Gastroenterology — MCQs
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A 22-year-old woman presents with chronic diarrhea. She has no abdominal discomfort, feels well, and reports no weight loss or systemic symptoms. Physical examination reveals a healthy young woman who is 5'7" tall and weighs 170 lb. The complete physical examination is normal. Which of the following is the most likely cause of a secretory diarrhea in this young woman?
Hypergastrinemia with hypochlorhydria is seen in which of the following conditions?
What is the classification system used for Barrett's esophagus?
Raised gastrin level without an associated increase in acid secretion is seen in which of the following conditions?
A patient complains of chronic constipation. Despite increasing dietary fiber on his physician's advice, the constipation persists. After referral to a gastroenterologist, colonoscopy reveals over fifty 2-3 mm openings into the bowel mucosa. The intervening mucosa appears normal, and no bleeding is observed. Which of the following is the most likely diagnosis?
What is the commonest hepatotropic virus that progresses to chronicity?
Wilson disease can present as?
Which of the following is excluded from the criteria for diagnosing acute pancreatitis?
What is the most likely diagnosis in a patient presenting with diarrhea and acantholysis in urine?
Antiendomysial antibody is used in the screening of which condition?
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 521: A 22-year-old woman presents with chronic diarrhea. She has no abdominal discomfort, feels well, and reports no weight loss or systemic symptoms. Physical examination reveals a healthy young woman who is 5'7" tall and weighs 170 lb. The complete physical examination is normal. Which of the following is the most likely cause of a secretory diarrhea in this young woman?
- A. Surreptitious use of stimulant laxatives (Correct Answer)
- B. Carcinoid tumor
- C. Ulcerative colitis
- D. Lactose deficiency
Explanation: The clinical presentation describes a young woman with **chronic secretory diarrhea** who is otherwise healthy, asymptomatic (no pain or weight loss), and has a normal physical examination. In young patients, especially those without systemic signs of illness, **surreptitious laxative abuse** (Factitious Diarrhea) is a common cause of chronic secretory diarrhea. Stimulant laxatives (e.g., bisacodyl, senna) increase intestinal secretion and motility, leading to high-volume watery stools that persist even during fasting. **Analysis of Options:** * **A. Surreptitious use of stimulant laxatives (Correct):** This is often seen in patients with underlying psychological stressors or eating disorders. The absence of weight loss and abdominal pain in a "healthy-looking" patient is a classic clue. * **B. Carcinoid tumor:** While it causes secretory diarrhea, it is usually associated with the "Carcinoid triad" (flushing, wheezing, and right-sided heart valves) and systemic symptoms, which are absent here. * **C. Ulcerative colitis:** This typically presents with **inflammatory diarrhea**, characterized by blood, mucus, tenesmus, and abdominal cramping. * **D. Lactose deficiency:** This causes **osmotic diarrhea**. A key feature is that the diarrhea improves or resolves with fasting (unlike secretory diarrhea) and is associated with bloating and flatulence. [1] **NEET-PG High-Yield Pearls:** * **Secretory vs. Osmotic Diarrhea:** Secretory diarrhea has a **low stool osmotic gap (<50 mOsm/kg)** and does not stop with fasting. Osmotic diarrhea has a **high gap (>125 mOsm/kg)** and stops with fasting. * **Diagnosis of Laxative Abuse:** Suspect in "medical-adjacent" professionals or young women. Diagnosis is confirmed by a **stool laxative screen** or finding **melanosis coli** (dark pigmentation of the colon) on colonoscopy (specific to anthraquinone laxatives like senna).
Question 522: Hypergastrinemia with hypochlorhydria is seen in which of the following conditions?
- A. Zollinger Ellison Syndrome
- B. VIPoma
- C. Pernicious anemia (Correct Answer)
- D. Glucagonoma
Explanation: The physiological relationship between gastric acid and gastrin is governed by a **negative feedback loop** [1]. Gastrin (secreted by G-cells) stimulates parietal cells to produce hydrochloric acid (HCl). When gastric pH drops, the production of gastrin is inhibited [1]. **Why Pernicious Anemia is correct:** In Pernicious Anemia, there is autoimmune destruction of **gastric parietal cells** [2]. This leads to **hypochlorhydria** (low acid) or achlorhydria. Because there is no acid to provide negative feedback, the G-cells in the antrum undergo hyperplasia and secrete massive amounts of gastrin, resulting in **secondary hypergastrinemia** [1]. **Analysis of Incorrect Options:** * **Zollinger-Ellison Syndrome (ZES):** This is characterized by a gastrin-secreting tumor (Gastrinoma). While it features **hypergastrinemia**, it leads to massive **hyperchlorhydria** (excessive acid), resulting in refractory peptic ulcers [1]. * **VIPoma:** This tumor secretes Vasoactive Intestinal Peptide, leading to "Pancreatic Cholera" (WDHA syndrome: Watery Diarrhea, Hypokalemia, and **Achlorhydria**). However, it is not typically associated with significant hypergastrinemia. * **Glucagonoma:** This alpha-cell tumor presents with the "6Ds" (Diabetes, Dermatitis/NME, Depression, DVT, etc.). It does not primarily affect the gastrin-acid axis. **High-Yield Clinical Pearls for NEET-PG:** * **Hypergastrinemia + High Acid:** Zollinger-Ellison Syndrome, Antral G-cell hyperplasia, Retained antrum syndrome. * **Hypergastrinemia + Low Acid:** Pernicious anemia, Chronic Atrophic Gastritis (Type A) [2], Long-term Proton Pump Inhibitor (PPI) use. * **Pernicious Anemia** is also associated with Vitamin B12 deficiency (due to lack of Intrinsic Factor) and an increased risk of **Gastric Carcinoid tumors** (due to chronic gastrin stimulation of ECL cells).
Question 523: What is the classification system used for Barrett's esophagus?
- A. McCormack
- B. Tanoue
- C. Prague (Correct Answer)
- D. Amsterdam
Explanation: **Explanation:** The **Prague C & M Criteria** is the internationally recognized classification system used to standardize the endoscopic assessment of **Barrett’s Esophagus (BE)**. It relies on two primary measurements: 1. **C (Circumferential):** The length of the esophagus where the entire circumference is lined by columnar epithelium. 2. **M (Maximal):** The maximum length of the columnar-lined esophagus, including any proximal tongues or islands. These measurements are taken from the gastroesophageal junction (top of the gastric folds) to the proximal extent of the metaplastic change. This system provides high inter-observer reliability, which is crucial for monitoring disease progression and response to therapy. **Analysis of Incorrect Options:** * **McCormack:** This classification is used to grade the severity of **Portal Hypertensive Gastropathy (PHG)** based on endoscopic appearance (e.g., snake-skin pattern). * **Tanoue:** This is a classification system for **Esophageal Varices**, specifically focusing on the tortuosity and color of the vessels. * **Amsterdam:** These are criteria used to identify families at high risk for **Lynch Syndrome** (Hereditary Non-Polyposis Colorectal Cancer - HNPCC). **High-Yield Clinical Pearls for NEET-PG:** * **Definition of BE:** Intestinal metaplasia (presence of **Goblet cells**) of the lower esophagus [1]. * **Histology:** Squamous epithelium is replaced by Columnar epithelium [1]. * **Surveillance:** Patients with BE require periodic endoscopy with the **Seattle Protocol** (4-quadrant biopsies every 1–2 cm) to screen for dysplasia or adenocarcinoma. * **Risk Factor:** Chronic GERD is the primary driver; BE increases the risk of **Esophageal Adenocarcinoma** by 30-40 times [1].
Question 524: Raised gastrin level without an associated increase in acid secretion is seen in which of the following conditions?
- A. Carcinoma stomach
- B. Gastrinoma
- C. Pernicious anemia (Correct Answer)
- D. G cell hyperplasia
Explanation: ### Explanation The correct answer is **Pernicious Anemia**. #### 1. Why Pernicious Anemia is Correct The physiological regulation of gastrin follows a negative feedback loop: high gastric acid (low pH) inhibits gastrin release, while low gastric acid (high pH) stimulates it [1]. In **Pernicious Anemia**, autoimmune destruction of gastric parietal cells [2] leads to **achlorhydria** (absence of HCl). The lack of acid removes the inhibitory feedback on G-cells in the antrum, resulting in **reactive hypergastrinemia** [1]. Thus, you see high gastrin levels with low/absent acid secretion. #### 2. Why Other Options are Incorrect * **Gastrinoma (Zollinger-Ellison Syndrome):** This is a gastrin-secreting tumor. It causes high gastrin levels which *directly* stimulate parietal cells to produce **massive amounts of acid**, leading to severe peptic ulcers [1]. * **G-cell Hyperplasia:** This involves an increased number of G-cells, leading to excessive gastrin production and a subsequent **increase in acid secretion** (mimicking ZES). * **Carcinoma Stomach:** While some gastric cancers (like those in the antrum) might decrease acid if they destroy parietal cell mass, they do not classically present with the profound hypergastrinemia seen in primary achlorhydric states like pernicious anemia. #### 3. NEET-PG High-Yield Pearls * **Hypergastrinemia with High Acid:** Gastrinoma (ZES), G-cell hyperplasia, Retained antrum syndrome, Gastric outlet obstruction. * **Hypergastrinemia with Low Acid:** Pernicious anemia (Type A Gastritis), Long-term PPI use, Atrophic gastritis [1]. * **Secretin Stimulation Test:** This is the gold standard to differentiate ZES from other causes of high gastrin. In ZES, gastrin levels **rise** after secretin injection; in other conditions, gastrin levels fall or remain stale. * **Pernicious Anemia Triad:** Megaloblastic anemia + Achlorhydria + Vitamin B12 deficiency (due to lack of Intrinsic Factor).
Question 525: A patient complains of chronic constipation. Despite increasing dietary fiber on his physician's advice, the constipation persists. After referral to a gastroenterologist, colonoscopy reveals over fifty 2-3 mm openings into the bowel mucosa. The intervening mucosa appears normal, and no bleeding is observed. Which of the following is the most likely diagnosis?
- A. Amebiasis
- B. Crohn disease
- C. Diverticulosis (Correct Answer)
- D. Pseudomembranous colitis
Explanation: **Explanation:** The clinical presentation and endoscopic findings are classic for **Diverticulosis**. Diverticula are acquired herniations of the colonic mucosa and submucosa through the muscularis propria, typically occurring at points where nutrient arteries (*vasa recta*) penetrate the muscular layer. **Why Diverticulosis is correct:** * **Endoscopic Appearance:** The "2-3 mm openings" described are the orifices of the diverticular sacs. The fact that the "intervening mucosa appears normal" is a pathognomonic finding for uncomplicated diverticulosis, distinguishing it from inflammatory conditions. * **Clinical Context:** Chronic constipation leads to increased intraluminal pressure (due to the Law of Laplace), which forces the mucosa through weak points in the colon wall. While fiber often helps, it may not resolve symptoms if structural changes are already extensive. [1] **Why other options are incorrect:** * **Amebiasis:** Characteristically presents with "flask-shaped ulcers" and inflamed mucosa, often associated with bloody diarrhea, not chronic constipation. * **Crohn Disease:** An inflammatory bowel disease (IBD) characterized by "cobblestone appearance," deep linear ulcers, and skip lesions. The intervening mucosa is rarely normal in active disease. * **Pseudomembranous Colitis:** Caused by *C. difficile*, it presents with raised yellow-white plaques (pseudomembranes) on an erythematous base, typically following antibiotic use. **NEET-PG High-Yield Pearls:** * **Most common site:** Sigmoid colon (due to the narrowest diameter and highest pressure). * **Risk Factors:** Low-fiber diet, obesity, and advancing age. * **Complications:** Diverticulitis (inflammation) and painless lower GI bleeding (diverticular hemorrhage). [1] * **Investigation of Choice:** CT scan is preferred for acute diverticulitis; Colonoscopy is contraindicated in the acute phase due to perforation risk but is used for routine diagnosis of diverticulosis. [1]
Question 526: What is the commonest hepatotropic virus that progresses to chronicity?
- A. HEV
- B. HAV
- C. HBV
- D. HCV (Correct Answer)
Explanation: **Explanation:** The correct answer is **HCV (Hepatitis C Virus)**. The primary factor determining "chronicity" is the virus's ability to evade the host immune response and persist in the liver for more than six months. **Why HCV is the correct answer:** HCV has the highest rate of progression to chronic infection among all hepatotropic viruses. Approximately **75%–85%** of individuals infected with HCV fail to clear the virus acutely and develop chronic hepatitis [1]. This high rate of chronicity is largely due to the virus's high mutation rate (quasispecies), which allows it to stay ahead of the host’s immune system [1]. **Analysis of Incorrect Options:** * **HAV (Hepatitis A) & HEV (Hepatitis E):** These are transmitted via the fecal-oral route and typically cause acute, self-limiting illness. They **do not** progress to chronicity in immunocompetent individuals [2]. (Note: HEV can cause chronic infection specifically in organ transplant recipients or immunocompromised patients). * **HBV (Hepatitis B):** While HBV can become chronic, the rate depends heavily on the age of acquisition. In adults, only about **5%** of infections become chronic [1]. Although the absolute number of chronic HBV carriers is high globally, the *probability* of an individual infection progressing to chronicity is significantly lower than that of HCV [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Highest risk of chronicity:** HCV (up to 85%) [1]. * **Highest risk of Fulminant Hepatic Failure in pregnancy:** HEV. * **HBV Chronicity Risk:** 90% in neonates (vertical transmission), 20-30% in children, and <5% in adults [1]. * **HCV Screening:** Anti-HCV antibody is the screening test; HCV-RNA (PCR) is the gold standard for confirming active infection [1]. * **DNA vs. RNA:** HBV is the only DNA hepatotropic virus; all others (A, C, D, E) are RNA viruses.
Question 527: Wilson disease can present as?
- A. Dystonia
- B. Fulminant hepatitis
- C. Repeated spontaneous abortion
- D. All of the above (Correct Answer)
Explanation: **Explanation:** Wilson Disease (Hepatolenticular Degeneration) is an autosomal recessive disorder caused by a mutation in the **ATP7B gene** on chromosome 13 [1]. This leads to impaired biliary copper excretion and toxic accumulation in various organs, primarily the liver, brain, and cornea [1]. * **Dystonia (Neurological):** Copper deposition in the basal ganglia (specifically the putamen) leads to extrapyramidal symptoms. Dystonia is a classic feature, often presenting as "Risus Sardonicus" (a fixed, grimacing smile) or tremors [1]. * **Fulminant Hepatitis (Hepatic):** In young patients, Wilson disease can present as acute liver failure with Coombs-negative hemolytic anemia [1]. This is a medical emergency and often requires liver transplantation. * **Repeated Spontaneous Abortion (Endocrine/Gynecological):** Excess free copper is toxic to the endometrium and can disrupt the hormonal milieu, leading to infertility or recurrent pregnancy loss in females. Since all three clinical scenarios are documented manifestations of the disease, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Kayser-Fleischer (KF) Rings:** Copper deposition in the **Descemet’s membrane** of the cornea (best seen on slit-lamp exam). * **Diagnosis:** Low serum ceruloplasmin (<20 mg/dL), increased 24-hour urinary copper excretion (>100 μg), and increased hepatic copper content on biopsy (Gold Standard). * **Treatment:** Chelating agents like **D-Penicillamine** (first-line historically) or **Trientine**. Zinc is used for maintenance therapy as it interferes with intestinal copper absorption. * **Radiology:** "Face of the Giant Panda" sign on MRI brain.
Question 528: Which of the following is excluded from the criteria for diagnosing acute pancreatitis?
- A. Typical epigastric abdominal pain
- B. Threefold elevation in serum amylase levels
- C. Cullen's sign (Correct Answer)
- D. Imaging findings suggestive of pancreatitis
Explanation: The diagnosis of acute pancreatitis is based on the **Revised Atlanta Criteria (2012)**. To establish a diagnosis, at least **two of the following three** criteria must be met: 1. **Clinical:** Acute onset of persistent, severe, epigastric pain often radiating to the back [1]. 2. **Biochemical:** Serum amylase and/or lipase levels ≥3 times the upper limit of normal. 3. **Radiological:** Characteristic findings of acute pancreatitis on contrast-enhanced computed tomography (CECT), MRI, or transabdominal ultrasound [1]. **Why Cullen’s Sign is the correct answer:** While **Cullen’s sign** (periumbilical ecchymosis) and **Grey Turner’s sign** (flank ecchymosis) are classic physical exam findings associated with hemorrhagic pancreatitis, they are **not** part of the formal diagnostic criteria. These signs are non-specific (can occur in ruptured ectopic pregnancy or AAA) and typically appear late, making them poor diagnostic markers. **Analysis of Incorrect Options:** * **Option A & B:** These represent the clinical and biochemical pillars of the Atlanta Criteria. Lipase is generally preferred over amylase due to its higher sensitivity and longer half-life. * **Option D:** Imaging is the third pillar. Note that if the first two criteria are met, imaging is often not required for initial diagnosis [1] but is used to assess complications or if the diagnosis is uncertain. **High-Yield Clinical Pearls for NEET-PG:** * **Serum Lipase** is more specific and remains elevated longer (7–14 days) than amylase. * The **degree of enzyme elevation** does not correlate with the severity of the disease. * **Most common cause:** Gallstones (Global/India), followed by Alcohol. * **Drug-induced causes:** Azathioprine, Valproate, Thiazides, and Estrogens.
Question 529: What is the most likely diagnosis in a patient presenting with diarrhea and acantholysis in urine?
- A. Whipple's disease
- B. Celiac sprue
- C. Abetalipoproteinemia (Correct Answer)
- D. Ulcerative colitis
Explanation: **Abetalipoproteinemia** (Bassen-Kornzweig syndrome) is an autosomal recessive disorder caused by a mutation in the **Microsomal Triglyceride Transfer Protein (MTP)** gene. This defect prevents the assembly and secretion of apolipoprotein B-containing lipoproteins (ApoB-48 and ApoB-100) [2]. 1. **Why it is correct:** The absence of ApoB-48 leads to the failure of chylomicron formation in enterocytes, resulting in fat malabsorption and **steatorrhea (diarrhea)**. The lack of ApoB-100 leads to a deficiency in VLDL and LDL. This causes a significant alteration in the lipid composition of red blood cell membranes, leading to the formation of **acanthocytes** (spur cells). When these cells are shed or filtered, they can be identified as **acantholysis in urine** (or more commonly, acanthocytes on a peripheral smear). 2. **Why other options are incorrect:** * **Whipple’s Disease:** Caused by *Tropheryma whipplei*; presents with diarrhea, weight loss, and arthralgia [1]. Diagnosis is via PAS-positive macrophages in the lamina propria, not acanthocytes [1]. * **Celiac Sprue:** An immune-mediated gluten sensitivity causing malabsorption. While it causes diarrhea, it is associated with dermatitis herpetiformis and specific antibodies (anti-tTG), not acantholysis. * **Ulcerative Colitis:** An inflammatory bowel disease presenting with bloody diarrhea and tenesmus. It does not involve lipid metabolism defects or acanthocyte formation. **High-Yield Clinical Pearls for NEET-PG:** * **Biopsy finding:** Enterocytes loaded with lipid vacuoles (clear cytoplasm) after a fatty meal. * **Clinical Triad:** Fat malabsorption, Retinitis Pigmentosa, and Ataxia (due to Vitamin E deficiency) [2]. * **Laboratory:** Extremely low cholesterol and triglyceride levels; absent VLDL, LDL, and chylomicrons.
Question 530: Antiendomysial antibody is used in the screening of which condition?
- A. Myasthenia gravis
- B. Autoimmune hepatitis
- C. Coeliac disease (Correct Answer)
- D. Graves disease
Explanation: **Explanation:** **Coeliac Disease (Correct Answer):** Anti-endomysial antibody (EMA) is a highly specific serological marker for Coeliac disease [1]. It is an IgA-class antibody directed against **tissue transglutaminase (tTG)** located in the endomysium (the connective tissue sheath surrounding muscle fibers) [1]. * **Gold Standard Screening:** While **IgA anti-tTG** is the preferred initial screening test due to its high sensitivity and lower cost, **IgA Anti-endomysial antibody** has a specificity approaching 100%, making it excellent for confirming a positive screening result before proceeding to a small bowel biopsy. **Incorrect Options:** * **Myasthenia Gravis:** Characterized by antibodies against **acetylcholine receptors (AChR)** or muscle-specific kinase (MuSK) at the neuromuscular junction. * **Autoimmune Hepatitis:** Associated with **Anti-nuclear antibodies (ANA)** and **Anti-smooth muscle antibodies (ASMA)** in Type 1, and **Anti-liver kidney microsomal-1 (LKM-1)** antibodies in Type 2 [2]. * **Graves Disease:** Caused by **Thyroid-stimulating immunoglobulin (TSI)** which acts as an agonist to the TSH receptor. **High-Yield Clinical Pearls for NEET-PG:** 1. **Total IgA levels** must be checked alongside Coeliac serology. If a patient is IgA deficient (common in Coeliac), IgA-based tests (EMA/tTG) will be falsely negative; in such cases, **IgG-based tests** (IgG-tTG or IgG-DGP) should be used. 2. **HLA Association:** Coeliac disease is strongly associated with **HLA-DQ2** (95%) and **HLA-DQ8** [1]. 3. **Biopsy Finding:** The characteristic histological feature is **villous atrophy**, crypt hyperplasia, and increased intraepithelial lymphocytes (Marsh Classification) [1]. 4. **Dermatitis Herpetiformis:** The pathognomonic skin manifestation of Coeliac disease, showing granular IgA deposits on skin biopsy.
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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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