Gastroenterology — MCQs

A 65-year-old man presented with an episode of syncope. He reported feeling dizzy during defecation and noted gross bleeding in the toilet pan. A fecal occult blood test done 3 months prior as part of routine screening for colon cancer was negative. There is no history of recent weight loss. What is the likely colonoscopic finding?

Q379Medium

A young patient presents with jaundice. Total bilirubin is 21 mg/dL, direct bilirubin is 9.6 mg/dL, and alkaline phosphatase is 84 KA units. What is the most likely diagnosis?

Q380Medium

Which of the following is a specific marker for intestinal inflammation?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 371: Which of the following is NOT a complication of ulcerative colitis?

A. Peptic ulceration (Correct Answer)
B. Arthritis
C. Sclerosing cholangitis
D. Toxic megacolon

Explanation: **Explanation:** Ulcerative Colitis (UC) is a chronic inflammatory bowel disease characterized by mucosal inflammation limited to the colon and rectum [2]. Complications are categorized into intestinal (local) and extra-intestinal (systemic) manifestations [3]. **Why Peptic Ulceration is the correct answer:** Peptic ulceration is a disease of the upper gastrointestinal tract (stomach and duodenum) primarily caused by *H. pylori* infection or NSAID use [1]. It is **not** pathophysiologically linked to ulcerative colitis. While Crohn’s disease can involve any part of the GIT from mouth to anus (including the stomach), UC strictly involves the large intestine [2]. **Analysis of incorrect options:** * **Arthritis:** This is the **most common** extra-intestinal manifestation of UC. It typically presents as peripheral arthritis (often mirroring bowel activity) or axial involvement like Ankylosing Spondylitis (independent of bowel activity) [3]. * **Sclerosing Cholangitis (PSC):** Primary Sclerosing Cholangitis is a classic hepatobiliary complication [3]. Approximately 70-80% of patients with PSC have underlying UC. It increases the risk of cholangiocarcinoma. * **Toxic Megacolon:** A life-threatening intestinal complication where the colon dilates (>6 cm) due to transmural inflammation, leading to a risk of perforation and sepsis. **NEET-PG High-Yield Pearls:** * **Most common extra-intestinal manifestation:** Peripheral Arthritis [3]. * **Most specific skin manifestation:** Pyoderma Gangrenosum (more common in UC than Crohn's). * **Malignancy risk:** UC significantly increases the risk of Colorectal Carcinoma; screening colonoscopy is recommended 8–10 years after diagnosis. * **Serology:** p-ANCA is positive in 60-70% of UC patients.

Question 372: In Wilson disease patients with hepatic decompensation, which index is used to assess disease severity?

A. Nazer prognostic index (Correct Answer)
B. Ishak scoring system
C. Lille score
D. Rockall score

Explanation: **Explanation:** The **Nazer Prognostic Index** is the specific scoring system used to assess the severity and predict mortality in patients with Wilson disease presenting with hepatic decompensation. It utilizes three parameters: **Serum Bilirubin, Serum AST (SGOT), and Prothrombin Time (INR)**. A score of 7 or more indicates a high risk of mortality and serves as a critical indicator for urgent liver transplantation. **Analysis of Options:** * **A. Nazer Prognostic Index (Correct):** Specifically designed for Wilson disease. It helps clinicians decide between medical management (chelators) and liver transplantation. * **B. Ishak Scoring System:** This is a histological scoring system used to grade activity (necroinflammation) and stage fibrosis in chronic hepatitis (e.g., Hepatitis B or C) based on liver biopsy findings. * **C. Lille Score:** Used specifically in **Alcoholic Hepatitis** to predict 6-month survival and assess the response to corticosteroid therapy after 7 days of treatment. * **D. Rockall Score:** Used to assess the risk of re-bleeding and mortality in patients with **Acute Upper Gastrointestinal Bleeding**. **High-Yield Clinical Pearls for NEET-PG:** * **Wilson Disease Triad:** Liver disease, neuropsychiatric symptoms (basal ganglia involvement), and Kayser-Fleischer (KF) rings [1]. * **Diagnosis:** Low serum ceruloplasmin (<20 mg/dL), increased 24-hour urinary copper excretion, and the "Giant Panda" sign on MRI brain. * **Coombs-Negative Hemolytic Anemia:** A classic presentation of Wilsonian fulminant hepatic failure due to the sudden release of copper into the bloodstream [1]. * **Treatment:** Penicillamine (drug of choice), Trientine, or Zinc (for maintenance/asymptomatic cases).

Question 373: Celiac sprue is associated with which HLA type?

A. HLA DQ 1
B. HLA DQ2 (Correct Answer)
C. HLA DQ3
D. HLA DQ4

Explanation: **Explanation:** Celiac disease (Gluten-sensitive enteropathy) is a T-cell mediated autoimmune disorder triggered by the ingestion of gluten in genetically predisposed individuals. The genetic susceptibility is strongly linked to specific Class II Human Leukocyte Antigens (HLA) [1]. **Why HLA-DQ2 is correct:** Approximately **95% of patients** with Celiac disease carry the **HLA-DQ2** allele. The remaining 5% usually carry **HLA-DQ8**. These specific HLA molecules have a high affinity for binding deamidated gliadin peptides (derived from gluten). Once bound, these peptides are presented to CD4+ T-cells, triggering an inflammatory cascade that leads to villous atrophy and malabsorption [1]. **Analysis of Incorrect Options:** * **HLA-DQ1:** Not associated with Celiac disease; it is more commonly linked to certain types of narcolepsy or peripheral neuropathies in specific research contexts. * **HLA-DQ3:** This is a broad serotype that includes DQ7, DQ8, and DQ9. While DQ8 is associated with Celiac, the general category DQ3 is not the primary diagnostic marker. * **HLA-DQ4:** No established clinical association with Celiac disease or major autoimmune enteropathies. **NEET-PG High-Yield Pearls:** * **Negative Predictive Value:** The absence of HLA-DQ2/DQ8 has a nearly **100% negative predictive value**, meaning if a patient lacks both, Celiac disease can be effectively ruled out. * **Associated Conditions:** Celiac disease is frequently associated with **Dermatitis Herpetiformis** (intensely pruritic vesicles on extensors) and **Selective IgA Deficiency**. * **Gold Standard Diagnosis:** Intestinal biopsy showing **Villous Atrophy**, Crypt Hyperplasia, and increased Intraepithelial Lymphocytes (Marsh Classification) [1]. * **Serology:** Anti-tissue Transglutaminase (anti-tTG) IgA is the screening test of choice.

Question 374: In a patient with jaundice, what does the absence of urobilinogen in the urine indicate?

A. Obstructive jaundice (Correct Answer)
B. Hemolysis
C. Liver failure
D. Hepatitis

Explanation: ### Explanation **1. Why Obstructive Jaundice is Correct:** The presence of urobilinogen in urine depends on the **enterohepatic circulation** of bilirubin. In a healthy state, conjugated bilirubin is excreted into the intestine via the bile duct, where gut bacteria convert it into urobilinogen [1]. Most of this is excreted in feces (as stercobilin), but a small portion is reabsorbed into the portal blood and excreted by the kidneys. In **Obstructive Jaundice** (Post-hepatic), there is a complete blockage of bile flow into the intestine. Since no bilirubin reaches the gut, no urobilinogen is formed [1]. Consequently, there is nothing to be reabsorbed into the blood or excreted in the urine, leading to **absent urinary urobilinogen** [1]. **2. Why the Other Options are Incorrect:** * **Hemolysis (Pre-hepatic):** Increased breakdown of RBCs leads to high levels of unconjugated bilirubin, which results in increased production and excretion of urobilinogen. Urine urobilinogen is **elevated** here [1]. * **Hepatitis & Liver Failure (Hepatic):** In these conditions, the liver cannot efficiently re-excrete reabsorbed urobilinogen back into the bile. This causes more urobilinogen to be diverted to the kidneys, typically resulting in **normal or increased** urinary urobilinogen (unless there is significant intrahepatic cholestasis) [1]. **3. NEET-PG High-Yield Pearls:** * **"Clay-colored stools"** occur in obstructive jaundice because stercobilin (the derivative of urobilinogen) is absent in the feces [1]. * **Bilirubinuria vs. Urobilinogen:** In obstructive jaundice, urine contains **conjugated bilirubin** (making it dark/tea-colored) but **no urobilinogen** [1]. * **Van den Bergh Reaction:** Obstructive jaundice gives a **Direct Positive** reaction, while Hemolysis gives an **Indirect Positive** reaction [1].

Question 375: A 40-year-old chronic alcoholic presents with a distended abdomen, hematemesis, and fresh blood in the stool. On examination, huge ascites and distended veins over the abdominal wall are noted. What is the most likely cause of the hematemesis?

A. Esophagitis
B. Esophageal varices (Correct Answer)
C. Esophageal cancer
D. Erosion of the gastroduodenal artery

Explanation: ### Explanation The clinical presentation of a **chronic alcoholic** with **ascites** and **distended abdominal veins** (caput medusae) strongly suggests **Liver Cirrhosis** leading to **Portal Hypertension**. [1] **1. Why Esophageal Varices is correct:** In portal hypertension, the portal venous pressure increases (usually >10-12 mmHg). [1] To bypass the obstructed liver, blood is shunted into systemic circulation via porto-systemic anastomoses. The most clinically significant site is the lower esophagus, where the left gastric vein (portal) meets the esophageal veins (systemic). [1] These vessels become dilated and friable (varices). Rupture of these varices leads to painless, massive **hematemesis** and can cause **hematochezia** (fresh blood in stool) if the bleeding is brisk and transit time is rapid. [1] **2. Why other options are incorrect:** * **Esophagitis:** Usually presents with retrosternal burning and odynophagia. While it can cause mild bleeding (coffee-ground emesis), it does not cause massive hematemesis or correlate with signs of portal hypertension. * **Esophageal Cancer:** Typically presents with progressive dysphagia and weight loss in older patients. Bleeding is usually chronic (anemia) rather than acute massive hematemesis. * **Erosion of the Gastroduodenal Artery:** This is the classic complication of a **posterior duodenal ulcer**. While it causes massive bleeding, it would not explain the ascites or distended abdominal veins seen in this patient. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Upper GI Endoscopy (UGIE). [1] * **Immediate Management:** Hemodynamic stabilization + IV Octreotide/Terlipressin + Prophylactic Antibiotics (Ceftriaxone). * **Definitive Treatment:** Endoscopic Variceal Ligation (EVL). [1] * **Primary Prophylaxis:** Non-selective beta-blockers (Propranolol/Nadolol). * **SAAG Score:** In this patient, the Serum-Ascites Albumin Gradient (SAAG) would likely be **>1.1 g/dL**, indicating portal hypertension.

Question 376: All of the following are seen in Crohn's disease EXCEPT?

A. Poor perianal hygiene
B. Stricture formation
C. Crypt abscess
D. Rectum is commonly involved (Correct Answer)

Explanation: **Explanation:** The correct answer is **D (Rectum is commonly involved)** because rectal involvement is a hallmark of **Ulcerative Colitis (UC)** [2], not Crohn’s Disease (CD). In Crohn’s, the rectum is typically **spared**, and the disease is characterized by "skip lesions" (discontinuous involvement) anywhere from the mouth to the anus [1]. **Analysis of Options:** * **A. Poor perianal hygiene:** This is a clinical manifestation of Crohn’s disease due to the frequent occurrence of **perianal complications** such as fistulae, fissures, and skin tags [1]. These make local hygiene difficult and painful. * **B. Stricture formation:** Crohn’s is a **transmural** inflammatory process. Chronic inflammation leads to fibrosis and narrowing of the bowel lumen, commonly resulting in strictures and intestinal obstruction (the "string sign of Kantor" on imaging) [3]. * **C. Crypt abscess:** While more characteristic and numerous in Ulcerative Colitis, crypt abscesses (neutrophils in the crypt lumen) can still be seen in Crohn's disease during the active phase [2]. **NEET-PG High-Yield Pearls:** * **Most common site:** Terminal ileum (Ileocolic region). * **Pathology:** Non-caseating granulomas (pathognomonic), transmural inflammation, and "cobblestone" appearance. * **Serology:** ASCA (Anti-Saccharomyces cerevisiae antibodies) is positive in CD; p-ANCA is positive in UC. * **Smoking:** Increases the risk and severity of Crohn’s disease (conversely, it is protective in Ulcerative Colitis). * **Creeping Fat:** Mesenteric fat wraps around the bowel surface, a classic surgical finding in CD.

Question 377: Spontaneous Bacterial Peritonitis is indicated by the presence of which of the following in ascitic fluid?

A. Absolute lymphocyte count > 500 cells/mm³
B. Absolute PMN count > 500 cells/mm³
C. Absolute lymphocyte count > 250 cells/mm³
D. Absolute PMN count > 250 cells/mm³ (Correct Answer)

Explanation: **Explanation:** **Spontaneous Bacterial Peritonitis (SBP)** is an acute bacterial infection of ascitic fluid, typically occurring in patients with advanced cirrhosis. The diagnosis is primarily established through a diagnostic paracentesis. **Why Option D is correct:** The gold standard for diagnosing SBP is an **absolute polymorphonuclear leukocyte (PMN) count ≥ 250 cells/mm³** in the ascitic fluid. PMNs (neutrophils) are the primary responders to bacterial seeding of the peritoneum. This threshold has the highest sensitivity for identifying infection, even if the culture results are negative (referred to as Culture-Negative Neutrocytic Ascites). **Why other options are incorrect:** * **Options A & C:** Lymphocytes are the predominant cell type in conditions like **Tuberculous peritonitis** or peritoneal carcinomatosis [1]. In SBP, the inflammatory response is specifically neutrophilic, not lymphocytic. * **Option B:** While a PMN count > 500 cells/mm³ is certainly diagnostic of SBP, it is not the minimum diagnostic threshold. Using 500 as the cutoff would miss many early or less severe cases of SBP, leading to increased mortality. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organism:** *Escherichia coli* (followed by *Klebsiella pneumoniae*). * **Treatment of choice:** Third-generation cephalosporins (e.g., **Cefotaxime**). * **Albumin Therapy:** Administering IV albumin (1.5g/kg on day 1 and 1g/kg on day 3) reduces the risk of Hepatorenal Syndrome and mortality. * **Secondary Peritonitis vs. SBP:** Suspect secondary peritonitis (due to gut perforation) if the ascitic fluid shows multiple organisms on Gram stain, glucose < 50 mg/dL, or LDH > upper limit of normal for serum.

Question 378: A 65-year-old man presented with an episode of syncope. He reported feeling dizzy during defecation and noted gross bleeding in the toilet pan. A fecal occult blood test done 3 months prior as part of routine screening for colon cancer was negative. There is no history of recent weight loss. What is the likely colonoscopic finding?

A. Early stage carcinoma of the colon
B. Sigmoid diverticulitis
C. Microscopic colitis
D. Dilated mucosal and submucosal veins in the colon (Correct Answer)

Explanation: ### Explanation The clinical presentation of painless, massive hematochezia leading to syncope in an elderly patient is classic for **Angiodysplasia** (also known as vascular ectasia). **1. Why Option D is Correct:** Angiodysplasia consists of **dilated, tortuous mucosal and submucosal veins**, most commonly found in the cecum and ascending colon [1]. It is a common cause of lower GI bleeding in patients over 60. Unlike diverticular bleeding (which is arterial), angiodysplastic bleeding is typically venous and episodic. The fact that a fecal occult blood test (FOBT) was negative 3 months ago is consistent with this diagnosis [2], as angiodysplasia often causes intermittent bleeding rather than continuous oozing. **2. Why Other Options are Incorrect:** * **Option A:** While colon cancer can cause bleeding, it usually presents with chronic occult blood loss [1], iron deficiency anemia, or change in bowel habits. A negative FOBT 3 months ago and the absence of weight loss make an acute, massive syncopal bleed from carcinoma less likely [2]. * **Option B:** Sigmoid diverticulitis presents with left lower quadrant pain, fever, and leukocytosis. While *diverticulosis* is the most common cause of massive lower GI bleeding, *diverticulitis* (inflammation) rarely causes gross hemorrhage. * **Option C:** Microscopic colitis presents with chronic, watery, non-bloody diarrhea. The colonoscopic appearance is typically normal, and it does not cause gross hematochezia or syncope. **3. Clinical Pearls for NEET-PG:** * **Most common cause of massive lower GI bleed in elderly:** Diverticulosis. * **Second most common cause:** Angiodysplasia. * **Heyde’s Syndrome:** The triad of Aortic Stenosis, Angiodysplasia, and acquired von Willebrand deficiency. * **Diagnosis:** Colonoscopy is the initial test of choice; however, **Angiography** is the gold standard for identifying the site during active bleeding (shows a "tuft" of vessels) [1].

Question 379: A young patient presents with jaundice. Total bilirubin is 21 mg/dL, direct bilirubin is 9.6 mg/dL, and alkaline phosphatase is 84 KA units. What is the most likely diagnosis?

A. Hemolytic jaundice
B. Viral hepatitis
C. Chronic active hepatitis
D. Obstructive jaundice (Correct Answer)

Explanation: The diagnosis of jaundice in this patient is based on the biochemical profile, specifically the levels of bilirubin and Alkaline Phosphatase (ALP). [1] **1. Why Obstructive Jaundice is Correct:** The key indicator here is the **markedly elevated Alkaline Phosphatase (84 KA units)**. The normal range for ALP is 3–13 KA units (or 30–120 U/L). A value of 84 KA units represents a significant elevation ( >3–5 times the upper limit of normal), which is a hallmark of **cholestasis** or biliary obstruction [2]. Furthermore, the bilirubin profile shows a significant **Direct (conjugated) Bilirubin** component (9.6 mg/dL), which confirms that the liver is conjugating bilirubin, but it cannot be excreted into the bile ducts [2]. **2. Why the other options are incorrect:** * **Hemolytic Jaundice:** This presents with predominantly **indirect (unconjugated) hyperbilirubinemia** [1]. ALP levels remain normal because there is no biliary obstruction or hepatocyte damage. * **Viral Hepatitis:** While bilirubin is elevated, the primary laboratory finding is a massive rise in **transaminases (AST/ALT)** [1]. ALP may be mildly elevated but rarely reaches the high levels seen in obstructive cases. * **Chronic Active Hepatitis:** Similar to viral hepatitis, this is a hepatocellular pattern. While it can progress to cirrhosis and cause jaundice, the ALP elevation is typically disproportionately lower than the transaminase elevation. **3. NEET-PG High-Yield Pearls:** * **ALP Units:** Be careful with units. 1 KA (King-Armstrong) unit is roughly equivalent to 7.1 U/L. An ALP >30 KA units is highly suggestive of obstructive jaundice. * **Bilirubin Ratio:** In obstructive jaundice, the direct bilirubin is usually >50% of the total bilirubin. * **Courvoisier’s Law:** In a patient with obstructive jaundice, if the gallbladder is palpable, the obstruction is unlikely to be a stone (more likely a malignancy like periampullary carcinoma). * **Fractionation:** Always look at ALP first to differentiate between "Medical Jaundice" (Hepatocellular) and "Surgical Jaundice" (Obstructive).

Question 380: Which of the following is a specific marker for intestinal inflammation?

A. C-reactive protein
B. Fecal lactoferrin (Correct Answer)
C. Erythrocyte sedimentation rate
D. Leukocytosis

Explanation: The correct answer is **Fecal lactoferrin**. **Why Fecal Lactoferrin is the Correct Answer:** Lactoferrin is an iron-binding glycoprotein found primarily in the secondary granules of neutrophils. When inflammation occurs in the intestinal mucosa, neutrophils migrate to the site and degranulate, releasing lactoferrin into the feces. Because it is specifically released by leukocytes in the gut lumen, it serves as a highly sensitive and specific marker for **intestinal inflammation**. It is particularly useful in clinical practice to differentiate **Inflammatory Bowel Disease (IBD)** from non-inflammatory conditions like Irritable Bowel Syndrome (IBS). **Analysis of Incorrect Options:** * **A. C-reactive protein (CRP):** While CRP is an acute-phase reactant that rises during inflammation, it is a **systemic marker**. It can be elevated due to infections, trauma, or inflammation anywhere in the body (e.g., pneumonia, UTI), making it non-specific to the intestine. * **C. Erythrocyte sedimentation rate (ESR):** Similar to CRP, ESR is a non-specific indicator of systemic inflammation and is influenced by age, sex, and red blood cell morphology. * **D. Leukocytosis:** An elevated white blood cell count indicates an immune response but does not localize the site of pathology [1]. It can occur in any systemic infection or inflammatory state. **NEET-PG High-Yield Pearls:** * **Fecal Calprotectin:** Another highly specific marker for intestinal inflammation (often tested alongside lactoferrin). It is a calcium-binding protein derived from neutrophils. * **Clinical Utility:** These markers are used to monitor IBD activity and predict relapses [2]. * **Rule of Thumb:** If a patient has chronic diarrhea but **normal** fecal calprotectin/lactoferrin, the diagnosis is likely **IBS** rather than IBD.

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

Practice Questions

Malabsorption Syndromes

Practice Questions

Pancreatitis (Acute and Chronic)

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Liver Diseases and Cirrhosis

Practice Questions

Viral Hepatitis

Practice Questions

Biliary Tract Disorders

Practice Questions

Gastrointestinal Motility Disorders

Practice Questions

Gastrointestinal Malignancies

Practice Questions

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