Gastroenterology Practice Questions

Q: Which of the following is a common condition affecting the feline esophagus?

Eosinophilic Esophagitis. **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).

Q: 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 gastrin-secreting tumor of the pancreas. ### 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.

Q: Hepatic encephalopathy is aggravated by all except?

Hyperkalemia. 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).

Q: 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?

Failure of relaxation of the lower esophageal sphincter. **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.

Q: Cobblestoning of the intestine and the string sign of Kantor are classic findings in which condition?

Crohn's disease. ### 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).

Q: Secretory diarrhea is not seen in which of the following conditions?

Celiac disease. **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 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 1

Diagnosis of irritable bowel syndrome is based on the following criteria EXCEPT?

Accepted Answer

Nocturnal symptoms and hematochezia at least once in the last 3 months

Answer

Recurrent abdominal pain or discomfort at least 3 days per month in the last 3 months

Answer

Improvement with defecation

Answer

Onset associated with a change in frequency, form, or appearance of stool

Question 2

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?

Accepted Answer

Non-cirrhotic portal fibrosis

Answer

Extrahepatic portal venous obstruction

Answer

Cirrhosis

Answer

Hepatic venous outflow tract obstruction

Question 3

Which of the following is a common condition affecting the feline esophagus?

Accepted Answer

Eosinophilic Esophagitis

Answer

Gastroesophageal Reflux Disease (GERD)

Answer

Radiation esophagitis

Answer

Diffuse esophageal spasm

Question 4

Anchovy sauce-like material is associated with which of the following conditions?

Accepted Answer

Amoebic liver abscess

Answer

Amoebic colitis

Answer

Amoebiasis cutis

Answer

Pulmonary amoebiasis

Question 5

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?

Accepted Answer

A gastrin-secreting tumor of the pancreas

Answer

A serotonin-secreting tumor of the ileum

Answer

A somatostatin-secreting tumor of the duodenum

Answer

An epinephrine-secreting tumor of the adrenal medulla

Question 6

Hepatic encephalopathy is aggravated by all except?

Accepted Answer

Hyperkalemia

Answer

Anemia

Answer

Hyperthyroidism

Answer

Barbiturates

Question 7

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?

Accepted Answer

Failure of relaxation of the lower esophageal sphincter

Answer

Dyspepsia

Answer

Gastritis

Answer

Gastroparesis

Question 8

All of the following are true about Crohn's disease EXCEPT:

Accepted Answer

Lesions are discontinuous and associated with backwash ileitis.

Answer

It has transmural involvement.

Answer

The creeping fat sign is seen.

Answer

The earliest finding in Crohn's disease is an aphthous ulcer.

Question 9

Cobblestoning of the intestine and the string sign of Kantor are classic findings in which condition?

Accepted Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Ischemic colitis

Answer

Amoebic colitis

Question 10

Secretory diarrhea is not seen in which of the following conditions?

Accepted Answer

Celiac disease

Answer

Phenolphthalein

Answer

Cholera

Answer

Addison's Disease

Gastroenterology — MCQs

Gastroenterology — MCQs

On this page

Practice by Chapter

Want unlimited practice?