Gastroenterology Practice Questions

Q: Which of the following electrolyte disturbances is commonly observed in patients with cirrhosis?

Hypervolemic hyponatremia. **Explanation:** In patients with cirrhosis, the primary driver of electrolyte imbalance is **portal hypertension**, which leads to splanchnic vasodilation. This causes a decrease in effective arterial blood volume, triggering the activation of the Renin-Angiotensin-Aldosterone System (RAAS) and the non-osmotic release of Antidiuretic Hormone (ADH/Vasopressin). ADH leads to free water retention that exceeds sodium retention, resulting in **Hypervolemic Hyponatremia** (dilutional hyponatremia) [1]. Despite having an excess of total body sodium and water (manifesting as edema and ascites), the "effective" circulating volume is low [2]. **Analysis of Options:** * **Option A (Hypovolemic hyponatremia):** This occurs due to fluid loss (e.g., excessive diuretic use or diarrhea). While it can occur in cirrhotics, the *classic* pathophysiology of the disease state itself is hypervolemic [1]. * **Option B (Euvolemic hyponatremia):** Typically seen in SIADH, hypothyroidism, or adrenal insufficiency [1]. In cirrhosis, patients are clinically fluid-overloaded (hypervolemic), not euvolemic. * **Option D (Euvolemic hypernatremia):** Usually seen in Diabetes Insipidus. Cirrhosis is characterized by water retention, not water loss. **High-Yield Clinical Pearls for NEET-PG:** * **Sodium Paradox:** In cirrhosis, there is **high total body sodium** but **low serum sodium** due to disproportionate water retention [1]. * **Prognostic Marker:** The severity of hyponatremia in cirrhosis is a strong independent predictor of mortality and is used in the **MELD-Na score**. * **Management:** Treatment involves fluid restriction and, in refractory cases, Vasopressin receptor antagonists (Vaptans). Avoid rapid correction to prevent **Osmotic Demyelination Syndrome**.

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: 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).

Question 1

Which of the following electrolyte disturbances is commonly observed in patients with cirrhosis?

Accepted Answer

Hypervolemic hyponatremia

Answer

Hypovolemic hyponatremia

Answer

Euvolemic hyponatremia

Answer

Euvolemic hypernatremia

Question 2

Peptic ulcer disease is associated with all the following conditions except one?

Accepted Answer

Pernicious anemia

Answer

Cirrhosis

Answer

Zollinger-Ellison syndrome

Answer

Primary hyperparathyroidism

Question 3

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 4

Risk of malignancy in ulcerative colitis is more with which of the following factors?

Accepted Answer

Pseudopolyps

Answer

Onset in childhood

Answer

Extensive involvement of the colon

Answer

Disrupted architecture with crypt abscesses

Question 5

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 6

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 7

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 8

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 9

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 10

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

Gastroenterology — MCQs

Gastroenterology — MCQs

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