Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 241: A 19-year-old man presents with a long history of weight loss, abdominal distention, bloating, and diarrhea. Investigations reveal steatorrhea, and a small bowel biopsy shows blunting and flattening of villi. What is the most likely diagnosis?

A. Celiac disease (Correct Answer)
B. Gastrinoma
C. Hyperthyroidism
D. Associated with skin pigmentation

Explanation: The clinical presentation of chronic diarrhea, weight loss, and steatorrhea in a young adult, combined with the classic histopathological finding of **villous atrophy (blunting and flattening of villi)**, is hallmark for **Celiac Disease**. [1] **1. Why Celiac Disease is correct:** Celiac disease is an immune-mediated enteropathy triggered by gluten ingestion in genetically predisposed individuals (HLA-DQ2/DQ8). The immune response causes mucosal inflammation leading to: * **Villous atrophy:** Loss of absorptive surface area. [1] * **Crypt hyperplasia:** Increased cell turnover. [1] * **Intraepithelial lymphocytosis:** Increased CD8+ T cells. This malabsorption results in steatorrhea (fatty stools) and nutritional deficiencies. [3] **2. Why other options are incorrect:** * **Gastrinoma (Zollinger-Ellison Syndrome):** While it can cause diarrhea due to intestinal acidification inactivating pancreatic enzymes, it typically presents with refractory peptic ulcers and would not show villous flattening on biopsy. * **Hyperthyroidism:** Causes increased frequency of bowel movements (hypermotility) rather than true malabsorptive steatorrhea or structural villous damage. * **Associated with skin pigmentation (Whipple’s Disease):** Whipple’s disease presents with malabsorption and hyperpigmentation [2], but the biopsy would show **PAS-positive macrophages** and dilated lacteals, not isolated villous flattening [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Small bowel biopsy (D2/distal duodenum). * **Serology:** Anti-tissue Transglutaminase (tTG) IgA is the best screening test; Anti-Endomysial Antibody (EMA) is the most specific. * **Associated Condition:** Dermatitis Herpetiformis (itchy, vesicular skin rash). * **Complications:** Increased risk of Enteropathy-associated T-cell lymphoma (EATL) and small bowel adenocarcinoma.

Question 242: Sudden hematemesis in a patient with a history of alcohol use and a mucosal tear is characteristic of which condition?

A. Mallory-Weiss syndrome (Correct Answer)
B. Dieulafoy's lesion
C. Boerhaave syndrome
D. Dysphagia lusoria

Explanation: **Mallory-Weiss Syndrome (MWS)** is the correct answer. It is characterized by a **longitudinal mucosal laceration** (tear) at the gastroesophageal junction or distal esophagus. The classic presentation involves a patient with a history of forceful vomiting, retching, or coughing (often following **alcohol binge**) which leads to a sudden increase in intra-abdominal pressure. This pressure causes the mucosa to tear, resulting in painless hematemesis. **Analysis of Incorrect Options:** * **Dieulafoy's Lesion:** This involves a large, tortuous **submucosal artery** that erodes the overlying epithelium. It causes massive, intermittent GI bleeding but is not associated with mucosal tears or forceful retching. * **Boerhaave Syndrome:** This is a **full-thickness transmural perforation** of the esophagus, usually following forceful vomiting. Unlike MWS, it presents with excruciating chest pain, subcutaneous emphysema, and shock (Mackler’s Triad) rather than simple hematemesis. * **Dysphagia Lusoria:** This is a structural cause of dysphagia caused by an **aberrant right subclavian artery** compressing the esophagus [1]. It does not present with hematemesis or mucosal tears. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most commonly located just below the Z-line (gastric side of the GE junction). * **Diagnosis:** Gold standard is **Upper GI Endoscopy (UGIE)**, which shows linear mucosal tears [1]. * **Management:** Most cases (approx. 80-90%) stop bleeding spontaneously. Active bleeding is managed endoscopically with epinephrine injection, clipping, or thermal coagulation. * **Risk Factors:** Alcoholism is the strongest association; also seen in hyperemesis gravidarum and eating disorders.

Question 243: A 45-year-old man with a long history of alcohol intake presents with upper gastrointestinal bleeding. Urgent upper GI endoscopy reveals dilated, tortuous, bluish submucosal veins in the lower esophagus. What is the most likely diagnosis?

A. Esophageal varices (Correct Answer)
B. Esophageal carcinoma
C. Foreign body
D. Tertiary esophageal contractions

Explanation: ***Esophageal varices*** - Chronic alcohol intake leads to **alcoholic cirrhosis** → **portal hypertension** → development of **esophageal varices** as portosystemic collaterals. - Endoscopy reveals **dilated, tortuous veins** in the lower esophagus that are prone to rupture, causing **massive upper GI bleeding**. *Esophageal carcinoma* - Typically presents with **progressive dysphagia** and **weight loss** over months, not acute bleeding. - Endoscopic appearance shows **ulcerative or exophytic masses**, not the dilated venous structures seen in varices. *Foreign body* - Usually presents with **acute onset dysphagia** or **odynophagia** following ingestion of a specific object. - Endoscopy would reveal the **actual foreign object** lodged in the esophagus, not findings suggestive of chronic liver disease. *Tertiary esophageal contractions* - Represents **non-peristaltic, simultaneous contractions** causing chest pain or dysphagia, not bleeding. - This is a **motility disorder** diagnosed by manometry, not associated with upper GI hemorrhage or chronic alcoholism.

Question 244: Which of the following is NOT a test for malabsorption syndrome?

A. D-Xylose absorption test
B. Fecal fat estimation
C. Urine aminoaciduria (Correct Answer)
D. Breath Hydrogen test

Explanation: **Explanation:** Malabsorption syndrome refers to the inability of the gastrointestinal tract to absorb nutrients (fats, carbohydrates, proteins, vitamins, and minerals) into the bloodstream. **Why "Urine aminoaciduria" is the correct answer:** Aminoaciduria refers to the presence of amino acids in the urine. This is typically a feature of **renal tubular disorders** (e.g., Fanconi syndrome) or **inborn errors of metabolism** (e.g., Hartnup disease, Cystinuria), rather than a failure of intestinal absorption. While protein malabsorption occurs in the gut, it is diagnosed via fecal alpha-1 antitrypsin levels [1] or serum albumin, not by measuring urinary amino acids. **Analysis of incorrect options:** * **D-Xylose absorption test:** A classic test to differentiate **mucosal disease** (e.g., Celiac disease) from pancreatic insufficiency. Since D-xylose is a monosaccharide absorbed by intact mucosa without needing pancreatic enzymes, low urinary excretion indicates intestinal mucosal damage. * **Fecal fat estimation:** The **Gold Standard** for diagnosing steatorrhea (fat malabsorption) [1]. The 72-hour fecal fat collection (Sudan III stain or Van de Kamer titration) is used to confirm malabsorption. * **Breath Hydrogen test:** Used to diagnose **carbohydrate malabsorption** (e.g., Lactose intolerance) and Small Intestinal Bacterial Overgrowth (SIBO) [2]. Undigested carbohydrates are fermented by colonic bacteria, producing hydrogen gas which is exhaled [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Best Screening Test for Malabsorption:** Sudan III staining of stool. * **Gold Standard for Fat Malabsorption:** 72-hour fecal fat estimation (>7g/day is abnormal). * **D-Xylose Test:** Remains normal in Pancreatic Insufficiency but is abnormal in Celiac Disease. * **Schilling Test:** Historically used for Vitamin B12 malabsorption (now largely replaced by anti-IF antibodies and MMA levels).

Question 245: Ulcerative colitis and Crohn's disease are associated with all of the following conditions EXCEPT?

A. Wiskott Aldrich Syndrome
B. Turner's syndrome
C. Glycogen storage diseases Type III (Correct Answer)
D. Hermansky Pudlak Syndrome

Explanation: **Explanation:** The correct answer is **Glycogen Storage Disease (GSD) Type III**. Inflammatory Bowel Disease (IBD), encompassing Ulcerative Colitis and Crohn’s disease, is known to have strong genetic associations with several systemic syndromes [1]. However, among the Glycogen Storage Diseases, it is **GSD Type Ib** (deficiency of glucose-6-phosphate translocase) that is classically associated with Crohn’s-like enterocolitis, primarily due to associated neutropenia and neutrophil dysfunction. **GSD Type III (Forbes-Cori disease)** involves a deficiency of the debranching enzyme and primarily affects the liver and muscles, with no established clinical association with IBD. **Analysis of other options:** * **Wiskott-Aldrich Syndrome:** This X-linked immunodeficiency (triad of eczema, thrombocytopenia, and infections) is frequently associated with early-onset colitis that mimics the clinical and histological features of Ulcerative Colitis. * **Turner’s Syndrome (45, XO):** There is a well-documented increased risk (approximately 2 to 3-fold) of both Ulcerative Colitis and Crohn’s disease in these patients, likely due to various immunological factors related to the X chromosome. * **Hermansky-Pudlak Syndrome:** This is a rare autosomal recessive disorder characterized by oculocutaneous albinism and platelet dysfunction. A significant subset of these patients develops a granulomatous colitis that is pathologically indistinguishable from Crohn’s disease. **NEET-PG High-Yield Pearls:** * **GSD Type Ib:** Remember the "Crohn’s-like" presentation due to neutropenia. * **Other IBD associations:** Common Variable Immunodeficiency (CVID), Chronic Granulomatous Disease (CGD), and IPEX syndrome [1]. * **Most common extra-intestinal manifestation of IBD:** Peripheral arthritis (Type 1 is pauciarticular; Type 2 is polyarticular) [1]. **Note on Pathology:** In both diseases, the intestinal wall is infiltrated with acute and chronic inflammatory cells with important differences in distribution [1].

Question 246: Which of the following is an uncommon cause of upper gastrointestinal bleeding?

A. Varices
B. Erosive gastritis
C. Peptic ulcer
D. Carcinoma of the stomach (Correct Answer)

Explanation: **Explanation:** Upper Gastrointestinal Bleeding (UGIB) is a common medical emergency [1]. To answer this question, one must distinguish between the **most common** causes and those that are statistically **uncommon**. **Why Option D is Correct:** While **Carcinoma of the stomach** can present with chronic occult blood loss (leading to iron deficiency anemia) or "coffee-ground" emesis, it is an **uncommon cause of acute, massive UGIB**. It accounts for only about 1% to 2% of all UGIB cases. Bleeding in malignancy usually occurs due to surface erosions or friable tumor vascularity rather than the rapid erosion of a major vessel. **Why the Other Options are Incorrect:** * **Peptic Ulcer (Option C):** This is the **most common cause** of UGIB worldwide, accounting for approximately 50% of cases. It includes both gastric and duodenal ulcers. * **Erosive Gastritis (Option B):** Also known as hemorrhagic gastritis, this is a frequent cause of UGIB, often secondary to NSAID use, alcohol consumption, or severe physiological stress (Stress ulcers) [1]. * **Varices (Option A):** Esophageal and gastric varices are common causes of UGIB, particularly in patients with portal hypertension/cirrhosis. While less frequent than peptic ulcers, they are a leading cause of massive, life-threatening hemorrhage. **NEET-PG High-Yield Pearls:** 1. **Most common cause of UGIB:** Peptic Ulcer Disease (specifically Duodenal Ulcers). 2. **Most common cause of Lower GI Bleed:** Diverticulosis (in adults) and Meckel’s Diverticulum (in children). 3. **Dieulafoy’s Lesion:** An uncommon but important cause of massive UGIB caused by a large submucosal artery that erodes through the mucosa. 4. **Rockall Score & Blatchford Score:** Clinical scoring systems used to predict mortality and the need for intervention in UGIB [1].

Question 247: Characteristic autoantibodies of autoimmune hepatitis include all of the following, except?

A. Antinuclear Antibodies (ANA)
B. Anti-SLA
C. Anti-LKM1
D. ANCA (Correct Answer)

Explanation: **Explanation:** Autoimmune Hepatitis (AIH) is a chronic inflammatory liver disease characterized by hypergammaglobulinemia and the presence of specific autoantibodies. The classification of AIH is primarily based on these antibody profiles. **Why ANCA is the correct answer:** While **p-ANCA** (Perinuclear Anti-Neutrophilic Cytoplasmic Antibodies) can sometimes be found in Type 1 AIH, it is **not a characteristic or diagnostic marker** for the disease [1]. p-ANCA is more classically associated with **Primary Sclerosing Cholangitis (PSC)** and Ulcerative Colitis [1]. In the context of this question, the other three options are the defining serological markers used to classify AIH. **Analysis of incorrect options:** * **Antinuclear Antibodies (ANA):** These are the most common markers for **Type 1 AIH** (along with Anti-Smooth Muscle Antibodies/ASMA) [2]. Type 1 is the most common form worldwide, affecting all ages. * **Anti-LKM1 (Liver-Kidney Microsome type 1):** This is the hallmark of **Type 2 AIH**. It typically affects children and adolescents and often follows a more severe clinical course. * **Anti-SLA (Soluble Liver Antigen):** This is highly specific for AIH. It is found in some patients who are negative for ANA and ASMA, sometimes referred to as "Type 3 AIH" (though now usually grouped under Type 1). **NEET-PG High-Yield Pearls:** * **Type 1 AIH:** ANA (+), ASMA (+), Anti-SLA (+). * **Type 2 AIH:** Anti-LKM1 (+), Anti-LC1 (Liver Cytosol type 1) (+). * **Drug of Choice:** Corticosteroids (Prednisolone) alone or in combination with Azathioprine. * **Histology:** Look for **"Interface Hepatitis"** (piecemeal necrosis) and a plasma cell-rich infiltrate.

Question 248: A patient presents with lower gastrointestinal bleed. Sigmoidoscopy shows ulcers in the sigmoid. Biopsy from this area shows flask-shaped ulcers. Which of the following is the most appropriate treatment?

A. Intravenous ceftriaxone
B. Intravenous metronidazole (Correct Answer)
C. Intravenous steroids and sulphasalazine
D. Hydrocortisone enemas

Explanation: **Explanation:** The clinical presentation of lower gastrointestinal bleeding combined with the pathognomonic finding of **flask-shaped ulcers** on biopsy is diagnostic of **Amoebic Colitis**, caused by *Entamoeba histolytica*. [1] 1. **Why Intravenous Metronidazole is correct:** *Entamoeba histolytica* trophozoites secrete proteolytic enzymes (histolysins) that breach the colonic mucosa. Once they reach the submucosa, they spread laterally, creating the characteristic narrow-necked, wide-based "flask-shaped" ulcer. **Metronidazole** (or Tinidazole) is the drug of choice as it is a potent tissue amoebicide that kills the invasive trophozoites. In cases of active GI bleed or severe colitis, the intravenous route is preferred to ensure rapid therapeutic levels. 2. **Why other options are incorrect:** * **Option A:** Ceftriaxone is a third-generation cephalosporin used for bacterial infections (like enteric fever or peritonitis) but has no activity against protozoa like *E. histolytica*. * **Options C & D:** Steroids and Sulphasalazine are used to treat Inflammatory Bowel Disease (IBD), specifically Ulcerative Colitis [2]. Administering steroids in a patient with amoebic colitis is dangerous and contraindicated, as it can lead to toxic megacolon or perforation. **High-Yield Clinical Pearls for NEET-PG:** * **Site:** The most common site for amoebic ulcers is the **Cecum** and ascending colon, but they can involve the sigmoid. * **Microscopy:** Look for trophozoites with **ingested RBCs** (erythrophagocytosis) in the stool or biopsy. * **Treatment Protocol:** Always follow a tissue amoebicide (Metronidazole) with a **luminal amoebicide** (e.g., Paromomycin or Diloxanide furoate) to eradicate the cyst stage and prevent relapse/transmission. * **Complication:** The most common extra-intestinal site is the liver (**Amoebic Liver Abscess**), typically presenting with "anchovy sauce" pus [1].

Question 249: Eradication of Helicobacter pylori has been proved to be beneficial in which of the following disorders of the stomach?

A. Low grade Malt lymphoma (Correct Answer)
B. Erosive gastritis
C. Carcinoma stomach
D. Gastroesophageal disease

Explanation: **Explanation:** The correct answer is **Low-grade MALT lymphoma**. **1. Why Option A is correct:** Helicobacter pylori (H. pylori) infection plays a direct role in the pathogenesis of **Mucosa-Associated Lymphoid Tissue (MALT) lymphoma**. The chronic inflammation induced by the bacteria leads to the recruitment of B-cells and the formation of lymphoid follicles in the gastric mucosa [1]. In early-stage (low-grade) MALT lymphoma, the tumor cells are still dependent on the inflammatory cytokines produced by H. pylori-specific T-cells. Therefore, **eradication of H. pylori** leads to complete regression of the tumor in approximately 70–80% of cases, making it the first-line treatment [1]. **2. Why other options are incorrect:** * **B. Erosive gastritis:** This is typically caused by NSAIDs, alcohol, or acute stress [5]. While H. pylori causes chronic non-erosive gastritis, its eradication does not necessarily resolve acute erosions caused by other agents [5]. * **C. Carcinoma stomach:** While H. pylori is a Class I carcinogen and its eradication *prevents* the development of gastric cancer (especially if treated before the onset of atrophy/metaplasia), it has **no proven benefit** in treating or curing the cancer once it has already developed. * **D. Gastroesophageal Reflux Disease (GERD):** Eradication of H. pylori is controversial in GERD. In some patients, eradication may actually worsen reflux symptoms because the reduction in ammonia/gastritis leads to an increase in gastric acid secretion [3], [4]. **Clinical Pearls for NEET-PG:** * **Definitive Indications for H. pylori Eradication:** Peptic Ulcer Disease (active or healed) [2], Low-grade MALT lymphoma [1], and following resection of early gastric cancer. * **Diagnostic Gold Standard:** Endoscopic biopsy (Urease test/Histology) [2]. * **Non-invasive Gold Standard:** Urea Breath Test (used to confirm eradication) [2]. * **First-line Therapy:** Clarithromycin-based triple therapy (PPI + Amoxicillin + Clarithromycin) for 14 days.

Question 250: Budd-chiari syndrome is most commonly due to:

A. Hepatic vein obstruction (Correct Answer)
B. Acute portal hypertension
C. Congenital portal hypertension
D. IVC obstruction

Explanation: **Explanation:** **Budd-Chiari Syndrome (BCS)** is defined as an obstruction to the hepatic venous outflow at any level from the small hepatic veins to the junction of the inferior vena cava (IVC) with the right atrium. **1. Why Option A is correct:** The hallmark of BCS is the obstruction of the **hepatic veins** [1]. This leads to increased sinusoidal pressure, causing centrizonal congestion, hepatocyte necrosis, and eventually cirrhosis. While the obstruction can occur in the IVC, the classic and most common site of primary pathology in Western literature (and standard medical definitions) is the hepatic veins. **2. Why the other options are incorrect:** * **Option B & C:** Portal hypertension is a **consequence** of Budd-Chiari syndrome, not its cause. BCS causes post-sinusoidal portal hypertension. Congenital portal hypertension (like Extrahepatic Portal Venous Obstruction) involves the portal vein, not the hepatic outflow tract. * **Option D:** While IVC obstruction (membranous webs) is a common cause of BCS in Asia (especially Nepal and China), globally and in standard textbook definitions, hepatic vein thrombosis remains the primary anatomical site associated with the syndrome [1]. **Clinical Pearls for NEET-PG:** * **Classic Triad:** Abdominal pain, ascites, and hepatomegaly. * **Most common cause:** Hypercoagulable states (Polycythemia Vera is the most common myeloproliferative disorder associated). * **Imaging:** Doppler Ultrasound is the initial investigation of choice (shows "spider-web" collaterals). * **Pathology:** "Nutmeg liver" (congestive hepatopathy) is seen on gross examination [2]. * **Caudate Lobe:** Often undergoes **compensatory hypertrophy** because its venous drainage enters the IVC directly, bypassing the major hepatic veins.

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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