Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 451: What is Dieulafoy's lesion?

A. Prolapse gastropathy
B. Gastric antral vascular ectasia
C. Gastric hemorrhagic telangiectasias
D. An aberrant vessel in the submucosa that bleeds from a mucosal defect (Correct Answer)

Explanation: **Explanation:** **Dieulafoy’s lesion** is a rare but life-threatening cause of gastrointestinal bleeding. It is characterized by a **large-caliber, persistent tortuous submucosal artery** that fails to taper as it reaches the mucosa. This aberrant vessel eventually erodes the overlying epithelium, leading to a small mucosal defect (usually 2–5 mm) and subsequent massive arterial hemorrhage. **Why the correct answer is right:** Option D accurately describes the pathophysiology. Unlike typical peptic ulcers, there is no primary mucosal ulceration; the bleeding occurs because an abnormally large vessel (the "caliber-persistent artery") protrudes through a tiny, otherwise healthy-looking mucosal surface. **Why the incorrect options are wrong:** * **A. Prolapse gastropathy:** This refers to subepithelial hemorrhage caused by the invagination of the gastric mucosa into the esophagus during forceful vomiting. * **B. Gastric Antral Vascular Ectasia (GAVE):** Also known as "Watermelon Stomach," this involves dilated small vessels in the antrum, typically presenting as chronic occult bleeding rather than acute arterial spurting. * **C. Gastric hemorrhagic telangiectasias:** These are small, dilated capillary vessels (often seen in Osler-Weber-Rendu syndrome) rather than a single large submucosal artery. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most commonly found in the **Lesser Curvature of the stomach** (within 6 cm of the gastroesophageal junction). * **Clinical Presentation:** Presents as sudden, painless, massive hematemesis or melena. * **Diagnosis:** Endoscopy is the gold standard, though it can be difficult to spot if the lesion is not actively bleeding. * **Management:** Endoscopic therapy (clipping, thermocoagulation, or epinephrine injection) is the first-line treatment [1]. Surgical wedge resection is reserved for refractory cases.

Question 452: Which of the following is NOT a feature of Celiac disease?

A. Diarrhea, malabsorption, and iron deficiency anemia are common symptoms.
B. It is a condition characterized by sensitivity to gluten.
C. Individuals with Celiac disease often express HLA DQ2 or DQ8.
D. Biopsy findings are pathognomonic for the disease. (Correct Answer)

Explanation: **Explanation:** The correct answer is **D**. While small bowel biopsy is a cornerstone of diagnosis, the findings (villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes) are **not pathognomonic** [1]. These histological features can also be seen in Tropical Sprue, Giardiasis, Common Variable Immunodeficiency (CVID), and Autoimmune Enteropathy. Diagnosis requires a combination of clinical features, positive serology (anti-tTG IgA), and biopsy findings that improve on a gluten-free diet [1]. **Analysis of Incorrect Options:** * **Option A:** Celiac disease typically presents with malabsorptive symptoms [1]. Iron deficiency anemia (refractory to oral iron) is a classic "silent" presentation due to primary involvement of the duodenum, where iron is absorbed [1]. * **Option B:** It is an immune-mediated enteropathy triggered by the ingestion of **gluten** (specifically the gliadin fraction) found in wheat, barley, and rye [1]. * **Option C:** Over 95% of patients express **HLA-DQ2** (most common) or **HLA-DQ8** [1]. The absence of these alleles has a high negative predictive value, effectively ruling out the disease. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Small bowel biopsy (D2 part of the duodenum). * **Best Initial Screening Test:** IgA Anti-tissue Transglutaminase (anti-tTG) antibody. * **Dermatological Association:** **Dermatitis Herpetiformis** (itchy, vesicular rash on extensors; biopsy shows IgA deposits at dermal papillae). * **Associated Malignancy:** Increased risk of **Enteropathy-associated T-cell lymphoma (EATL)**. * **Marsh Classification:** Used to grade the severity of histological changes on biopsy.

Question 453: A 50-year-old male presented with a history of hematemesis of 500ml of blood. On examination, his BP was 90/60 mmHg, PR was 110 bpm, and he had splenomegaly 5 cm below the lower costal margin. What is the most probable diagnosis?

A. Mallory-Weiss tear
B. Duodenal ulcer
C. Gastritis
D. Portal hypertension (Correct Answer)

Explanation: ### Explanation The correct diagnosis is **Portal Hypertension**, likely leading to esophageal variceal bleeding [1]. **1. Why Portal Hypertension is correct:** The clinical presentation features a classic triad: **Massive Hematemesis** (500ml), **Hemodynamic Instability** (Hypotension 90/60 mmHg and Tachycardia 110 bpm), and **Splenomegaly** [2]. In the context of upper GI bleeding, the presence of splenomegaly is a hallmark sign of portal hypertension (congestive splenomegaly) [3]. This suggests that the bleeding source is most likely esophageal or gastric varices resulting from underlying cirrhosis or non-cirrhotic portal fibrosis [1]. **2. Why other options are incorrect:** * **Mallory-Weiss tear:** This involves a mucosal tear at the gastroesophageal junction, typically following forceful vomiting or retching. While it causes hematemesis, it is **not associated with splenomegaly**. * **Duodenal Ulcer:** This is a common cause of upper GI bleed (peptic ulcer disease). However, it does not cause splenomegaly unless there is a co-existing liver disease. * **Gastritis:** Erosive gastritis can cause hematemesis, but the bleeding is usually less massive, and like the other incorrect options, it **does not explain the presence of an enlarged spleen**. **Clinical Pearls for NEET-PG:** * **Splenomegaly + Hematemesis = Portal Hypertension** until proven otherwise [2]. * **Initial Management:** The first step in any massive hematemesis is hemodynamic stabilization (IV fluids/resuscitation), followed by an urgent Upper GI Endoscopy [2]. * **Drug of Choice:** Octreotide or Terlipressin is used to reduce portal pressure in suspected variceal bleeds. * **Prophylaxis:** Propranolol (non-selective beta-blocker) is used for primary prophylaxis of variceal bleeding.

Question 454: Which of the following cereals can be safely consumed by patients with Celiac disease?

A. Wheat
B. Barley
C. Maize (Correct Answer)
D. Rye

Explanation: Explanation: Celiac disease is an immune-mediated enteropathy triggered by the ingestion of **gluten** in genetically susceptible individuals (carrying HLA-DQ2 or HLA-DQ8). [1] Gluten is a complex of proteins found in specific grains that triggers an inflammatory response, leading to villous atrophy and malabsorption. [1] **Why Maize is Correct:** Maize (corn) and rice are safe for patients with Celiac disease because they do not contain the specific toxic prolamins that trigger the autoimmune response. Patients are advised to follow a strict lifelong **Gluten-Free Diet (GFD)**, which includes maize, rice, millet, sorghum, buckwheat, and quinoa. [1] **Why the Other Options are Incorrect:** The "toxic" grains in Celiac disease contain specific prolamins that are rich in proline and glutamine, which are resistant to enzymatic digestion: * **Wheat:** Contains **Gliadin** (the most potent trigger). [1] * **Barley:** Contains **Hordein**. [1] * **Rye:** Contains **Secalin**. [1] * *(Note: Oats contain **Avenin**, which is generally tolerated by most, but often cross-contaminated during processing).* [1] **NEET-PG High-Yield Pearls:** * **Mnemonic for Toxic Grains:** **BROW** (Barley, Rye, Oats*, Wheat). * **Gold Standard Diagnosis:** Endoscopic small bowel biopsy showing **Villous atrophy**, Crypt hyperplasia, and increased Intraepithelial lymphocytes (Marsh Classification). [1] * **Best Screening Test:** IgA anti-tissue Transglutaminase (**anti-tTG**) antibody. [1] * **Associated Conditions:** Dermatitis herpetiformis (pathognomonic skin manifestation), Type 1 Diabetes, and IgA deficiency. * **Long-term Complication:** Increased risk of **Enteropathy-associated T-cell lymphoma (EATL)** if the diet is not strictly followed.

Question 455: Which of the following conditions is NOT associated with Primary Sclerosing Cholangitis (PSC)?

A. Ulcerative colitis
B. Idiopathic thrombocytopenic purpura (Correct Answer)
C. Sarcoidosis
D. Retroperitoneal fibrosis

Explanation: **Explanation:** Primary Sclerosing Cholangitis (PSC) is a chronic cholestatic liver disease characterized by inflammation and "onion-skin" fibrosis [1] of the intrahepatic and extrahepatic bile ducts. It is strongly associated with various autoimmune and fibroinflammatory conditions. **Why Option B is Correct:** **Idiopathic Thrombocytopenic Purpura (ITP)** is an isolated hematological autoimmune disorder characterized by low platelet counts. While PSC is associated with several autoimmune conditions, there is no established clinical or pathophysiological link between PSC and ITP. **Why the other options are Incorrect:** * **Ulcerative Colitis (UC):** This is the most common association. Approximately 70-80% of patients with PSC have coexisting Inflammatory Bowel Disease (IBD), most commonly UC [1]. * **Sarcoidosis:** PSC is known to coexist with other granulomatous and systemic inflammatory diseases, including sarcoidosis. * **Retroperitoneal Fibrosis:** PSC is part of the spectrum of **IgG4-related systemic diseases**. It is frequently associated with other fibrotic conditions such as retroperitoneal fibrosis (Ormond’s disease), Riedel’s thyroiditis, and mediastinal fibrosis. **NEET-PG High-Yield Pearls:** 1. **Gold Standard Investigation:** Magnetic Resonance Cholangiopancreatography (MRCP) showing a characteristic **"beaded appearance"** (multifocal strictures and dilations). 2. **Antibody Marker:** **p-ANCA** is positive in about 60-80% of cases (though not specific) [1], [2]. 3. **Malignancy Risk:** PSC significantly increases the risk of **Cholangiocarcinoma** (10-15% lifetime risk) and Colorectal Cancer (due to associated UC). 4. **Liver Biopsy:** Classically shows **"onion-skin fibrosis"** (periductal concentric fibrosis). 5. **Treatment:** Liver transplantation is the only definitive treatment for end-stage PSC.

Question 456: Thickened gastric folds are not seen in which of the following conditions?

A. Carcinoma stomach
B. Menetrier disease
C. Eosinophilic gastritis
D. Peptic ulcer disease (Correct Answer)

Explanation: **Explanation:** The presence of thickened gastric folds (giant rugal hypertrophy) on endoscopy or imaging is a specific radiological and endoscopic sign indicating infiltrative, inflammatory, or hyperplastic processes within the gastric wall. **Why Peptic Ulcer Disease (PUD) is the correct answer:** In **Peptic Ulcer Disease**, the primary pathology is a focal mucosal defect (ulcer) that extends through the muscularis mucosae [2]. While there may be localized edema or radiating folds (converging towards the ulcer crater), PUD does **not** cause generalized or diffuse thickening of the gastric folds. Therefore, it is the outlier among the options. **Analysis of Incorrect Options:** * **Carcinoma Stomach:** Specifically, **Linitis Plastica** (diffuse-type adenocarcinoma) causes significant infiltration of the submucosa, leading to rigid, thickened folds and a "leather bottle" appearance of the stomach. * **Menetrier Disease:** This is a classic "high-yield" cause of massive gastric fold thickening. It is a hyperproliferative gastropathy characterized by hyperplasia of surface mucous cells (foveolar hyperplasia), leading to protein loss (hypoproteinemia) and TGF-alpha overexpression. * **Eosinophilic Gastritis:** This is an inflammatory condition where eosinophils infiltrate the gastric wall layers. Submucosal involvement typically results in prominent, thickened, and edematous gastric folds. **NEET-PG High-Yield Pearls:** 1. **Mnemonic for Thickened Gastric Folds (MICE):** **M**enetrier’s, **I**nfiltration (Lymphoma/Carcinoma), **C**rohn’s/CMV, **E**osinophilic gastritis (or **Z**ollinger-Ellison Syndrome) [1]. 2. **Menetrier Disease Key:** Look for "corkscrew" glands, hypoalbuminemia (protein-losing gastropathy), and increased risk of gastric adenocarcinoma. 3. **Zollinger-Ellison Syndrome (ZES):** Thickened folds here are due to the trophic effect of excessive gastrin on parietal cells [2]. 4. **Linitis Plastica:** Associated with *CDH1* gene mutations and signet ring cells.

Question 457: Which oral lesion is associated with ulcerative colitis?

A. Pemphigus
B. Scleroderma
C. Sarcoidosis
D. Pyostomatitis vegetans (Correct Answer)

Explanation: **Explanation:** **Pyostomatitis vegetans (PV)** is a rare, highly specific oral manifestation of Inflammatory Bowel Disease (IBD), most commonly associated with **Ulcerative Colitis (UC)** (and occasionally Crohn’s disease). It is considered the oral counterpart of *Pyoderma gangrenosum*. * **Mechanism:** It is characterized by multiple "snail-track" ulcers (friable, yellowish-white pustules) on an erythematous base in the oral mucosa. These lesions often mirror the activity of the intestinal disease; they flare when the colitis is active and typically resolve once the underlying UC is treated or a colectomy is performed. **Analysis of Incorrect Options:** * **Pemphigus:** This is an autoimmune blistering disorder (Type II hypersensitivity) involving antibodies against desmogleins. While it causes oral ulcers, it has no specific association with UC. * **Scleroderma:** Characterized by microvascular damage and fibrosis. Oral findings include a widened periodontal ligament space and microstomia (limited mouth opening), not vegetative pustules. * **Sarcoidosis:** A multisystem granulomatous disease. Oral involvement is rare but usually presents as asymptomatic nodules or salivary gland enlargement (Heerfordt syndrome), not pustular lesions. **NEET-PG High-Yield Pearls:** * **Most common oral lesion in IBD:** Aphthous ulcers (seen in both UC and Crohn’s). * **Most specific oral lesion for UC:** Pyostomatitis vegetans. * **Skin counterpart:** Pyoderma gangrenosum (associated with UC) and Erythema nodosum (more common in Crohn’s). * **Histology of PV:** Intraepithelial abscesses filled with **eosinophils** and neutrophils.

Question 458: Regarding hepatic encephalopathy, which of the following statements is TRUE or FALSE?

A. Statement 1 is True, Statement 2 is True, Statement 3 is True, and Statement 5 is True, while Statement 4 is False.
B. Statement 1 is True, Statement 2 is True, and Statement 5 is True, while Statement 3 is False and Statement 4 is False.
C. Statement 1 is True and Statement 5 is True, while Statement 2 is False, Statement 3 is False, and Statement 4 is False. (Correct Answer)
D. Statement 1 is True, Statement 2 is True, and Statement 5 is True, while Statement 3 is False and Statement 4 is False.

Explanation: **Hepatic Encephalopathy (HE)** is a reversible neuropsychiatric syndrome resulting from liver failure or portosystemic shunting, primarily driven by the accumulation of neurotoxins like **ammonia** [1]. ### **Analysis of Statements** * **Statement 1 (True):** Ammonia is the primary toxin. It crosses the blood-brain barrier and is converted to **glutamine** by astrocytes. This osmotic shift causes astrocyte swelling and cerebral edema [1]. * **Statement 2 (False):** Flumazenil is a GABA-A receptor antagonist. While it may provide transient improvement in some patients (suggesting a role for endogenous benzodiazepines), it is **not** a standard or definitive treatment for HE. * **Statement 3 (False):** Neomycin is an aminoglycoside used to decrease ammonia-producing bacteria. However, it is **not** the first-line treatment due to risks of ototoxicity and nephrotoxicity. **Lactulose** remains the first-line therapy. * **Statement 4 (False):** Protein restriction is **no longer recommended**. Malnutrition is common in cirrhosis [2]; patients require 1.2–1.5 g/kg/day of protein to prevent muscle wasting, which actually worsens hyperammonemia. * **Statement 5 (True):** **Lactulose** works by acidifying the colonic lumen (converting $NH_3$ to non-absorbable $NH_4^+$) and acting as an osmotic laxative to expel nitrogenous waste. ### **Why Option C is Correct** Option C correctly identifies that only Statements 1 and 5 are medically accurate. Statements 2, 3, and 4 represent outdated or secondary clinical practices. ### **High-Yield NEET-PG Pearls** * **First-line Treatment:** Lactulose (titrated to 2–3 soft stools/day). * **Second-line/Add-on:** Rifaximin (non-absorbable antibiotic). * **Precipitating Factors:** GI bleed (most common), infection (SBP), constipation, hypokalemia, and dehydration. * **Clinical Sign:** **Asterixis** (negative myoclonus) is characteristic but not pathognomonic. * **West Haven Criteria:** Used for grading the severity of HE (Grade I to IV).

Question 459: Which of the following conditions does not cause secretory diarrhea?

A. Medullary carcinoma of the thyroid
B. Somatostatinoma (Correct Answer)
C. Carcinoid syndrome
D. Zollinger-Ellison syndrome

Explanation: ### Explanation The key to distinguishing types of diarrhea lies in the pathophysiology of fluid transport. **Secretory diarrhea** occurs when there is active secretion of electrolytes (mainly sodium and chloride) into the intestinal lumen, often mediated by hormones or toxins, leading to high-volume watery stools that do not resolve with fasting [1]. **Why Somatostatinoma is the correct answer:** Somatostatin is a potent **inhibitory hormone**. It inhibits the secretion of various gastrointestinal hormones (gastrin, insulin, glucagon) and reduces pancreatic and biliary secretions [2]. In a somatostatinoma, the excess somatostatin leads to **steatorrhea** (malabsorptive diarrhea) rather than secretory diarrhea. This occurs because somatostatin inhibits pancreatic enzyme secretion and gallbladder contraction, leading to fat maldigestion. The classic triad for Somatostatinoma is **Diabetes mellitus, Cholelithiasis, and Steatorrhea.** **Analysis of Incorrect Options:** * **Medullary Carcinoma of Thyroid (MCT):** These tumors secrete **Calcitonin** and other secretagogues (like prostaglandins), which stimulate intestinal secretion, causing secretory diarrhea. * **Carcinoid Syndrome:** Metastatic carcinoid tumors release **Serotonin** and bradykinins into the systemic circulation, which increase intestinal motility and stimulate fluid secretion [3]. * **Zollinger-Ellison Syndrome (ZES):** While primarily known for peptic ulcers, the massive hypergastrinemia causes excessive gastric acid production [2]. This low pH inactivates pancreatic enzymes and damages the intestinal mucosa, but gastrin itself also acts as a secretagogue, contributing to a secretory component. **High-Yield Clinical Pearls for NEET-PG:** * **Secretory Diarrhea:** Stool osmotic gap is **low (<50 mOsm/kg)**; diarrhea persists during fasting. * **Osmotic Diarrhea:** Stool osmotic gap is **high (>125 mOsm/kg)**; diarrhea stops with fasting (e.g., Lactose intolerance). * **VIPoma (WDHA Syndrome):** The classic cause of massive secretory diarrhea, also known as "Pancreatic Cholera" [1].

Question 460: Non-tropical sprue is characterized by?

A. Elongation of intestinal villi
B. Currant jelly stools
C. Hypertriglyceridemia
D. Poor absorption of lipids (Correct Answer)

Explanation: **Explanation:** **Non-tropical sprue**, also known as **Celiac Disease** or gluten-sensitive enteropathy, is an immune-mediated inflammatory disorder triggered by the ingestion of gluten. **Why Option D is correct:** The hallmark of non-tropical sprue is immune-mediated damage to the small intestinal mucosa, leading to **villous atrophy** and crypt hyperplasia. This destruction significantly reduces the surface area available for nutrient absorption. Since lipid digestion and absorption are complex processes requiring a large surface area and intact mucosal enzymes, **malabsorption of lipids (steatorrhea)** is a primary clinical feature. Patients typically present with foul-smelling, bulky, oily stools. **Why the other options are incorrect:** * **Option A:** In non-tropical sprue, there is **blunting or total atrophy** of the villi, not elongation. Elongation occurs in the crypts (crypt hyperplasia) as a compensatory mechanism. * **Option B:** **Currant jelly stools** are characteristic of **Intussusception**, caused by the mixture of mucus and blood. * **Option C:** Patients with malabsorption typically present with **hypolipidemia** (low cholesterol and triglycerides) because they cannot absorb dietary fats. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Small intestinal biopsy showing villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes (Marsh Criteria). * **Serology:** Anti-tissue transglutaminase (anti-tTG) IgA is the screening drug of choice. Anti-endomysial antibody (EMA) is the most specific. * **Genetic Association:** Strongly linked with **HLA-DQ2** (95%) and **HLA-DQ8**. * **Associated Condition:** Dermatitis herpetiformis (itchy, bullous skin lesions). * **Malignancy Risk:** Increased risk of Enteropathy-associated T-cell lymphoma (EATL).

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

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