Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 851: A 42-year-old company executive presents with a sudden upper gastrointestinal bleed of 5 liters of bright red blood, with no significant previous history. What is the most likely diagnosis?

A. Esophageal varices
B. Duodenal ulcer (Correct Answer)
C. Gastritis
D. Gastric erosion

Explanation: **Explanation:** The correct answer is **Duodenal Ulcer (B)**. In the context of a massive upper gastrointestinal (UGI) bleed, **Duodenal Ulcer (DU)** is the most common cause overall [1]. The clinical presentation of a "sudden" and "massive" (5 liters) bleed is characteristic of an ulcer eroding into a major artery, most commonly the **gastroduodenal artery**, which lies posterior to the first part of the duodenum [1]. While the patient is a "company executive" (a classic stress-related descriptor), the sheer volume of blood points toward a high-pressure arterial source rather than superficial mucosal irritation. **Why other options are incorrect:** * **Esophageal Varices (A):** While variceal bleeding is often massive, it typically occurs in patients with underlying chronic liver disease (stigma of cirrhosis, splenomegaly, or jaundice). The question specifies "no significant previous history," making a peptic ulcer statistically more likely [1]. * **Gastritis (C) and Gastric Erosion (D):** These conditions generally cause "oozing" or "coffee-ground" emesis rather than a sudden, life-threatening 5-liter bright red hemorrhage [2]. They involve superficial mucosal layers and rarely erode into large-caliber vessels [2]. **Clinical Pearls for NEET-PG:** * **Most common cause of UGI bleed:** Duodenal Ulcer [3]. * **Most common vessel involved in massive DU bleed:** Gastroduodenal artery [1]. * **Dieulafoy’s Lesion:** A rare but important differential for massive bleed; it involves a large submucosal artery eroding through the gastric mucosa. * **Rockall Score & Blatchford Score:** High-yield scoring systems used to assess the severity and prognosis of UGI bleeding [3].

Question 852: Which of the following is not an etiological factor for pancreatitis?

A. Abdominal trauma
B. Hyperlipidemia
C. Islet cell hyperplasia (Correct Answer)
D. Germline mutations in the cationic trypsinogen gene

Explanation: **Explanation:** The correct answer is **C. Islet cell hyperplasia**. Pancreatitis is an inflammatory condition of the exocrine pancreas, whereas islet cell hyperplasia involves the endocrine pancreas (specifically the proliferation of insulin-producing beta cells), which is associated with hyperinsulinemic hypoglycemia, not inflammation. **Analysis of Options:** * **Abdominal Trauma (A):** Blunt trauma (e.g., steering wheel injuries) can compress the pancreas against the vertebral column, leading to ductal rupture and the release of digestive enzymes, causing traumatic pancreatitis. * **Hyperlipidemia (B):** Specifically, **Type I, IV, and V hyperlipoproteinemia** (Serum triglycerides >1000 mg/dL) are well-known triggers. The breakdown of excess triglycerides by pancreatic lipase into toxic free fatty acids causes acinar cell injury. * **Germline mutations (D):** Mutations in the **PRSS1 gene** (cationic trypsinogen) lead to **Hereditary Pancreatitis**. These mutations prevent the auto-inactivation of trypsin, leading to premature intrapancreatic enzyme activation and autodigestion [1]. **NEET-PG High-Yield Pearls:** * **Most common causes:** Gallstones (1st) and Alcohol (2nd). * **Drug-induced:** Azathioprine, Sulfonamides, Valproate, and Thiazides are common culprits. * **Genetic markers:** Besides *PRSS1*, mutations in *SPINK1* (trypsin inhibitor) and *CFTR* (Cystic Fibrosis) are high-yield associations [1]. * **Scoring:** Ranson’s criteria and APACHE II are used for prognosis; however, **BISAP score** is a quick bedside tool frequently tested. * **Iatrogenic:** Post-ERCP pancreatitis occurs in approximately 5% of patients [1].

Question 853: Endemic ascites is caused by:

A. Argemone mexicana seed
B. Khesari dal
C. Jhunjhunia seeds (Correct Answer)
D. Ergot poisoning

Explanation: **Explanation:** **Correct Answer: C. Jhunjhunia seeds** **Endemic Ascites** (also known as Veno-Occlusive Disease or VOD) is caused by the consumption of **Jhunjhunia seeds** (*Crotalaria spectabilis* or *Crotalaria retusa*). These seeds contain **Pyrrolizidine alkaloids**, which are potent hepatotoxins. When ingested (often as contaminants in food grains like bajra), they cause non-thrombotic narrowing and occlusion of the small intrahepatic venules. This leads to post-sinusoidal portal hypertension, resulting in rapid-onset ascites, hepatomegaly, and jaundice. This condition has been historically reported in tribal populations of Central India (e.g., Madhya Pradesh and Chhattisgarh). **Analysis of Incorrect Options:** * **A. Argemone mexicana:** Contamination of mustard oil with these seeds causes **Epidemic Dropsy**. The toxin involved is **Sanguinarine**, which leads to widespread capillary leakage, causing bilateral pitting edema, cardiac failure, and glaucoma. * **B. Khesari dal (*Lathyrus sativus*):** Excessive consumption leads to **Neurolathyrism**, a form of spastic paraplegia caused by the neurotoxin **BOAA** (Beta-oxalyl-amino-alanine) [1]. The clinical progression includes a spastic gait characterized by 'walking on tiptoes' with the legs crossing scissor-wise, eventually leading to paraplegia [1]. * **D. Ergot poisoning:** Caused by the fungus *Claviceps purpurea* infecting rye. It leads to **Ergotism**, characterized by gangrene of the extremities (St. Anthony’s Fire) or convulsions. **High-Yield Clinical Pearls for NEET-PG:** * **Endemic Ascites:** Toxin = Pyrrolizidine alkaloids; Pathology = Veno-occlusive disease (VOD). * **Epidemic Dropsy:** Toxin = Sanguinarine; Key test = Nitric acid test (brownish-orange color). * **Lathyrism:** Toxin = BOAA; Prevention = Steeping or Parboiling the pulse [1]. * **Aflatoxin:** Produced by *Aspergillus flavus*; strongly associated with Hepatocellular Carcinoma (HCC).

Question 854: Burning epigastric pain is most commonly due to which of the following conditions?

A. Vomiting
B. Reflux esophagitis (Correct Answer)
C. Duodenal ulcer
D. Gastric ulcer

Explanation: **Explanation:** **Reflux Esophagitis (Option B)** is the most common cause of burning epigastric pain (heartburn). This occurs due to the retrograde flow of acidic gastric contents into the esophagus, irritating the esophageal mucosa [1]. While classic "heartburn" is retrosternal, it frequently presents as burning pain in the epigastrium. In clinical practice and epidemiological studies, Gastroesophageal Reflux Disease (GERD) significantly outweighs Peptic Ulcer Disease (PUD) in prevalence. **Why other options are incorrect:** * **Duodenal Ulcer (Option C):** Typically presents with "hunger pain"—burning or gnawing epigastric pain that occurs 2–5 hours after meals or at night, and is classically **relieved by food** or antacids. * **Gastric Ulcer (Option D):** Pain is often triggered or **aggravated by food** ingestion, leading to weight loss due to food avoidance. While it causes burning pain, it is less common than reflux esophagitis. * **Vomiting (Option A):** This is a clinical symptom/act, not a primary underlying pathology for chronic burning epigastric pain. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** 24-hour ambulatory pH monitoring is the most sensitive test for diagnosing GERD, though endoscopy is the first line to check for complications like **Barrett’s Esophagus** [1]. * **Drug of Choice:** Proton Pump Inhibitors (PPIs) are the mainstay of treatment for both GERD and PUD [1]. * **Alarm Symptoms:** Weight loss, dysphagia, or anemia in a patient with epigastric pain necessitate urgent endoscopy to rule out malignancy [1].

Question 855: Multiple liver secondaries are most common in which patient demographic?

A. Overweight (Correct Answer)
B. Underweight
C. Normal weight
D. Short and shunted

Explanation: The liver is the most common site for hematogenous metastasis from abdominal organs due to its dual blood supply and the portal venous system. The association between being **overweight (Option A)** and liver secondaries is primarily driven by the established link between obesity and increased cancer risk. **Why Overweight is Correct:** 1. **Increased Primary Cancer Incidence:** Obesity is a major risk factor for several primary malignancies that frequently metastasize to the liver, most notably **colorectal cancer**, pancreatic cancer, and breast cancer. 2. **Metabolic Environment:** Adipose tissue functions as an endocrine organ, secreting pro-inflammatory cytokines (IL-6, TNF-α) and adipokines. This chronic low-grade inflammation, combined with hyperinsulinemia and increased insulin-like growth factor (IGF-1), creates a "pro-tumorigenic" environment that facilitates both primary tumor growth and the establishment of metastatic niches in the liver. 3. **NAFLD/NASH:** Overweight individuals often have Non-Alcoholic Fatty Liver Disease, which can progress to cirrhosis, further increasing the risk of both primary (HCC) and secondary hepatic malignancies [1]. **Why Other Options are Incorrect:** * **Underweight (Option B):** While advanced cancer leads to cachexia (weight loss), the demographic *predisposition* for developing the primary cancers that cause these secondaries is linked to higher BMI, not lower. * **Normal weight (Option C):** While cancer can occur in any demographic, statistically, the risk profile for gastrointestinal and metabolic-related cancers is significantly higher in the overweight population. * **Short and shunted (Option D):** This is a distractor. While portosystemic shunts can alter metastatic patterns (potentially bypassing the liver), it is not a standard demographic category for liver secondaries. **High-Yield Pearls for NEET-PG:** * **Most common primary source of liver secondaries:** Colorectal cancer (via portal vein). * **Most common site of distant metastasis for GI cancers:** Liver [1]. * **Imaging Gold Standard:** Contrast-enhanced CT (CECT) typically shows "hypovascular" lesions with peripheral enhancement (target sign). * **Tumor Marker:** Elevated **CEA** is often seen in liver secondaries from a colorectal primary.

Question 856: In Peutz-Jeghers syndrome, where are polyps most commonly seen?

A. Colon
B. Rectum
C. Small bowel (Correct Answer)
D. Stomach

Explanation: Peutz-Jeghers Syndrome (PJS) is an autosomal dominant condition characterized by the association of gastrointestinal hamartomatous polyps and mucocutaneous hyperpigmentation [1]. It is caused by a germline mutation in the STK11 (LKB1) tumor suppressor gene on chromosome 19. **Why Small Bowel is Correct:** In PJS, hamartomatous polyps can occur anywhere in the gastrointestinal tract, but the **small intestine** is the most frequent site of involvement (occurring in >90% of patients) [2]. Within the small bowel, the **jejunum** is the most common specific site, followed by the ileum and duodenum [2]. These polyps are histologically distinct, featuring a characteristic "arborizing" (tree-like) pattern of smooth muscle fibers. **Analysis of Incorrect Options:** * **A & B (Colon and Rectum):** While colonic polyps occur in approximately 30% of PJS patients, they are significantly less common than small bowel involvement. In contrast, the colon is the primary site for *Familial Adenomatous Polyposis (FAP)* [3]. * **D (Stomach):** Gastric polyps occur in about 25% of cases, making it the least common site among the options provided. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad:** Mucocutaneous pigmentation (melanotic macules on lips/buccal mucosa), gastrointestinal hamartomatous polyps, and an increased risk of visceral malignancies [1]. * **Common Complication:** The most common clinical presentation is **intussusception** (often leading to small bowel obstruction), as the large polyps act as lead points [2]. * **Cancer Risk:** Patients have a significantly high lifetime risk of both GI (colorectal, pancreatic) and extra-GI cancers (breast, ovary, cervix, and Sertoli cell tumors of the testes) [1]. * **Management:** Regular screening via upper GI endoscopy, colonoscopy, and capsule endoscopy/MR enterography is essential.

Question 857: All of the following are part of the management of acute variceal hemorrhage except?

A. Sengstaken-Blakemore tube
B. Octreotide
C. Band ligation
D. Beta blockers (Correct Answer)

Explanation: **Explanation:** The management of acute variceal hemorrhage focuses on hemodynamic stabilization, pharmacological control of portal pressure, and endoscopic intervention [1], [3]. **Why Beta Blockers are the Correct Answer (The "Except"):** Non-selective beta-blockers (NSBBs) like **Propranolol or Nadolol** are contraindicated in the acute phase of bleeding. They cause splanchnic vasoconstriction and can lower blood pressure, which may worsen the hemodynamic instability of a patient already in shock. Their role is strictly limited to **Primary Prophylaxis** (preventing the first bleed) and **Secondary Prophylaxis** (preventing recurrence after the acute episode has resolved). **Analysis of Incorrect Options:** * **Octreotide:** This is the pharmacological drug of choice in acute settings. It is a somatostatin analogue that causes selective splanchnic vasoconstriction, thereby reducing portal venous pressure without the systemic side effects of vasopressin. Terlipressin is another synthetic analogue used to reduce portal blood flow and mortality [1]. * **Band Ligation (EVL):** Endoscopic Variceal Ligation is the definitive gold-standard procedure for controlling acute bleeding [1]. It should be performed as soon as the patient is stabilized (ideally within 12 hours). * **Sengstaken-Blakemore (SB) Tube:** This is used as a **bridge therapy** for refractory bleeding [2]. It provides mechanical tamponade to stop the hemorrhage temporarily until definitive treatment (like TIPS) can be performed [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Antibiotic Prophylaxis:** Ceftriaxone (or Norfloxacin) is mandatory in all patients with variceal bleed to prevent SBP and improve survival. * **Target Hemoglobin:** A restrictive transfusion strategy (Target Hb: **7–8 g/dL**) is preferred, as over-transfusion increases portal pressure and risk of re-bleeding. * **TIPS:** Indicated if endoscopic and pharmacological treatments fail (Rescue therapy) [2].

Question 858: All of the following statements about Miliary Tuberculosis are true EXCEPT?

A. May occur following primary infection
B. May occur following secondary reactivation
C. Sputum microscopy is usually negative
D. Mantoux test is always positive (Correct Answer)

Explanation: ### Explanation **Miliary Tuberculosis (TB)** is a life-threatening form of disseminated TB resulting from the hematogenous spread of *Mycobacterium tuberculosis* [1]. **Why Option D is the Correct Answer (The False Statement):** The Mantoux test (Tuberculin Skin Test) is **not** always positive in miliary TB. In fact, it is negative in approximately **30-50%** of cases. This occurs due to **anergy**, where the body’s cell-mediated immune response is overwhelmed by the high bacterial load or suppressed by severe systemic illness, malnutrition, or concurrent infections (like HIV). Therefore, a negative Mantoux test never rules out miliary TB. **Analysis of Other Options:** * **Option A & B:** Miliary TB can occur during **primary infection** (common in children and immunocompromised adults) or via **secondary reactivation** of a latent focus [1]. Both represent a failure of the immune system to contain the bacilli. * **Option C:** Sputum microscopy is **usually negative** because miliary TB involves interstitial seeding rather than cavitary endobronchial disease [1]. Diagnosis often requires more invasive methods like gastric lavage, bone marrow biopsy, or liver biopsy. **Clinical Pearls for NEET-PG:** * **Chest X-ray:** Characterized by "millet-sized" (1–2 mm) nodules distributed uniformly across both lung fields [1]. * **Fundoscopy:** Presence of **Choroidal Tubercles** is pathognomonic for miliary TB [1]. * **Hematology:** Can present with leukopenia, leukocytosis, or even a **leukemoid reaction**. * **Hyponatremia:** Often seen due to SIADH or adrenal involvement (Addison’s disease). * **Gold Standard Diagnosis:** Culture of *M. tuberculosis* from clinical specimens (though biopsy showing granulomas is often used for rapid presumptive diagnosis).

Question 859: Conjugated hyperbilirubinemia is characteristic of which of the following conditions?

A. Dubin-Johnson syndrome (Correct Answer)
B. Crigler-Najjar syndrome
C. Breast milk jaundice
D. Gilbert syndrome

Explanation: Hyperbilirubinemia is classified into unconjugated (pre-microsomal) and conjugated (post-microsomal) based on the step of bilirubin metabolism affected [2]. **1. Why Dubin-Johnson Syndrome is Correct:** Dubin-Johnson syndrome is an autosomal recessive disorder caused by a mutation in the **MRP2 gene**, which encodes the protein responsible for transporting conjugated bilirubin from hepatocytes into the bile canaliculi. Since the defect occurs **after** conjugation in the liver, conjugated bilirubin leaks back into the blood, leading to **conjugated hyperbilirubinemia** [2]. A hallmark feature is a **grossly black liver** due to the accumulation of epinephrine metabolites in lysosomes. **2. Why the Other Options are Incorrect:** * **Crigler-Najjar Syndrome (Type I & II):** Caused by a total or partial deficiency of the enzyme **UDP-glucuronosyltransferase (UGT1A1)** [1]. This prevents the conjugation of bilirubin, leading to severe **unconjugated hyperbilirubinemia** [2]. * **Gilbert Syndrome:** The most common hereditary hyperbilirubinemia, caused by reduced activity of **UGT1A1** [1]. It results in mild, fluctuating **unconjugated hyperbilirubinemia**, often triggered by stress, fasting, or illness. * **Breast Milk Jaundice:** Occurs in neonates due to substances in breast milk (like beta-glucuronidase) that increase the enterohepatic circulation of bilirubin, leading to **unconjugated hyperbilirubinemia**. **High-Yield Clinical Pearls for NEET-PG:** * **Rotor Syndrome:** Similar to Dubin-Johnson (conjugated hyperbilirubinemia) but lacks the black liver pigmentation and has a different urinary coproporphyrin excretion pattern. * **Dubin-Johnson Mnemonic:** **D**ubin-**J**ohnson has a **D**ark liver. * **Urinary Coproporphyrin:** In Dubin-Johnson, total coproporphyrin levels are normal, but **>80% is Coproporphyrin I** (normally, Coproporphyrin III predominates).

Question 860: Which of the following statements about Wilson's disease is false?

A. It is an autosomal recessive disorder.
B. Kayser-Fleischer rings are typically seen.
C. Copper levels are elevated.
D. Ceruloplasmin levels are elevated. (Correct Answer)

Explanation: Wilson’s disease (Hepatolenticular degeneration) is a disorder of copper metabolism caused by a mutation in the **ATP7B gene** on chromosome 13 [1]. This defect impairs the biliary excretion of copper and its incorporation into ceruloplasmin. **Why Option D is the Correct (False) Statement:** In Wilson’s disease, **ceruloplasmin levels are characteristically low** (<20 mg/dL), not elevated [2]. The defect in the ATP7B protein prevents the binding of copper to apoceruloplasmin. Unbound apoceruloplasmin is unstable and rapidly degraded in the circulation, leading to reduced serum levels. **Analysis of Other Options:** * **Option A (True):** It is an **autosomal recessive** condition. A family history is often present, and screening of siblings is mandatory. * **Option B (True):** **Kayser-Fleischer (KF) rings** are caused by copper deposition in the Descemet’s membrane of the cornea. They are present in 95% of patients with neurological symptoms and are best seen via slit-lamp examination [1]. * **Option C (True):** While serum *total* copper may be low (due to low ceruloplasmin), the **free (non-ceruloplasmin bound) copper** and **tissue copper levels** (liver, brain) are significantly elevated, leading to organ toxicity [1]. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Increased hepatic copper content on liver biopsy (>250 μg/g dry weight). * **Neurological Hallmark:** Wing-beating tremor and "Face of the Giant Panda" sign on MRI Brain [1]. * **Hematology:** Coombs-negative hemolytic anemia is a classic presentation [1]. * **Treatment:** Drug of choice is **Penicillamine** (chelator) or **Trientine**. Oral **Zinc** is used for maintenance as it interferes with intestinal copper absorption.

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

Practice Questions

Malabsorption Syndromes

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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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