Gastroenterology — MCQs

A 30-year-old man presents with increasing difficulty in swallowing both solids and liquids. Physical examination is noncontributory. Barium swallow studies reveal a dilated esophagus with slow passage of barium into the stomach and a narrowed distal esophagus with a "bird's beak" appearance. Esophageal manometry shows incomplete relaxation of the lower esophageal sphincter in response to swallowing, high resting lower esophageal pressure, and absent esophageal peristalsis. What is the most likely underlying cause of this patient's condition?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 231: A patient is being evaluated for jaundice and liver fibrosis. His AST=87 IU/mL and ALT=81 IU/mL. His serological tests are: IgM Anti-HbcAg Non-reactive, IgG Anti-HbcAg Reactive, HbsAg Non-reactive, HBeAg Non-reactive, and Anti-HCV Reactive. Which of the following is the next step in the diagnosis?

A. HBV DNA
B. Anti-HBsAg
C. HCV-RNA-PCR (Correct Answer)
D. Liver biopsy

Explanation: ### Explanation The patient presents with elevated transaminases (AST > ALT), jaundice, and fibrosis, indicating chronic liver disease. To determine the etiology, we must interpret the serological markers provided: 1. **Hepatitis C Status:** The patient is **Anti-HCV Reactive**. This indicates either a current (active) infection or a resolved past infection [1]. To differentiate between the two and confirm active viremia, the gold standard next step is a quantitative **HCV-RNA-PCR** [1]. 2. **Hepatitis B Status:** * **HBsAg Non-reactive** and **IgM Anti-HBc Non-reactive** rule out acute or chronic active HBV infection [2]. * **IgG Anti-HBc Reactive** indicates a **past exposure** to HBV (natural infection) [2]. Since HBsAg is negative, the virus has been cleared (or is in an occult state), making HBV an unlikely cause of the current jaundice. #### Why other options are incorrect: * **HBV DNA:** Not indicated as HBsAg is negative; there is no evidence of active HBV replication [2]. * **Anti-HBsAg:** While this would confirm immunity (recovery) from HBV, it does not help diagnose the cause of the current liver injury. * **Liver Biopsy:** Though it can assess the degree of fibrosis, it is not the "next step" in diagnostic workup. Non-invasive viral confirmation must precede invasive procedures. #### NEET-PG High-Yield Pearls: * **HCV Screening:** Anti-HCV is the screening test; HCV-RNA is the confirmatory test [1]. * **Window Period:** In acute HBV, if both HBsAg and Anti-HBs are negative, **IgM Anti-HBc** is the only positive marker (the "Window Period") [2]. * **Isolated IgG Anti-HBc:** Can signify a resolved infection (if Anti-HBs is positive), a false positive, or occult HBV. * **AST/ALT Ratio:** In most chronic viral hepatitis, ALT > AST [3]. However, if **AST > ALT**, suspect progression to **cirrhosis** or an alcoholic etiology.

Question 232: Which of the following is the most appropriate treatment for hepatic encephalopathy?

A. Diuretics
B. High protein diet
C. Emergency portosystemic shunt surgery
D. Lactulose (Correct Answer)

Explanation: **Explanation:** **Hepatic Encephalopathy (HE)** is a reversible neuropsychiatric syndrome caused by liver failure or portosystemic shunting, leading to the accumulation of neurotoxins, primarily **ammonia (NH₃)** [1]. **Why Lactulose is the Correct Answer:** Lactulose, a non-absorbable disaccharide, is the **first-line treatment** for HE. It works through two primary mechanisms: 1. **Acidification:** Colonic bacteria metabolize lactulose into lactic and acetic acids. This lowers the pH, converting ammonia (NH₃) into non-absorbable ammonium ions (NH₄⁺), which are then trapped in the gut (**"Ammonia Trapping"**). 2. **Catharsis:** It acts as an osmotic laxative, increasing colonic transit and physically expelling nitrogenous waste. **Analysis of Incorrect Options:** * **A. Diuretics:** These are contraindicated in acute HE. Diuretics can cause dehydration, hypokalemia, and metabolic alkalosis, all of which worsen encephalopathy by increasing renal ammonia production and promoting its entry into the blood-brain barrier. * **B. High Protein Diet:** Traditionally, protein was restricted; however, current guidelines recommend **normal protein intake (1.2–1.5 g/kg/day)** to prevent muscle wasting. A "high" protein diet can increase ammonia production and precipitate HE. * **C. Emergency Portosystemic Shunt (TIPS):** While TIPS can treat refractory variceal bleeding, it often **precipitates or worsens HE** because it allows portal blood to bypass the liver's detoxification process [1]. **NEET-PG High-Yield Pearls:** * **Drug of Choice (DOC):** Lactulose. * **Second-line/Add-on:** **Rifaximin** (a non-absorbable antibiotic) is added if lactulose alone is insufficient. * **Most common precipitant:** Infection (SBP), GI bleed, or constipation. * **Target:** Aim for 2–3 soft stools per day. * **Flumazenil:** May be used if benzodiazepine ingestion is a suspected trigger.

Question 233: Which of the following is NOT true regarding Crohn's disease?

A. Scleroderma (Correct Answer)
B. Transmural involvement
C. Cobblestone appearance
D. Skin involvement

Explanation: **Explanation:** Crohn’s disease is a chronic inflammatory bowel disease (IBD) characterized by transmural, granulomatous inflammation that can affect any part of the gastrointestinal tract from the mouth to the anus. **Why Scleroderma is the correct answer:** Scleroderma (Systemic Sclerosis) is a connective tissue disorder characterized by skin thickening and fibrosis of internal organs [4]. While it can involve the GI tract (most commonly causing esophageal dysmotility and "watermelon stomach"), it is **not** a feature or complication of Crohn’s disease [4]. Crohn's is associated with other extra-intestinal manifestations like uveitis, ankylosing spondylitis, and Primary Sclerosing Cholangitis (though PSC is more common in Ulcerative Colitis). **Analysis of incorrect options:** * **Transmural involvement:** This is a hallmark of Crohn’s disease. Unlike Ulcerative Colitis (which is limited to the mucosa/submucosa), Crohn’s affects all layers of the bowel wall, leading to complications like fistulas, abscesses, and strictures [1]. [3] * **Cobblestone appearance:** This is a classic endoscopic finding. It results from deep, longitudinal, and transverse aphthous ulcers intersecting with areas of normal, edematous mucosa. * **Skin involvement:** Crohn’s disease has significant cutaneous manifestations. The most common are **Erythema Nodosum** (correlates with disease activity) and **Pyoderma Gangrenosum**. "Metastatic Crohn’s" can also occur, where skin lesions show non-caseating granulomas. **NEET-PG High-Yield Pearls:** * **Skip Lesions:** Discontinuous involvement of the bowel (characteristic of Crohn's) [2]. * **String Sign of Kantor:** Radiologic finding due to terminal ileal strictures [5]. * **Histology:** Non-caseating granulomas are pathognomonic (seen in ~40-60%). * **Serology:** ASCA (Anti-Saccharomyces cerevisiae antibodies) is positive in Crohn’s, whereas p-ANCA is more specific for Ulcerative Colitis.

Question 234: A 22-year-old man with inflammatory bowel disease is noted to have a "string sign" in the ileal area on barium enema. In which of the following conditions is this sign most often seen?

A. In the stenotic or nonstenotic phase of the disease (Correct Answer)
B. In the stenotic phase only
C. As a rigid, nondistensible phenomenon
D. With gastric involvement

Explanation: The **"String Sign of Kantor"** is a classic radiological finding in **Crohn’s Disease**, typically seen in the terminal ileum [1]. It represents a significant narrowing of the bowel lumen, making it appear as a thin, frayed thread of barium. [1] ### **Explanation of the Correct Answer** **Option A** is correct because the string sign is not exclusively caused by permanent fibrosis. It can occur in: 1. **The Non-stenotic Phase:** Caused by **severe irritability and intense spasm** associated with acute inflammation and ulceration. 2. **The Stenotic Phase:** Caused by **fibrosis and cicatrization**, leading to a permanent, fixed narrowing of the lumen [1]. Because the sign can be transient (due to spasm) or persistent (due to stricture), it is seen in both phases. ### **Analysis of Incorrect Options** * **Option B:** Incorrect because it overlooks the inflammatory/spastic component. If the sign disappears with the administration of antispasmodics, it indicates the non-stenotic phase. * **Option C:** This describes a "Lead Pipe" appearance (seen in Ulcerative Colitis) or a fixed stricture [2]. While the string sign *can* be rigid, it is not defined solely by nondistensibility, as spasm-induced narrowing is reversible. * **Option D:** While Crohn’s can involve the stomach (Ram’s horn sign), the "String Sign" specifically refers to the ileal narrowing in this context [1]. ### **NEET-PG High-Yield Pearls** * **String Sign of Kantor:** Crohn’s Disease (Terminal Ileum) [1]. * **String Sign of Labbe:** Hypertrophic Pyloric Stenosis (Pyloric canal narrowing). * **Stierlin Sign:** Narrowing of the terminal ileum with a rapid emptying of the cecum (seen in Ileocecal Tuberculosis). * **Lead Pipe Appearance:** Loss of haustrations in Ulcerative Colitis [2]. * **Proud Flesh:** Polypoid mucosal tags seen in Crohn's disease.

Question 235: An elderly male presents to the Emergency Department following a bout of prolonged vomiting with significant hematemesis, subsequent to alcohol ingestion. What is the most likely diagnosis?

A. Mallory-Weiss syndrome (Correct Answer)
B. Esophageal varices
C. Gastric cancer
D. Bleeding disorder

Explanation: **Explanation:** **1. Why Mallory-Weiss Syndrome (MWS) is correct:** The classic clinical presentation of MWS is **hematemesis following a bout of forceful vomiting or retching**, often triggered by alcohol binge drinking [1]. The underlying mechanism is a **longitudinal mucosal laceration** at the gastroesophageal junction or distal esophagus. This occurs due to a sudden increase in intra-abdominal pressure against a closed glottis. In elderly patients or those with alcohol use disorder, the esophageal mucosa is more susceptible to these pressure changes [1]. **2. Why the other options are incorrect:** * **Esophageal Varices:** While common in chronic alcoholics with cirrhosis, variceal bleeding is typically massive, painless, and occurs *spontaneously* without the preceding "vomiting-then-blood" sequence characteristic of MWS [1]. * **Gastric Cancer:** This usually presents with chronic symptoms like weight loss, early satiety, and iron-deficiency anemia (occult blood). Acute, massive hematemesis following vomiting is not the typical primary presentation. * **Bleeding Disorder:** While systemic coagulopathies can exacerbate GI bleeding, they do not explain the specific mechanical trigger (prolonged vomiting) described in this scenario. **3. NEET-PG High-Yield Pearls:** * **Location:** Most tears (75%) occur in the **gastric cardia** just below the Z-line. * **Diagnosis:** The gold standard is **Upper GI Endoscopy (OGD)**, which reveals linear mucosal tears [1]. * **Management:** Most cases (80-90%) stop bleeding **spontaneously** with supportive care (IV fluids, PPIs). Active bleeding is managed endoscopically with epinephrine injection, clipping, or thermal coagulation. * **Boerhaave Syndrome vs. MWS:** Remember that MWS is a partial-thickness mucosal tear (hematemesis), whereas Boerhaave Syndrome is a **full-thickness esophageal perforation** (chest pain, subcutaneous emphysema, and shock).

Question 236: Features of alcoholic hepatitis include all of the following except?

A. Elevated bilirubin
B. Prolonged prothrombin time
C. Elevated serum albumin (Correct Answer)
D. Anemia

Explanation: **Explanation:** Alcoholic hepatitis is a clinical syndrome characterized by inflammation and necrosis of the liver parenchyma due to chronic, heavy alcohol consumption [1]. **Why "Elevated serum albumin" is the correct answer:** Albumin is synthesized exclusively by the liver. In alcoholic hepatitis, there is significant hepatocellular dysfunction and impaired protein synthesis. Furthermore, chronic alcoholics often suffer from malnutrition. Therefore, **hypoalbuminemia** (low serum albumin) is a hallmark of the disease, not elevated levels. Elevated albumin is never a feature of chronic liver injury. **Analysis of other options:** * **Elevated bilirubin:** Jaundice is a cardinal feature of alcoholic hepatitis. Impaired conjugation and excretion by damaged hepatocytes lead to significant hyperbilirubinemia. * **Prolonged prothrombin time (PT):** The liver synthesizes clotting factors (II, VII, IX, X). In acute-on-chronic liver injury, synthesis is impaired, leading to a prolonged PT/increased INR [2]. This is a key marker of severity (used in the Maddrey Discriminant Function). * **Anemia:** This is very common in alcoholic hepatitis due to multiple factors: direct bone marrow toxicity of alcohol, nutritional deficiencies (folate/B12), chronic gastrointestinal blood loss, or hypersplenism [3]. **High-Yield Clinical Pearls for NEET-PG:** 1. **AST:ALT Ratio:** Classically **>2:1**. AST is rarely >500 IU/L; if it is, consider other etiologies like viral or drug-induced hepatitis. 2. **Maddrey Discriminant Function (DF):** Calculated as `4.6 x [PT - control PT] + Serum Bilirubin`. A score **>32** indicates severe disease and is an indication for **Corticosteroids** (Prednisolone) [3]. 3. **Histology:** Look for **Mallory-Denk bodies** (eosinophilic intracytoplasmic inclusions) and "chicken-wire" fibrosis. 4. **Leukemoid Reaction:** Severe alcoholic hepatitis can present with a very high WBC count (neutrophilia), mimicking sepsis.

Question 237: Which of the following is NOT a cause of chronic gastritis?

A. Helicobacter pylori
B. Pernicious anemia
C. Alcohol
D. Overuse of salicylates (Correct Answer)

Explanation: **Explanation:** The distinction between **acute** and **chronic** gastritis is based on the nature of the inflammatory infiltrate and the duration of the insult [1]. **Why "Overuse of Salicylates" is the correct answer:** Salicylates (Aspirin) and other NSAIDs are classic causes of **Acute Gastritis** (specifically Acute Erosive Gastritis) [1]. They act by inhibiting COX-1 enzymes, leading to decreased prostaglandin synthesis. Prostaglandins are essential for maintaining the gastric mucosal barrier; their depletion leads to acute superficial erosions and mucosal hemorrhages rather than the long-term lymphocytic/plasma cell infiltration characteristic of chronic gastritis [1][3]. **Analysis of Incorrect Options:** * **Helicobacter pylori (A):** This is the **most common cause** of chronic gastritis worldwide [1]. It typically causes a B-type (Antral) gastritis characterized by chronic inflammatory cells and can lead to peptic ulcers and gastric adenocarcinoma [2]. * **Pernicious Anemia (B):** This is associated with **Type A (Autoimmune) Chronic Gastritis** [1]. Antibodies target parietal cells and intrinsic factor in the fundus and body, leading to glandular atrophy and vitamin B12 deficiency. * **Alcohol (C):** While often associated with acute binges, chronic alcohol consumption is a recognized cause of chronic non-specific gastritis due to persistent mucosal irritation and impaired epithelial regeneration [1]. **NEET-PG High-Yield Pearls:** * **Type A Gastritis:** **A**utoimmune, involves the **A**ndus (Fundus)/Body, associated with **A**nemia (Pernicious) [1]. * **Type B Gastritis:** **B**acterial (*H. pylori*), involves the **B**antrum (Antrum) [2]. * **Histology:** Chronic gastritis is defined by the presence of **lymphocytes and plasma cells**, whereas acute gastritis is defined by **neutrophils** [1]. * **NSAIDs/Salicylates:** Always think "Acute Erosive Gastritis" or "Peptic Ulcer Disease" rather than chronic inflammatory gastritis [3].

Question 238: Antibiotics are useful in all of the following conditions except?

A. Whipple disease
B. Blind loop syndrome
C. Celiac disease (Correct Answer)
D. Colon polyps

Explanation: **Explanation:** The correct answer is **Celiac disease**. Celiac disease is an immune-mediated enteropathy triggered by the ingestion of **gluten** in genetically susceptible individuals (HLA-DQ2/DQ8) [1]. The management is strictly dietary—a lifelong **gluten-free diet (GFD)**. Antibiotics have no role in its primary treatment. **Analysis of Options:** * **Whipple Disease:** Caused by the bacterium *Tropheryma whipplei* [1]. Long-term antibiotic therapy (typically Ceftriaxone followed by Trimethoprim-sulfamethoxazole for 1 year) is essential for cure. * **Blind Loop Syndrome (SIBO):** Stasis in a segment of the small bowel leads to Small Intestinal Bacterial Overgrowth (SIBO) [1]. Treatment involves correcting the anatomical defect and using broad-spectrum antibiotics (e.g., Rifaximin) to reduce bacterial load. * **Colon Polyps:** While primarily managed via endoscopic resection (polypectomy), recent research and clinical trials have explored the role of the gut microbiome in colorectal carcinogenesis. However, in the context of standard medical management, if a choice must be made between an autoimmune condition (Celiac) and others, Celiac is the definitive "non-antibiotic" condition. *Note: Some older versions of this question list Tropical Sprue instead of polyps; Tropical Sprue requires Tetracycline and Folic acid.* **High-Yield Clinical Pearls for NEET-PG:** * **Celiac Disease Gold Standard:** Small intestinal biopsy showing villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes [1]. * **Serology:** Anti-tissue Transglutaminase (anti-tTG) IgA is the screening test of choice [1]. * **Whipple Disease Hallmark:** PAS-positive macrophages in the lamina propria [1]. * **Blind Loop Syndrome:** Often presents with Vitamin B12 deficiency (bacteria compete for B12) and steatorrhea (deconjugation of bile salts) [1].

Question 239: Which of the following is associated with carcinoma of the pancreas?

A. Hypoglycemia (Correct Answer)
B. Syndrome of inappropriate secretion of ADH
C. Erythropoiesis is due to erythropoietin
D. Hypercalcemia

Explanation: Carcinoma of the pancreas, specifically **Insulinomas** (the most common functional pancreatic neuroendocrine tumor), is classically associated with **Hypoglycemia** [1]. These tumors arise from the beta cells of the islets of Langerhans and autonomously secrete insulin, leading to the clinical presentation known as **Whipple’s Triad**: symptoms of hypoglycemia, low plasma glucose levels (<50 mg/dL), and relief of symptoms upon glucose administration [1]. **Analysis of Options:** * **A. Hypoglycemia (Correct):** As mentioned, this is the hallmark of insulin-secreting pancreatic tumors [1]. Additionally, advanced pancreatic adenocarcinoma can occasionally cause hypoglycemia through massive hepatic replacement or IGF-II secretion (though rare). * **B. SIADH:** This paraneoplastic syndrome is most strongly associated with **Small Cell Carcinoma of the Lung**, not pancreatic cancer. * **C. Erythropoiesis (Erythrocytosis):** Ectopic erythropoietin production is typically seen in **Renal Cell Carcinoma (RCC)**, Hepatocellular Carcinoma (HCC), Hemangioblastoma, and Uterine Fibroids. * **D. Hypercalcemia:** While hypercalcemia can occur in malignancy (via PTHrP), it is most frequently associated with **Squamous Cell Carcinoma of the Lung**, Breast Cancer, and Multiple Myeloma. **NEET-PG High-Yield Pearls:** * **Courvoisier’s Law:** In a patient with painless obstructive jaundice and a palpable gallbladder, the cause is unlikely to be gallstones and is more likely to be malignancy (e.g., Head of Pancreas CA). * **Trousseau Sign of Malignancy:** Migratory thrombophlebitis associated with visceral cancers, especially pancreatic adenocarcinoma. * **Tumor Marker:** **CA 19-9** is the most specific marker for monitoring pancreatic cancer. * **Zollinger-Ellison Syndrome:** Caused by a Gastrinoma (often in the pancreas), leading to refractory peptic ulcers.

Question 240: A 30-year-old man presents with increasing difficulty in swallowing both solids and liquids. Physical examination is noncontributory. Barium swallow studies reveal a dilated esophagus with slow passage of barium into the stomach and a narrowed distal esophagus with a "bird's beak" appearance. Esophageal manometry shows incomplete relaxation of the lower esophageal sphincter in response to swallowing, high resting lower esophageal pressure, and absent esophageal peristalsis. What is the most likely underlying cause of this patient's condition?

A. Acid reflux
B. Cancerous destruction
C. Candida infection
D. Lack of ganglion cells (Correct Answer)

Explanation: ### Explanation The clinical presentation and diagnostic findings are classic for **Achalasia Cardia**. **1. Why "Lack of ganglion cells" is correct:** Achalasia is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis in the distal esophagus [1]. The underlying pathophysiology involves the **degeneration of inhibitory nitrergic neurons** in the **myenteric (Auerbach’s) plexus**. This loss of ganglion cells leads to an imbalance between excitatory and inhibitory neurotransmission, resulting in a hypertensive LES that fails to relax upon swallowing [1]. **2. Why other options are incorrect:** * **A. Acid reflux:** Typically causes Gastroesophageal Reflux Disease (GERD). While chronic GERD can lead to peptic strictures (causing dysphagia), it usually presents with heartburn and shows a patent/low-pressure LES on manometry, not a hypertensive one. * **B. Cancerous destruction:** Esophageal cancer usually presents in older patients with progressive dysphagia (initially for solids, then liquids) and significant weight loss. While "Pseudoachalasia" can occur due to tumor infiltration at the GE junction, the primary pathology in a young patient with classic manometry is idiopathic achalasia. * **C. Candida infection:** This causes infectious esophagitis, typically presenting with **odynophagia** (painful swallowing) in immunocompromised individuals. Endoscopy would show white friable plaques, not the "bird's beak" appearance. **3. NEET-PG High-Yield Pearls:** * **Clinical Triad:** Dysphagia (solids + liquids), Regurgitation, and Weight loss. * **Barium Swallow:** "Bird’s beak" or "Rat-tail" appearance due to persistent narrowing at the GE junction [1]. * **Manometry (Gold Standard):** Shows incomplete LES relaxation (Residual pressure >10 mmHg) and aperistalsis [1]. * **Treatment:** Heller’s Myotomy (surgical) or POEM (Peroral Endoscopic Myotomy) are definitive; Pneumatic dilation is the most effective non-surgical option.

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Esophageal Disorders

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Peptic Ulcer Disease

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Inflammatory Bowel Disease

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Irritable Bowel Syndrome

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Malabsorption Syndromes

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Pancreatitis (Acute and Chronic)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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