **Half-life of Factor VII:** ~5–72 hours for vitamin K-dependent factors collectively, with Factor VII being the shortest [1]. * **Fulminant Liver Failure Definition:** Development of hepatic encephalopathy within 8 weeks of the onset of jaundice in a patient without pre-existing cirrhosis [1].

Q: A 29-year-old woman presents with a small increase in unconjugated bilirubin found on routine annual blood testing. There is no evidence of hemolysis, and her liver enzymes and function tests are otherwise normal. She has no prior history of liver disease and is not taking any medications. Her physical examination is completely normal with no signs of chronic liver disease. Which of the following is the most likely diagnosis?

Gilbert syndrome. **Explanation:** The clinical presentation describes an asymptomatic young adult with isolated, mild **unconjugated hyperbilirubinemia** and normal liver enzymes/function tests, which is the classic hallmark of **Gilbert syndrome** [1]. **1. Why Gilbert Syndrome is Correct:** Gilbert syndrome is a common, benign autosomal recessive condition caused by reduced activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)** [1, 2]. This leads to impaired conjugation of bilirubin. Bilirubin levels are typically <4 mg/dL and often fluctuate, increasing during periods of stress, fasting, illness, or strenuous exercise [2]. Since there is no hemolysis (normal hemoglobin/reticulocyte count) and no structural liver damage, it is often an incidental finding [2]. **2. Why Other Options are Incorrect:** * **Crigler-Najjar Syndrome:** This involves a more severe deficiency (Type II) or total absence (Type I) of UGT1A1 [1]. It presents in infancy with much higher levels of unconjugated bilirubin (often >20 mg/dL in Type I), posing a risk of kernicterus [1]. * **Dubin-Johnson Syndrome:** This is a defect in the excretion of conjugated bilirubin into the bile ducts. It presents with **conjugated hyperbilirubinemia** and a characteristic black-pigmented liver. * **Rotor Syndrome:** Similar to Dubin-Johnson, this involves **conjugated hyperbilirubinemia** due to impaired hepatic storage/reuptake of bilirubin, but without the liver pigmentation. **Clinical Pearls for NEET-PG:** * **Most common** hereditary hyperbilirubinemia [2]. * **Diagnosis of exclusion:** Normal CBC, reticulocyte count, and LFTs (except bilirubin) are essential. * **Phenobarbital** can be used to induce UGT1A1 activity (though rarely needed clinically) [1]. * **Key Trigger:** Fasting (the "Caloric Restriction Test") increases bilirubin levels in these patients [2].

Q: All are true about hepatopulmonary syndrome except?

A preoperative oxygen tension of <30 mmHg alone is a predictor of disease. Hepatopulmonary Syndrome (HPS) is a triad of **liver disease**, **increased alveolar-arterial oxygen gradient** (hypoxemia), and **intrapulmonary vascular dilatations (IPVDs)** [1]. **Why Option D is the Correct Answer (The False Statement):** A preoperative PaO₂ of ** 20 mmHg in patients >64 years) while breathing room air. **Analysis of Other Options:** * **Option A:** The prevalence of HPS in patients awaiting liver transplantation is reported to be between **8% and 29%**, making this a true statement. * **Option B:** HPS is characterized by **functional shunting** due to massive precapillary and capillary dilatations [1]. This leads to a "diffusion-perfusion mismatch" where oxygen cannot reach the center of the dilated vessel to saturate the hemoglobin. * **Option C:** Currently, **Orthotopic Liver Transplantation** is the only definitive treatment that leads to the resolution of HPS in the majority of patients [1]. Medical therapies (like somatostatin or garlic) have not shown consistent benefits. **High-Yield Clinical Pearls for NEET-PG:** 1. **Platypnea:** Shortness of breath that worsens when sitting or standing. 2. **Orthodeoxia:** A decrease in arterial oxygen saturation (>5% or >4 mmHg) when moving from a supine to an upright position [1]. 3. **Gold Standard Investigation:** Contrast-enhanced echocardiography (Bubble study) using agitated saline. Appearance of microbubbles in the left atrium after **3–6 cardiac cycles** indicates IPVDs. 4. **MAA Lung Scan:** Used to quantify the shunt fraction; a brain uptake of >6% is abnormal.

Q: Which of the following is the least likely manifestation of acute Budd-Chiari syndrome?

Venous collaterals. **Explanation:** The core concept in this question is the differentiation between **acute** and **chronic** presentations of Budd-Chiari Syndrome (BCS). BCS results from the obstruction of hepatic venous outflow, leading to post-sinusoidal portal hypertension. **Why "Venous Collaterals" is the correct answer:** Venous collaterals (such as caput medusae or prominent abdominal wall veins) are signs of **chronic** portal hypertension [1]. They require weeks to months to develop as the body attempts to bypass the venous obstruction. In an **acute** presentation, the sudden blockage leads to rapid hepatic congestion and pressure buildup before collateral pathways have time to form. Therefore, they are the least likely finding in the acute phase. **Analysis of Incorrect Options:** * **Enlarged tender liver:** In acute BCS, the sudden venous outflow obstruction causes massive hepatic congestion and stretching of Glisson’s capsule, leading to painful hepatomegaly [2]. * **Ascites:** The rapid increase in sinusoidal pressure leads to the transudation of fluid into the peritoneal cavity. Ascites in BCS is typically high-protein (SAAG >1.1 g/dL). * **Jaundice:** While often mild, jaundice occurs in acute BCS due to centrizonal (Zone 3) congestion and subsequent hepatocellular damage. **NEET-PG High-Yield Pearls:** * **Classic Triad:** Abdominal pain, hepatomegaly, and ascites. * **Imaging:** Doppler Ultrasound is the initial investigation of choice; "Spider-web" appearance on venography is characteristic. * **Pathology:** The **Caudate lobe** often undergoes compensatory hypertrophy because its venous drainage (directly into the IVC) is frequently spared. * **Most common cause (Global):** Thrombosis (often associated with polycythemia vera or prothrombotic states). In Asia, membranous webs of the IVC are more common.

Question 1

A 16-year-old girl presents with chronic diarrhea and weight loss. She has large-volume, watery, painless diarrhea that persists even when fasting and is unrelated to food or liquids. She is not on any medications, has no travel history, and no other constitutional symptoms. Her physical examination is normal. What is the most likely diagnosis?

Accepted Answer

Secretory diarrhea

Answer

Partial small bowel obstruction

Answer

Partial large bowel obstruction

Answer

Osmotic diarrhea

Question 2

A 26-year-old man diagnosed with adenocarcinoma of the stomach seeks information about potential causes. Which of the following is a risk factor for developing gastric cancer?

Accepted Answer

Helicobacter pylori infection

Answer

Exposure to ionizing radiation

Answer

Blood group B

Answer

A diet high in fiber

Question 3

A 14-year-old girl presents with a ten-month history of periumbilical abdominal pain, postprandial pain, fever, weight loss, and episodes of hematochezia. What is the most likely diagnosis?

Accepted Answer

Crohn's disease

Answer

Chronic appendicitis

Answer

Chronic pancreatitis

Answer

Bulimia

Question 4

A known alcoholic presents to the emergency room with hematemesis. On examination, the patient has ascites, splenomegaly, and gynecomastia. What is the most likely diagnosis?

Accepted Answer

Portal hypertension due to alcoholic cirrhosis

Answer

Portal hypertension secondary to viral hepatitis

Answer

Budd-Chiari Syndrome

Answer

Primary Sclerosing Cholangitis

Question 5

In a patient with fulminant liver failure after viral hepatitis, which of the following will not change immediately?

Accepted Answer

Serum albumin

Answer

Prothrombin time (PT)

Answer

Serum bilirubin

Answer

Serum ammonia

Question 6

A 29-year-old woman presents with a small increase in unconjugated bilirubin found on routine annual blood testing. There is no evidence of hemolysis, and her liver enzymes and function tests are otherwise normal. She has no prior history of liver disease and is not taking any medications. Her physical examination is completely normal with no signs of chronic liver disease. Which of the following is the most likely diagnosis?

Accepted Answer

Gilbert syndrome

Answer

Crigler-Najjar syndrome

Answer

Dubin-Johnson syndrome

Answer

Rotor syndrome

Question 7

All are true about hepatopulmonary syndrome except?

Accepted Answer

A preoperative oxygen tension of <30 mmHg alone is a predictor of disease

Answer

Frequency in end-stage liver disease (ESLD) is between 8-29%

Answer

Characterized by hypoxemia and anatomical shunting of blood

Answer

The only established treatment at present is orthotopic liver transplantation (OLT)

Question 8

In a patient with Wilson disease-related compensated cirrhosis, without evidence of neurologic or psychiatric symptoms, what is the best treatment option?

Accepted Answer

Zinc

Answer

Trientine

Answer

Tetrathiomolybdate

Answer

d-penicillamine

Question 9

Which of the following is the least likely manifestation of acute Budd-Chiari syndrome?

Accepted Answer

Venous collaterals

Answer

Enlarged tender liver

Answer

Ascites

Answer

Jaundice

Question 10

Diarrhea associated with acanthocytes in a blood smear suggests which of the following conditions?

Accepted Answer

Abetalipoproteinemia

Answer

Whipple's disease

Answer

Celiac sprue

Answer

Ulcerative colitis

Gastroenterology — MCQs

Gastroenterology — MCQs

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