Gastroenterology — MCQs

A 85-year-old man presents with severe crampy abdominal pain which is worse after eating, associated with frequent nausea, bloating and watery diarrhoea. His other medical problems include coronary artery disease, hypertension, hypercholesterolemia. He has a 40-pack-year smoking history. Barium enema is as shown. What is the most probable cause?

Q399Medium

Which of the following is an important risk factor for the development of squamous cell carcinoma?

Q400Medium

A 60-year-old man with a known history of hemochromatosis, cirrhosis, and portal hypertension presented to the emergency department with altered mental status. The patient's attendant reported that over the last three days, the patient has become confused. There is no history of melena or hematemesis. For chronic ascites, diet control and spironolactone are being administered regularly. In the past, the patient experienced an episode of variceal bleeding for which he was prescribed propranolol, and no further episodes have occurred. On examination, the patient is not well-oriented to time and place but is oriented to person. He is afebrile, and his vital signs are stable; however, ascites and asterixis are notable. Laboratory investigations show a hemoglobin of 10.1 g/dL, creatinine of 1.4 mg/dL, and blood urea nitrogen of 45 mg/dL. Paracentesis revealed clear fluid with 800 WBC (40% neutrophils). Which statement regarding this condition is false?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 391: What is the first line of treatment for severe ascites?

A. Bed rest and salt restriction
B. Therapeutic paracentesis (Correct Answer)
C. Shunt placement
D. Diuretics

Explanation: The management of ascites is graded based on severity. **Therapeutic Paracentesis (Large Volume Paracentesis - LVP)** is the first-line treatment for **Grade 3 (Severe/Tense) ascites**. This is because LVP provides rapid symptomatic relief from abdominal pressure and respiratory distress more effectively and faster than diuretics. When performing LVP, if more than 5 liters are removed, albumin replacement (6–8 g per liter of fluid removed) is mandatory to prevent post-paracentesis circulatory dysfunction. [1] **Analysis of Incorrect Options:** * **A. Bed rest and salt restriction:** While salt restriction (<2g/day) is the cornerstone for Grade 1 and 2 ascites, it is insufficient as a primary treatment for severe, tense ascites. Bed rest is no longer routinely recommended as it does not significantly improve diuresis and may cause pressure sores. * **C. Shunt placement (TIPS):** Transjugular Intrahepatic Portosystemic Shunt is a second-line intervention reserved for **refractory ascites** [2] (ascites that cannot be managed by medical therapy or recurs rapidly after LVP). * **D. Diuretics:** Diuretics (Spironolactone and Furosemide) are the mainstay for **Grade 2 (Moderate) ascites**. In severe ascites, they are used for maintenance therapy *after* the initial volume has been reduced by paracentesis. **High-Yield Clinical Pearls for NEET-PG:** * **SAAG Score:** The most important initial test. SAAG ≥1.1 g/dL indicates portal hypertension (e.g., Cirrhosis, CHF). [1] * **Spontaneous Bacterial Peritonitis (SBP):** Diagnosed when PMN count in ascitic fluid is **>250 cells/mm³**. * **Diuretic Ratio:** The classic starting ratio is **100mg Spironolactone : 40mg Furosemide** to maintain potassium balance. * **Refractory Ascites:** Defined by lack of response to high-dose diuretics (400mg Spironolactone + 160mg Furosemide) or rapid recurrence after LVP.

Question 392: Diarrhea with acanthocytosis is seen in which of the following conditions?

A. Whipple's disease
B. Celiac sprue
C. Wolman's Disease (Correct Answer)
D. Ulcerative colitis

Explanation: **Explanation:** The association of **diarrhea and acanthocytosis** (thorny red blood cells) is a classic clinical marker for disorders involving defective assembly or secretion of chylomicrons, leading to severe fat malabsorption. **Why Wolman’s Disease is correct:** Wolman’s Disease is a rare autosomal recessive lysosomal storage disorder caused by a deficiency of **Lysosomal Acid Lipase (LAL)**. This leads to the accumulation of cholesteryl esters and triglycerides in various organs. In the intestine, this results in severe malabsorption and steatorrhea (diarrhea). The altered lipid metabolism affects the erythrocyte membrane lipid composition, leading to the formation of **acanthocytes**. A pathognomonic finding in Wolman’s is **bilateral adrenal calcification**. **Analysis of Incorrect Options:** * **Whipple’s Disease:** Caused by *Tropheryma whipplei* [1]. While it presents with diarrhea, malabsorption, and arthralgia, it is characterized by PAS-positive macrophages in the lamina propria, not acanthocytosis [1]. * **Celiac Sprue:** An immune-mediated enteropathy due to gluten sensitivity [2]. It causes malabsorption and villous atrophy but is not typically associated with acanthocytosis [2]. * **Ulcerative Colitis:** An inflammatory bowel disease (IBD) presenting with bloody diarrhea and mucoid stools. It involves colonic mucosal inflammation rather than small bowel fat malabsorption [2]. **NEET-PG High-Yield Pearls:** 1. **Abetalipoproteinemia:** This is the *most common* condition associated with the triad of fat malabsorption (diarrhea), acanthocytosis, and neurological symptoms (ataxia/retinitis pigmentosa) due to MTP gene mutations. 2. **Wolman’s vs. CESD:** Wolman’s is the acute, infantile form of LAL deficiency (fatal early); Cholesteryl Ester Storage Disease (CESD) is the milder, adult-onset form. 3. **Acanthocytes** are also seen in: Liver disease (Spur cell anemia), McLeod syndrome, and Post-splenectomy states.

Question 393: A patient presents with a history of mild diarrhea, blood in stools, and multiple fistulas. What is the most probable diagnosis?

A. Intestinal tuberculosis
B. Ulcerative colitis
C. Crohn's disease (Correct Answer)
D. Typhoid

Explanation: ### Explanation The clinical presentation of chronic diarrhea, hematochezia, and **multiple fistulas** is a classic hallmark of **Crohn’s Disease** [1]. **1. Why Crohn’s Disease is Correct:** Crohn’s disease is a chronic inflammatory bowel disease (IBD) characterized by **transmural inflammation** (involving all layers of the bowel wall). This deep inflammation leads to the formation of sinus tracts that penetrate through the serosa into adjacent organs or the skin, resulting in **fistulas** (perianal, entero-enteric, or entero-vesical) [1]. While blood in stools is more common in Ulcerative Colitis, it frequently occurs in Crohn’s when the colon is involved [1]. **2. Why Other Options are Incorrect:** * **Ulcerative Colitis:** Inflammation is limited to the **mucosa and submucosa**. Because it does not involve the full thickness of the wall, fistula formation is extremely rare [1]. * **Intestinal Tuberculosis:** While it can mimic Crohn’s (especially the ileocecal involvement), it typically presents with constitutional symptoms like night sweats and fever. While fistulas can occur, they are significantly less common than in Crohn’s. * **Typhoid:** This is an acute febrile illness presenting with "pea-soup" diarrhea, rose spots, and potential intestinal perforation, but it does not cause chronic fistula formation. **3. NEET-PG High-Yield Pearls:** * **Pathology:** Look for **"Skip lesions"** and **non-caseating granulomas** (seen in 40-60% of cases). * **Endoscopy:** Characterized by a **"Cobblestone appearance"** [1] and "Creeping fat" (mesenteric fat wrapping around the bowel). * **Radiology:** The **"String sign of Kantor"** (terminal ileum narrowing) is a classic finding on barium studies [1]. * **Smoking:** Smoking is a risk factor for Crohn’s disease but is protective against Ulcerative Colitis.

Question 394: All of the following are true about Plummer-Vinson syndrome EXCEPT:

A. Esophageal webs
B. Premalignant condition
C. Common in elderly males (Correct Answer)
D. Dysphagia

Explanation: **Plummer-Vinson Syndrome (PVS)**, also known as Paterson-Brown-Kelly syndrome, is a rare clinical triad characterized by iron-deficiency anemia, dysphagia, and esophageal webs. ### **Explanation of the Correct Option** **C. Common in elderly males (Incorrect Statement):** This is the correct answer because PVS is classically seen in **middle-aged women** (typically in the 4th to 7th decades of life). It is rarely seen in males. The gender predilection is often attributed to the higher prevalence of iron deficiency in menstruating or multiparous women. ### **Explanation of Incorrect Options** * **A. Esophageal webs:** These are thin, eccentric, mucosal folds that protrude into the lumen, typically in the **post-cricoid (upper esophagus)** region. They are a hallmark diagnostic feature of PVS. * **B. Premalignant condition:** PVS is a well-recognized risk factor for **Squamous Cell Carcinoma** of the esophagus and pharynx. Approximately 5–10% of patients may develop malignancy, necessitating regular endoscopic surveillance. * **D. Dysphagia:** Patients typically present with painless, intermittent, and progressive dysphagia, primarily to solids. This occurs due to the mechanical obstruction caused by the esophageal web. ### **High-Yield Clinical Pearls for NEET-PG** * **The Triad:** 1. Iron Deficiency Anemia (Microcytic Hypochromic), 2. Esophageal Webs, 3. Dysphagia. * **Associated Features:** Glossitis (smooth red tongue), Koilonychia (spoon-shaped nails), Cheilosis, and Splenomegaly. * **Diagnosis:** **Barium Swallow** (best initial test to visualize the web) or Upper GI Endoscopy. * **Treatment:** Iron supplementation often resolves the dysphagia; however, mechanical dilation of the web via endoscopy may be required if symptoms persist.

Question 395: Oral examination is indicated in which of the following conditions?

A. Peutz-Jeghers syndrome (Correct Answer)
B. Psoriasis
C. Beri-beri
D. Plummer-Vinson syndrome

Explanation: Oral examination is a critical diagnostic step in identifying **Peutz-Jeghers Syndrome (PJS)**. PJS is an autosomal dominant disorder characterized by the mutation of the **STK11 (LKB1)** gene. It is clinically defined by the triad of mucocutaneous pigmentation, gastrointestinal hamartomatous polyps [1], and an increased risk of visceral malignancies. 1. **Why Peutz-Jeghers Syndrome is correct:** The hallmark clinical sign is **melanotic macules** (hyperpigmented spots) found on the lips, buccal mucosa, and perioral area. These spots are often the first clue to diagnosis, appearing in childhood and sometimes fading after puberty, though buccal mucosa lesions usually persist. 2. **Why other options are incorrect:** * **Psoriasis:** Primarily a skin condition (extensor surfaces) and nail disorder; while oral psoriasis exists, it is extremely rare and not a standard indication for oral screening. * **Beri-beri:** Caused by Thiamine (B1) deficiency, it presents with cardiovascular (Wet) or neurological (Dry) symptoms. Oral signs are not characteristic (unlike B2 or B3 deficiencies). * **Plummer-Vinson Syndrome:** While it involves the oral cavity (glossitis), the definitive diagnostic step is an **esophagoscopy or barium swallow** to identify esophageal webs, rather than a simple oral inspection for diagnosis. **NEET-PG High-Yield Pearls:** * **PJS Polyps:** These are **hamartomatous**, most commonly found in the **small intestine** (jejunum) [1]. * **Complications:** The most common complication is **intussusception**. * **Cancer Risk:** Patients have a significantly high lifetime risk of colorectal, pancreatic, breast, and ovarian cancers [1]. * **Mnemonic:** "P" for Pigmentation, "P" for Polyps, "P" for STK11 (on chromosome 19**p**).

Question 396: What condition is characterized by the triad of perioral pigmentation, bowel cancer, and breast cancer?

A. Reiter's disease.
B. Peutz Jegher's syndrome. (Correct Answer)
C. Gardener's syndrome.
D. Scleroderma.

Explanation: **Explanation:** **Peutz-Jeghers Syndrome (PJS)** is an autosomal dominant condition caused by a mutation in the **STK11 (LKB1)** gene on chromosome 19. It is classically defined by the clinical triad of: 1. **Mucocutaneous hyperpigmentation:** Melanin spots typically found on the lips, perioral area, buccal mucosa, and digits. 2. **Gastrointestinal Hamartomatous Polyps:** These are non-cancerous growths but can cause intussusception or bleeding [1]. 3. **Increased Cancer Risk:** While the polyps themselves are hamartomas, patients have a significantly high lifetime risk of developing various malignancies, most notably **colorectal (bowel) cancer**, **breast cancer**, and cancers of the pancreas, ovaries, and testes [1]. **Analysis of Incorrect Options:** * **Reiter’s Disease (Reactive Arthritis):** Characterized by the triad of "can't see, can't pee, can't climb a tree" (Uveitis, Urethritis, and Arthritis). It has no association with pigmentation or bowel polyps. * **Gardner’s Syndrome:** A variant of Familial Adenomatous Polyposis (FAP). While it involves bowel cancer risk, it is characterized by the triad of **Colonic Polyps, Osteomas (mandible), and Soft tissue tumors (desmoids)**. It lacks the perioral pigmentation seen in PJS. * **Scleroderma:** A connective tissue disorder characterized by skin thickening (sclerodactyly) and Raynaud’s phenomenon. It does not present with hamartomatous polyposis or specific perioral pigmentation. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of polyps:** Small intestine (Jejunum). * **Most common complication:** Intussusception (often "lead point" is a polyp). * **Histology:** PJS polyps show a characteristic "arborizing" (tree-like) pattern of smooth muscle. * **Screening:** Regular colonoscopy, upper GI endoscopy, and breast imaging (MRI/Mammography) are mandatory.

Question 397: Which of the following is not a marker of the active replicative phase of chronic hepatitis B?

A. HBV DNA
B. HBV DNA polymerase
C. Anti-HBc (Correct Answer)
D. AST & ALT

Explanation: ### Explanation The active replicative phase of Chronic Hepatitis B is characterized by high viral load, active viral assembly, and ongoing liver injury. To identify this phase, we look for markers of the virus itself or the damage it causes. [1] **Why Anti-HBc is the Correct Answer:** **Anti-HBc (Antibody to Hepatitis B core antigen)** is a marker of **exposure**, not replication. [2] * **IgM anti-HBc** indicates acute infection or a flare. * **IgG anti-HBc** indicates past or chronic infection and persists for life. [2] Because it remains positive regardless of whether the virus is actively replicating or in a dormant (inactive carrier) state, it is not a specific marker for the replicative phase. **Analysis of Incorrect Options:** * **HBV DNA:** This is the most sensitive and quantitative marker of viral replication. High levels (>2,000 IU/mL) signify active replication. [1] * **HBV DNA Polymerase:** This enzyme is required for viral synthesis. Its presence directly correlates with the production of new viral particles. * **AST & ALT:** These aminotransferases are markers of hepatocellular injury. In the replicative phase (specifically the "Immune Clearance" phase), the immune system attacks infected hepatocytes, leading to elevated AST and ALT. **NEET-PG High-Yield Pearls:** 1. **HBeAg:** The classic serological marker for high infectivity and active replication. 2. **Window Period:** The interval where HBsAg and Anti-HBs are both negative; **IgM Anti-HBc** is the only positive marker here. [1] 3. **Inactive Carrier State:** Characterized by HBeAg negative, Anti-HBe positive, low HBV DNA (<2,000 IU/mL), and normal ALT. [2] 4. **Ground Glass Hepatocytes:** Histological hallmark of chronic HBV infection due to HBsAg accumulation in the endoplasmic reticulum.

Question 398: A 85-year-old man presents with severe crampy abdominal pain which is worse after eating, associated with frequent nausea, bloating and watery diarrhoea. His other medical problems include coronary artery disease, hypertension, hypercholesterolemia. He has a 40-pack-year smoking history. Barium enema is as shown. What is the most probable cause?

A. Left ventricular aneurysm
B. Transmural inflammation of the small intestine
C. Progressive pancreatic inflammation
D. Atherosclerosis of the mesenteric arteries (Correct Answer)

Explanation: ***Atherosclerosis of the mesenteric arteries*** - Classic presentation of **intestinal angina** with post-prandial crampy pain, nausea, and diarrhea in an elderly patient with multiple cardiovascular risk factors (smoking, CAD, hypertension). - Barium enema likely shows **thumbprinting pattern** characteristic of **ischemic colitis**, caused by compromised mesenteric blood flow from atherosclerotic narrowing. *Left ventricular aneurysm* - This is a **cardiac complication** that doesn't directly cause gastrointestinal symptoms or bowel ischemia. - Would present with **heart failure symptoms** like dyspnea and chest pain, not abdominal pain and diarrhea. *Transmural inflammation of the small intestine* - Describes **Crohn's disease**, which typically presents in **younger patients** with chronic symptoms and **skip lesions**. - Would show **cobblestone appearance** and strictures on imaging, not the thumbprinting pattern of ischemic colitis. *Progressive pancreatic inflammation* - Refers to **chronic pancreatitis**, which causes **epigastric pain** radiating to the back and **steatorrhea**. - Would show **pancreatic calcifications** and ductal changes on imaging, not colonic thumbprinting on barium enema.

Question 399: Which of the following is an important risk factor for the development of squamous cell carcinoma?

A. Consumption of whisky (Correct Answer)
B. Consumption of beer
C. Barrett's esophagus
D. Esophageal web

Explanation: **Explanation:** The development of **Esophageal Squamous Cell Carcinoma (SCC)** is strongly linked to chronic irritation of the mucosal lining. **1. Why Option A is Correct:** Alcohol consumption is a major risk factor for SCC. However, the risk is significantly higher with **concentrated spirits (like whisky)** compared to beverages with lower alcohol content. High-proof alcohol acts as a direct mucosal irritant and a solvent that facilitates the penetration of other carcinogens (like tobacco) into the esophageal epithelium. In many studies, the risk of SCC increases linearly with the amount and concentration of alcohol consumed. **2. Analysis of Incorrect Options:** * **Option B (Beer):** While all alcohol increases risk, beer has a lower concentration of ethanol compared to whisky. Epidemiological data consistently show a stronger correlation between hard spirits and SCC. * **Option C (Barrett's Esophagus):** This is the classic precursor lesion for **Adenocarcinoma**, not Squamous Cell Carcinoma. It involves intestinal metaplasia (columnar epithelium) due to chronic GERD. * **Option D (Esophageal Web):** While associated with Plummer-Vinson Syndrome (which increases SCC risk), a solitary esophageal web is a less direct or potent risk factor compared to the chronic, systemic insult of heavy spirit consumption. **3. NEET-PG High-Yield Pearls:** * **SCC Risk Factors:** Smoking and Alcohol (synergistic effect), Achalasia cardia, Lye ingestion (highest relative risk), and Tylosis (100% lifetime risk). * **Location:** SCC most commonly involves the **upper and middle thirds** of the esophagus, whereas Adenocarcinoma involves the lower third. * **Dietary Factors:** Deficiencies in Vitamin A, C, and Zinc are also linked to SCC.

Question 400: A 60-year-old man with a known history of hemochromatosis, cirrhosis, and portal hypertension presented to the emergency department with altered mental status. The patient's attendant reported that over the last three days, the patient has become confused. There is no history of melena or hematemesis. For chronic ascites, diet control and spironolactone are being administered regularly. In the past, the patient experienced an episode of variceal bleeding for which he was prescribed propranolol, and no further episodes have occurred. On examination, the patient is not well-oriented to time and place but is oriented to person. He is afebrile, and his vital signs are stable; however, ascites and asterixis are notable. Laboratory investigations show a hemoglobin of 10.1 g/dL, creatinine of 1.4 mg/dL, and blood urea nitrogen of 45 mg/dL. Paracentesis revealed clear fluid with 800 WBC (40% neutrophils). Which statement regarding this condition is false?

A. Ascites is often preceded by infection. (Correct Answer)
B. Clinical features include abdominal pain, fever, leukocytosis, and altered mental status.
C. Ascitic fluid protein is typically 1 gm/dL.
D. Common causative organisms are Gram-negative bacteria.

Explanation: The patient presents with cirrhosis, altered mental status (confusion), asterixis, and paracentesis showing an absolute neutrophil count (ANC) of 320 cells/mm³ (40% of 800). An ANC >250 cells/mm³ is diagnostic of **Spontaneous Bacterial Peritonitis (SBP)**. **1. Why Option A is the Correct (False) Statement:** The statement "Ascites is often preceded by infection" is incorrect because the pathophysiology is reversed. **Ascites precedes the infection.** SBP occurs when pre-existing ascitic fluid becomes infected, usually via transmigration of gut bacteria or hematogenous spread. Ascites itself is caused by portal hypertension and hypoalbuminemia, not by the infection [1]. **2. Analysis of Other Options:** * **Option B:** SBP can be clinically silent, but classic features include fever, abdominal pain/tenderness, and worsening hepatic encephalopathy (altered mental status) [2]. * **Option C:** Low ascitic fluid protein (**<1 g/dL**) is a major risk factor for SBP due to decreased opsonic activity (reduced complement levels) in the fluid. * **Option D:** The most common causative organisms are Gram-negative aerobes, specifically ***Escherichia coli*** (most common) and *Klebsiella pneumoniae*. **3. NEET-PG High-Yield Pearls:** * **Diagnosis:** ANC >250 cells/mm³ is the gold standard. * **Treatment:** Third-generation cephalosporins (e.g., **Cefotaxime**) are the drugs of choice. * **Albumin Therapy:** Administering IV albumin (1.5g/kg on day 1; 1g/kg on day 3) reduces the risk of hepatorenal syndrome and mortality. * **Prophylaxis:** Patients with ascitic protein <1.5 g/dL or a prior episode of SBP should receive long-term prophylaxis with Norfloxacin or Rifaximin.

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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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