Gastroenterology — MCQs
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A 20-year-old male has presented with repeated episodes of hematemesis. There is no history of jaundice or liver decompensation. On examination, the significant findings include splenomegaly (8 cm below the costal margin) and the presence of esophageal varices. There is no ascites or peptic ulceration. The liver function tests are normal. What is the most likely diagnosis?
Which of the following is a common condition affecting the feline esophagus?
Anchovy sauce-like material is associated with which of the following conditions?
A 55-year-old female presents with painful chronic diarrhea, multiple recurrent duodenal ulcers, and increased basal gastric acid output. What is the most likely diagnosis?
Hepatic encephalopathy is aggravated by all except?
A 43-year-old woman presents with chronic dysphagia and gastroesophageal reflux. Endoscopic examination reveals achalasia of the cardia. What is the most likely cause of this condition?
All of the following are true about Crohn's disease EXCEPT:
Cobblestoning of the intestine and the string sign of Kantor are classic findings in which condition?
Secretory diarrhea is not seen in which of the following conditions?
Which of the following statements regarding Plummer Vinson syndrome is NOT true?
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 131: A 20-year-old male has presented with repeated episodes of hematemesis. There is no history of jaundice or liver decompensation. On examination, the significant findings include splenomegaly (8 cm below the costal margin) and the presence of esophageal varices. There is no ascites or peptic ulceration. The liver function tests are normal. What is the most likely diagnosis?
- A. Extrahepatic portal venous obstruction
- B. Non-cirrhotic portal fibrosis (Correct Answer)
- C. Cirrhosis
- D. Hepatic venous outflow tract obstruction
Explanation: ### Explanation The clinical presentation describes **Non-Cirrhotic Portal Fibrosis (NCPF)**, a condition characterized by idiopathic portal hypertension in the presence of a patent portal vein and normal liver function. **1. Why the Correct Answer is Right:** NCPF typically presents in young to middle-aged adults with features of **portal hypertension** (massive splenomegaly and esophageal varices) but with **preserved liver function**. The hallmark is the absence of cirrhosis (normal LFTs, no jaundice) and the absence of liver decompensation (no ascites or encephalopathy) [2]. In India, it is a common cause of upper GI bleed. The pathology involves obliterative venopathy of the intrahepatic portal vein branches. **2. Why the Other Options are Wrong:** * **Extrahepatic Portal Venous Obstruction (EHPVO):** While it also presents with normal LFTs and varices, it is most common in **children**. Crucially, the portal vein is thrombosed/obstructed in EHPVO, whereas in NCPF, the extrahepatic portal vein remains patent. * **Cirrhosis:** This is ruled out by the **normal liver function tests** and the absence of stigmata of chronic liver disease (jaundice, ascites, or shrunken liver) [1]. Cirrhosis typically shows deranged albumin and coagulation profiles. * **Hepatic Venous Outflow Tract Obstruction (Budd-Chiari Syndrome):** This usually presents with a triad of abdominal pain, **ascites**, and hepatomegaly [3]. The absence of ascites and the presence of normal LFTs make this diagnosis unlikely. **3. High-Yield Clinical Pearls for NEET-PG:** * **NCPF vs. EHPVO:** Both have "Normal LFTs + Splenomegaly." Differentiate by age (EHPVO = Children; NCPF = Adults) and imaging (EHPVO shows Portal Cavernoma). * **NCPF vs. Cirrhosis:** NCPF has a much better prognosis because the "factory" (liver parenchyma) is still functioning. * **Schistosomiasis:** Globally, this is the most common cause of non-cirrhotic portal hypertension, but in the Indian context, NCPF/IPH (Idiopathic Portal Hypertension) is the preferred answer.
Question 132: Which of the following is a common condition affecting the feline esophagus?
- A. Eosinophilic Esophagitis (Correct Answer)
- B. Gastroesophageal Reflux Disease (GERD)
- C. Radiation esophagitis
- D. Diffuse esophageal spasm
Explanation: **Explanation:** The term **"Feline Esophagus"** refers to a characteristic endoscopic or radiological finding of **transverse mucosal folds or rings** in the distal esophagus, resembling the anatomy of a cat's esophagus. **1. Why Eosinophilic Esophagitis (EoE) is correct:** In humans, the feline appearance is a classic diagnostic hallmark of **Eosinophilic Esophagitis**. It occurs due to chronic inflammation and remodeling of the esophageal wall, leading to subepithelial fibrosis and muscular contraction. This results in "fixed" or "transient" concentric rings (also called **trachealization of the esophagus**). Identifying these rings during endoscopy is a high-yield clinical sign for EoE, often accompanied by linear furrows and white exudates (eosinophilic abscesses). **2. Analysis of Incorrect Options:** * **B. GERD:** While GERD is the most common cause of esophagitis, it typically presents with erosions, ulcerations, or Barrett’s esophagus rather than concentric feline rings. * **C. Radiation Esophagitis:** This usually presents with acute mucosal friability or chronic stricture formation rather than organized transverse rings. * **D. Diffuse Esophageal Spasm (DES):** DES is characterized by a "Corkscrew" or "Rosary bead" appearance on a barium swallow due to non-peristaltic contractions, which is distinct from the feline mucosal folds. **3. NEET-PG High-Yield Pearls:** * **Diagnosis of EoE:** Requires ≥15 eosinophils per high-power field (hpf) on esophageal biopsy. * **Clinical Presentation:** Most common in young males presenting with **food impaction** and dysphagia. * **Management:** First-line treatments include the "3 Ds": **D**ietary elimination, **D**rugs (Proton Pump Inhibitors or topical steroids like Fluticasone), and **D**ilation (if strictures are present).
Question 133: Anchovy sauce-like material is associated with which of the following conditions?
- A. Amoebic colitis
- B. Amoebiasis cutis
- C. Amoebic liver abscess (Correct Answer)
- D. Pulmonary amoebiasis
Explanation: **Explanation:** The characteristic **"anchovy sauce"** appearance is the classic description of the pus aspirated from an **Amoebic Liver Abscess (ALA)** [1]. This condition is caused by the protozoan *Entamoeba histolytica*, which reaches the liver via the portal circulation from the colon. **Why it is the correct answer:** The "anchovy sauce" appearance is due to the liquefactive necrosis of hepatocytes [1]. The aspirated material is typically odorless, thick, and chocolate-brown or reddish-brown in color. It is composed of necrotic liver tissue, blood, and debris. Notably, the pus itself is usually sterile; the active trophozoites are found in the peripheral walls of the abscess cavity rather than the central necrotic material. **Why the other options are incorrect:** * **Amoebic colitis:** Presents with "flask-shaped ulcers" in the colon and bloody diarrhea (dysentery), but does not produce this specific necrotic material [1]. * **Amoebiasis cutis:** Refers to cutaneous involvement (usually perianal), presenting as painful, sloughing ulcers with undermined edges [1]. * **Pulmonary amoebiasis:** Usually occurs due to the rupture of a liver abscess through the diaphragm [2]. While it can result in "chocolate-colored" sputum (if a hepatobronchial fistula forms), the primary association of the term "anchovy sauce" is with the liver abscess itself. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Right lobe of the liver (due to the bulk of portal blood flow). * **Investigation of choice:** Ultrasound (shows a hypoechoic lesion); however, **Contrast-Enhanced CT (CECT)** is more sensitive. * **Treatment of choice:** Metronidazole or Tinidazole, followed by a luminal amoebicide (e.g., Diloxanide furoate) to eradicate the intestinal carrier state. * **Aspiration indication:** Only if the abscess is large (>10 cm), involves the left lobe (risk of rupture into the pericardium), or fails to respond to medical therapy [2].
Question 134: A 55-year-old female presents with painful chronic diarrhea, multiple recurrent duodenal ulcers, and increased basal gastric acid output. What is the most likely diagnosis?
- A. A gastrin-secreting tumor of the pancreas (Correct Answer)
- B. A serotonin-secreting tumor of the ileum
- C. A somatostatin-secreting tumor of the duodenum
- D. An epinephrine-secreting tumor of the adrenal medulla
Explanation: ### Explanation The clinical presentation of **recurrent, refractory peptic ulcers**, **chronic diarrhea**, and **increased basal gastric acid output** is the classic triad of **Zollinger-Ellison Syndrome (ZES)**. **Why Option A is correct:** ZES is caused by a **gastrinoma**, a gastrin-secreting neuroendocrine tumor most commonly located in the "gastrinoma triangle" [1]. Excessive gastrin leads to massive hypertrophy of gastric parietal cells, resulting in hypersecretion of gastric acid [2]. This causes: 1. **Multiple/Atypical Ulcers:** Often distal to the bulb or recurrent despite therapy [2]. 2. **Diarrhea:** High acid volume denatures pancreatic enzymes (lipase) and damages the intestinal mucosa, leading to malabsorption and steatorrhea. **Why other options are incorrect:** * **Option B (Carcinoid Tumor):** Serotonin-secreting tumors cause Carcinoid Syndrome (flushing, wheezing, right-sided heart lesions), not peptic ulcers or hyperchlorhydria [1]. * **Option C (Somatostatinoma):** Somatostatin inhibits gastric acid [2]. A somatostatinoma typically presents with the "inhibitory triad": diabetes mellitus, cholelithiasis, and steatorrhea. * **Option D (Pheochromocytoma):** Epinephrine/Norepinephrine secretion causes episodic hypertension, palpitations, and diaphoresis, not primary GI ulceration. ### High-Yield NEET-PG Pearls * **Best Initial Test:** Fasting Serum Gastrin (>1000 pg/mL is diagnostic). * **Most Sensitive Provocative Test:** Secretin Stimulation Test (Gastrin rises >200 pg/mL). * **Association:** 25% of cases are associated with **MEN-1 syndrome** (3Ps: Parathyroid, Pancreas, Pituitary). * **Localization:** Somatostatin receptor scintigraphy (OctreoScan) or Endoscopic Ultrasound (EUS) are preferred for tumor localization.
Question 135: Hepatic encephalopathy is aggravated by all except?
- A. Hyperkalemia (Correct Answer)
- B. Anemia
- C. Hyperthyroidism
- D. Barbiturates
Explanation: Hepatic encephalopathy (HE) is a reversible neuropsychiatric syndrome caused by liver failure and/or portosystemic shunting [1]. It is primarily driven by the accumulation of neurotoxins, most notably **ammonia ($NH_3$)** [1]. **Why Hyperkalemia is the correct answer:** Hyperkalemia does **not** aggravate HE. In fact, it is **Hypokalemia** that is a well-known precipitant. When potassium levels are low, the body attempts to preserve $K^+$ by exchanging intracellular $H^+$ ions for extracellular $K^+$. This results in intracellular acidosis, which stimulates renal ammoniagenesis (production of $NH_3$). Furthermore, low $K^+$ leads to systemic alkalosis, which shifts the equilibrium from ammonium ($NH_4^+$) to ammonia ($NH_3$). Unlike $NH_4^+$, $NH_3$ is non-ionized and can easily cross the blood-brain barrier, worsening encephalopathy. **Analysis of Incorrect Options:** * **Anemia:** Severe anemia causes tissue hypoxia, including cerebral hypoxia, which can exacerbate the neurological symptoms of HE. Additionally, GI bleeding (a cause of acute anemia) provides a massive protein load to the gut, which is converted into ammonia by bacteria. * **Hyperthyroidism:** Thyrotoxicosis increases the metabolic rate and protein catabolism, leading to increased nitrogenous waste and ammonia production, thereby worsening HE. * **Barbiturates:** These are CNS depressants. In liver failure, the metabolism of sedatives and hypnotics is significantly reduced. These drugs have a synergistic effect with endogenous neurotoxins (like GABA-like substances), leading to profound sedation and coma. **NEET-PG High-Yield Pearls:** * **Most common precipitant of HE:** Infections (e.g., SBP) and GI Bleeding. * **Acid-Base status:** Metabolic alkalosis (often due to diuretics) precipitates HE. * **Treatment of choice:** Lactulose (converts $NH_3$ to $NH_4^+$ and acts as an osmotic laxative) and Rifaximin (reduces ammonia-producing gut flora).
Question 136: A 43-year-old woman presents with chronic dysphagia and gastroesophageal reflux. Endoscopic examination reveals achalasia of the cardia. What is the most likely cause of this condition?
- A. Failure of relaxation of the lower esophageal sphincter (Correct Answer)
- B. Dyspepsia
- C. Gastritis
- D. Gastroparesis
Explanation: **Explanation:** **Achalasia cardia** 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. **Why Option A is correct:** The underlying pathophysiology involves the **degeneration of the myenteric (Auerbach’s) plexus** in the esophageal wall. This leads to a loss of inhibitory nitrergic neurons (which release Nitric Oxide and VIP), resulting in a hypertensive LES that fails to relax in response to swallowing. This functional obstruction causes the proximal esophagus to dilate, leading to the classic "Bird’s beak" appearance on barium swallow. **Why the other options are incorrect:** * **B. Dyspepsia:** This is a clinical symptom (indigestion/epigastric pain) rather than a structural or motility disorder. * **C. Gastritis:** This refers to inflammation of the gastric mucosa, which does not affect esophageal motility or LES relaxation. * **D. Gastroparesis:** This is delayed gastric emptying in the absence of mechanical obstruction, typically seen in diabetics. While it involves autonomic dysfunction, it does not cause the specific LES failure seen in achalasia. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow:** Shows "Bird’s beak" or "Rat-tail" appearance. * **Triad of Achalasia:** 1. Incomplete LES relaxation, 2. Increased LES resting tone, 3. Aperistalsis. * **Treatment of Choice:** Heller’s Myotomy (surgical) or POEM (Peroral Endoscopic Myotomy). * **Association:** Increased risk of Squamous Cell Carcinoma of the esophagus.
Question 137: All of the following are true about Crohn's disease EXCEPT:
- A. It has transmural involvement.
- B. The creeping fat sign is seen.
- C. Lesions are discontinuous and associated with backwash ileitis. (Correct Answer)
- D. The earliest finding in Crohn's disease is an aphthous ulcer.
Explanation: The correct answer is **C** because it combines a true feature of Crohn’s Disease (CD) with a characteristic feature of Ulcerative Colitis (UC), making the statement false. [1] 1. **Why Option C is the correct answer (False statement):** While Crohn’s disease is characterized by **discontinuous (skip) lesions**, the term **"backwash ileitis"** refers specifically to Ulcerative Colitis. In UC, which primarily affects the colon, inflammation can occasionally involve the terminal ileum due to an incompetent ileocecal valve, leading to superficial inflammation known as backwash ileitis. In contrast, ileal involvement in Crohn’s is primary, transmural, and often leads to strictures [1]. 2. **Analysis of Incorrect Options (True statements):** * **Option A:** CD is characterized by **transmural inflammation**, meaning it affects all layers of the bowel wall (mucosa to serosa), leading to complications like fistulas and perforations [1]. * **Option B:** **Creeping fat** (mesenteric fat wrapping around the bowel) is a pathognomonic surgical finding in CD, resulting from chronic transmural inflammation. [3] * **Option C:** The **earliest macroscopic lesion** seen on endoscopy in Crohn’s disease is indeed an **aphthous ulcer**. These can later coalesce to form deep, longitudinal "rake-like" ulcers. [3] **High-Yield Clinical Pearls for NEET-PG:** * **String Sign of Kantor:** Seen on barium studies due to terminal ileum strictures in CD. [2] * **Cobblestone Appearance:** Result of deep ulcers intersecting with islands of edematous mucosa. * **Granulomas:** Non-caseating granulomas are a hallmark histological finding in CD (absent in UC). [1] * **ASCA vs. p-ANCA:** CD is typically **ASCA positive**, while UC is **p-ANCA positive**.
Question 138: Cobblestoning of the intestine and the string sign of Kantor are classic findings in which condition?
- A. Crohn's disease (Correct Answer)
- B. Ulcerative colitis
- C. Ischemic colitis
- D. Amoebic colitis
Explanation: ### Explanation **Correct Answer: A. Crohn's disease** **Medical Concept:** Crohn’s disease is a chronic inflammatory bowel disease characterized by **transmural inflammation** and **skip lesions** (discontinuous involvement) [1]. * **Cobblestoning:** This appearance occurs due to deep, longitudinal, and transverse aphthous ulcers that intersect, leaving islands of normal, edematous mucosa between them. * **String Sign of Kantor:** This is a classic radiological finding on a barium meal follow-through [1]. It represents significant narrowing of the terminal ileum due to severe inflammation, edema, and subsequent fibrosis (stricture formation), making the lumen appear as a thin "string" [1]. **Why Incorrect Options are Wrong:** * **B. Ulcerative Colitis:** This involves only the mucosa and submucosa (not transmural) and is continuous [1]. Classic findings include "Lead pipe appearance" (loss of haustrations) and pseudopolyps, but not cobblestoning or the string sign [1]. * **C. Ischemic Colitis:** Typically presents with "Thumbprinting" on imaging due to submucosal hemorrhage and edema, usually at splenic flexure (Griffith's point). * **D. Amoebic Colitis:** Characterized by "Flask-shaped ulcers" on histopathology. It does not cause the transmural fibrosis required for the string sign. **NEET-PG High-Yield Pearls:** * **Most common site:** Terminal ileum (hence the string sign is most common here) [1]. * **Histology:** Non-caseating granulomas (pathognomonic, seen in 40-60%). * **Creeping Fat:** Mesenteric fat wraps around the bowel surface, a specific surgical finding in Crohn's. * **Complications:** Fistulae and perianal disease are much more common in Crohn's than in UC [1]. * **ASCA (Anti-Saccharomyces cerevisiae antibody):** Positive in Crohn’s (vs. p-ANCA in UC).
Question 139: Secretory diarrhea is not seen in which of the following conditions?
- A. Phenolphthalein
- B. Celiac disease (Correct Answer)
- C. Cholera
- D. Addison's Disease
Explanation: **Explanation:** The correct answer is **Celiac disease** because it is a classic example of **Malabsorptive/Osmotic diarrhea**, not secretory diarrhea. ### 1. Why Celiac Disease is the Correct Answer: In Celiac disease, gluten ingestion leads to immune-mediated destruction of small intestinal villi (villous atrophy) [1]. This reduces the surface area for absorption, leading to unabsorbed solutes remaining in the intestinal lumen [1]. These solutes exert an osmotic pull, drawing water into the gut. Characteristically, osmotic diarrhea **improves with fasting** and presents with an **increased stool osmotic gap** (>125 mOsm/kg). ### 2. Analysis of Incorrect Options (Causes of Secretory Diarrhea): Secretory diarrhea occurs due to active secretion of electrolytes (mainly $Cl^-$) or inhibition of $Na^+$ absorption. It does **not** improve with fasting and has a **low stool osmotic gap** (<50 mOsm/kg). * **Phenolphthalein:** This is a stimulant laxative. Like bisacodyl or senna, it induces secretory diarrhea by stimulating mucosal cAMP and altering electrolyte transport. * **Cholera:** *Vibrio cholerae* toxin permanently activates adenylate cyclase, leading to massive secretion of isotonic fluid into the lumen (Rice-water stools). * **Addison’s Disease:** Adrenal insufficiency leads to mineralocorticoid deficiency. The lack of aldosterone results in decreased sodium reabsorption and increased potassium secretion in the gut, contributing to a secretory-type diarrheal pattern. ### 3. High-Yield Clinical Pearls for NEET-PG: * **Stool Osmotic Gap Formula:** $290 - 2 \times (\text{Stool } Na^+ + \text{Stool } K^+)$. * **Secretory Diarrhea:** Gap <50 mOsm/kg. Causes: VIPoma (WDHA syndrome), Carcinoid, Cholera, Bile acid malabsorption. * **Osmotic Diarrhea:** Gap >125 mOsm/kg. Causes: Lactase deficiency, Celiac disease, Magnesium ingestion [2]. * **Key Distinguisher:** If the diarrhea persists during a 48-hour fast, it is **Secretory**.
Question 140: Which of the following statements regarding Plummer Vinson syndrome is NOT true?
- A. It is otherwise known as Patterson-Brown-Kelly disease.
- B. Iron deficiency anemia is probably the basic cause.
- C. It occurs exclusively in men. (Correct Answer)
- D. Achlorhydria is usually present.
Explanation: Plummer-Vinson Syndrome (PVS), also known as **Paterson-Brown-Kelly Syndrome**, is characterized by a classic triad of **iron deficiency anemia (IDA), dysphagia, and esophageal webs**. [1] **Why Option C is the correct answer (False statement):** Plummer-Vinson Syndrome does **not** occur exclusively in men. In fact, it is classically seen in **middle-aged women** (typically in their 4th to 7th decades). The higher prevalence in females is attributed to the increased physiological demand for iron due to menstruation and pregnancy. [1] **Analysis of other options:** * **Option A:** It is indeed eponymously known as **Paterson-Brown-Kelly disease**, named after the British laryngologists who described it independently. * **Option B:** Iron deficiency is considered the primary etiological factor. [1] The depletion of iron-dependent enzymes leads to mucosal atrophy and the subsequent formation of esophageal webs. * **Option C:** **Achlorhydria** (absence of hydrochloric acid in gastric secretions) or hypochlorhydria is a common association, often linked to the generalized mucosal atrophy seen in these patients. **High-Yield Clinical Pearls for NEET-PG:** * **The Triad:** Iron deficiency anemia, Dysphagia (painless, for solids), and Esophageal webs (usually post-cricoid/upper esophagus). * **Physical Signs:** Glossitis (smooth red tongue), Koilonychia (spoon-shaped nails), and Cheilosis. * **Malignancy Risk:** It is a **premalignant condition**. Patients have an increased risk of developing **Squamous Cell Carcinoma** of the esophagus and pharynx. * **Treatment:** Iron supplementation often resolves the dysphagia; however, mechanical dilation may be required for persistent webs.
Practice by Chapter
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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