Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 711: What is the "string sign" of Kantor seen in?

A. Ulcerative colitis
B. Crohn's disease (Correct Answer)
C. Cholecystitis
D. Appendicitis

Explanation: The **"String sign of Kantor"** is a classic radiological finding seen on a barium meal follow-through (BMFT) in patients with **Crohn’s disease** [1]. It represents a thin, string-like appearance of the barium column in the terminal ileum [1]. This occurs due to severe narrowing of the intestinal lumen caused by transmural inflammation, thickening of the bowel wall, and intense spasms . **Why the other options are incorrect:** * **Ulcerative colitis:** This condition typically involves the colon and rectum (sparing the small intestine). The characteristic radiological finding is the **"Lead pipe appearance"** (loss of haustrations) due to chronic inflammation and fibrosis. * **Cholecystitis:** This is inflammation of the gallbladder, usually diagnosed via ultrasound (showing wall thickening or pericholecystic fluid) or HIDA scan, not by signs of intestinal luminal narrowing. * **Appendicitis:** While it can cause ileal irritation, it is primarily diagnosed clinically or via CT/Ultrasound. A specific radiological sign associated with it is the "inverted 3 sign" or "cecal bar," but not the string sign. **High-Yield Clinical Pearls for NEET-PG:** * **Kantor’s String Sign:** Terminal ileum narrowing in Crohn’s [1]. * **Stierlin’s Sign:** Rapid emptying of the cecum due to irritability (seen in Ileocecal TB and Crohn's). * **Cobblestone Appearance:** Seen on endoscopy in Crohn's due to deep longitudinal ulcers and intervening normal mucosa. * **Creeping Fat:** Mesenteric fat wrapping around the bowel, pathognomonic for Crohn’s disease. * **Skip Lesions:** Discontinuous areas of involvement, a hallmark of Crohn's .

Question 712: A patient with antral carcinoma repeatedly vomits. Which of the following is NOT typically seen?

A. Acidosis (Correct Answer)
B. Hypokalemia
C. Hyponatremia
D. Hypochloremia

Explanation: **Explanation:** Antral carcinoma causing gastric outlet obstruction (GOO) leads to repeated vomiting of gastric contents. The characteristic metabolic derangement in this scenario is **Metabolic Alkalosis**, not acidosis. **1. Why Acidosis is the Correct Answer (The "NOT" seen feature):** Gastric juice is rich in hydrochloric acid (HCl). Repeated vomiting results in a massive loss of hydrogen ions ($H^+$). To compensate, the body shifts towards an alkaline state, leading to **Metabolic Alkalosis** (specifically, hypochloremic hypokalemic metabolic alkalosis). Therefore, acidosis is not typically seen. **2. Why the other options are wrong (Features that ARE seen):** * **Hypochloremia (D):** Gastric juice contains high concentrations of chloride ($Cl^-$). Vomiting leads to direct depletion of chloride, which is the primary driver of the alkalosis. * **Hyponatremia (C):** Sodium is lost both in the vomitus and through the kidneys. As the body becomes dehydrated, ADH is secreted, which retains water and further dilutes serum sodium. * **Hypokalemia (B):** This occurs due to three reasons: direct loss in vomitus, renal loss (as the kidney exchanges $K^+$ for $H^+$ to conserve acid), and the "aldosterone effect" triggered by volume depletion. **Clinical Pearls for NEET-PG:** * **Paradoxical Aciduria:** In severe GOO, despite systemic alkalosis, the urine becomes acidic. This happens because the kidney, faced with severe volume depletion, prioritizes sodium reabsorption in exchange for $H^+$ ions (via the $Na^+/H^+$ pump) once $K^+$ stores are exhausted. * **Treatment of Choice:** The initial management for this metabolic state is **0.9% Normal Saline** (to correct volume and chloride) with **Potassium supplementation**. * **Classic Triad:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria.

Question 713: Chronic pancreatitis is seen in all the following conditions EXCEPT:

A. Chronic renal failure
B. Intraductal mucinous carcinoma
C. Alcohol
D. None of the above (Correct Answer)

Explanation: **Explanation:** Chronic pancreatitis (CP) is a progressive inflammatory disorder characterized by irreversible destruction of pancreatic parenchyma and its replacement by fibrosis. The correct answer is **"None of the above"** because all three listed conditions (A, B, and C) are recognized etiologies or associations of chronic pancreatitis. 1. **Alcohol (Option C):** This is the most common cause of chronic pancreatitis worldwide (70–80% of cases). Chronic ethanol consumption leads to the secretion of protein-rich pancreatic juice, which forms "protein plugs" that calcify and obstruct the ducts, leading to acinar cell injury. 2. **Intraductal Papillary Mucinous Neoplasm/Carcinoma (Option B):** These tumors produce thick, viscous mucin that causes mechanical obstruction of the main pancreatic duct or its branches. This "upstream" obstruction leads to chronic obstructive pancreatitis, characterized by ductal dilation and parenchymal atrophy. 3. **Chronic Renal Failure (Option A):** Patients with end-stage renal disease (ESRD) have a significantly higher incidence of chronic pancreatitis. The pathophysiology involves secondary hyperparathyroidism (leading to hypercalcemia, which activates trypsinogen) and the accumulation of uremic toxins that cause direct pancreatic ductal damage. **High-Yield Clinical Pearls for NEET-PG:** * **TIGAR-O Classification:** A useful mnemonic for CP etiologies: **T**oxic-metabolic (Alcohol, Hypercalcemia, Hyperlipidemia), **I**diopathic, **G**enetic (SPINK1, CFTR, PRSS1 mutations), **A**utoimmune, **R**ecurrent/Severe acute pancreatitis, and **O**bstructive. * **Classic Triad:** Pancreatic calcifications (most specific), steatorrhea, and diabetes mellitus (seen in advanced stages). * **Investigation of Choice:** **MRCP** is the gold standard for visualizing ductal changes (Chain of Lakes appearance). **CT scan** is best for detecting calcifications. * **Tropical Pancreatitis:** A specific form of CP seen in young adults in developing countries (e.g., Kerala, India), often associated with large ductal calculi and early-onset diabetes (Cassava consumption was previously implicated but is now debated).

Question 714: Which of the following is NOT a cause of acute pancreatitis?

A. Hypercalcemia (Correct Answer)
B. Increased amylase level
C. Subcutaneous fat necrosis
D. Hyperlipidemia

Explanation: **Explanation:** The question asks to identify which option is **NOT** a cause of acute pancreatitis. While **Hypercalcemia (Option A)** is a well-known *cause* of acute pancreatitis, the structure of this specific question (often seen in recall exams) implies a distinction between **etiological factors** and **clinical features/complications**. However, based on standard medical logic, Hypercalcemia, Hyperlipidemia, and certain drugs are causes, while increased amylase and fat necrosis are consequences. *Note: In many standardized formats, if "Hypercalcemia" is marked as the "correct" answer to "which is NOT a cause," it usually indicates a typographical error in the question stem or a specific focus on clinical manifestations vs. etiology.* **1. Why Hypercalcemia is a Cause:** Hypercalcemia (e.g., due to hyperparathyroidism) leads to the activation of trypsinogen to trypsin within the pancreatic parenchyma and can cause secretory precipitation in the pancreatic ducts, triggering acute inflammation. **2. Analysis of Other Options:** * **Hyperlipidemia (Option D):** Specifically, Hypertriglyceridemia (typically >1000 mg/dL), is a proven **cause** of acute pancreatitis due to the release of free fatty acids by pancreatic lipase, which damages the endothelium and acinar cells. * **Increased Amylase Level (Option B):** This is a **biochemical marker** used for diagnosis, not a cause. Serum amylase rises within 6–12 hours of onset. * **Subcutaneous Fat Necrosis (Option C):** This is a **clinical manifestation** (part of the "Pancreatic Panniculitis" triad) resulting from the systemic release of pancreatic enzymes (lipase) into the circulation. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cause:** Gallstones (1st), Alcohol (2nd). * **Iatrogenic Cause:** Post-ERCP pancreatitis. * **Drug-induced:** Azathioprine, Sulfonamides, Valproate, Estrogens, and Thiazides. * **Scoring Systems:** Ranson’s Criteria, APACHE II, and BISAP are used to predict severity. * **Diagnostic Hallmark:** Lipase is more specific and remains elevated longer than Amylase.

Question 715: All of the following statements about primary sclerosing cholangitis are true, EXCEPT:

A. Increased risk associated with smoking (Correct Answer)
B. Associated with Ulcerative colitis
C. GGT elevation occurs early
D. Pruiritis is a common presenting symptom

Explanation: Explanation: Primary Sclerosing Cholangitis (PSC) is a chronic cholestatic liver disease characterized by inflammation and obliterative fibrosis of the intrahepatic and extrahepatic bile ducts, leading to a "beaded" appearance on imaging. **Why Option A is the Correct Answer (The Exception):** Unlike many other inflammatory conditions, **smoking is actually associated with a decreased risk** of developing Primary Sclerosing Cholangitis. This "protective" effect of smoking is also famously observed in Ulcerative Colitis (UC). Therefore, the statement that there is an *increased* risk associated with smoking is false. **Analysis of Other Options:** * **Option B:** Approximately 70-80% of patients with PSC have concomitant **Ulcerative Colitis** [1]. This association is a classic high-yield fact; however, only about 4-5% of UC patients develop PSC. [1] * **Option C:** PSC is a cholestatic disorder. **GGT and Alkaline Phosphatase (ALP)** elevations are typically the earliest biochemical markers, often rising significantly before bilirubin levels increase [1]. * **Option D:** The clinical presentation is often insidious. **Pruritus and fatigue** are the most common presenting symptoms, followed by jaundice as the disease progresses [1]. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** MRCP (shows "beaded appearance" or multifocal strictures). * **Antibody Marker:** **p-ANCA** is positive in about 60-80% of cases (though not specific) [1]. * **Biopsy Finding:** "Onion-skin" fibrosis (periductal concentric fibrosis). * **Malignancy Risk:** Significantly increased risk of **Cholangiocarcinoma** and Colorectal Cancer. * **Treatment:** Liver transplantation is the only definitive cure for end-stage disease.

Question 716: In acute pancreatitis, which of the following findings is NOT typically observed?

A. Raised amylase
B. Hypercalcemia (Correct Answer)
C. Hypocalcemia
D. Increased serum lipase

Explanation: In acute pancreatitis, the hallmark biochemical findings involve the elevation of pancreatic enzymes and specific electrolyte disturbances. ### **Why Hypercalcemia is the Correct Answer** **Hypercalcemia** is not a finding *caused* by acute pancreatitis; rather, it is a potential **etiology** (cause) of the condition [1]. In the setting of established acute pancreatitis, the body typically experiences **Hypocalcemia** (Option C). This occurs due to **saponification**: activated lipases break down peripancreatic fat into free fatty acids, which then bind (chelate) calcium ions to form "calcium soaps" in the retroperitoneum [1]. ### **Analysis of Other Options** * **Raised Amylase (Option A):** Serum amylase rises within 6–12 hours of onset. While sensitive, it is less specific than lipase and may return to normal within 3–5 days despite ongoing inflammation. * **Increased Serum Lipase (Option D):** Lipase is the **preferred biochemical marker** for diagnosis. It rises earlier, stays elevated longer (8–14 days), and is more specific to the pancreas than amylase. * **Hypocalcemia (Option C):** As explained above, this is a common finding and is a component of the **Ranson Criteria** and **Modified Glasgow Score**, where a significant drop in calcium indicates severe disease and a poor prognosis [1]. ### **NEET-PG High-Yield Pearls** * **Diagnosis:** Requires 2 out of 3: (1) Characteristic abdominal pain, (2) Serum amylase/lipase >3x upper limit of normal, (3) Characteristic findings on imaging (CECT is the gold standard but not usually needed in the first 48 hours) [1]. * **Most Common Cause:** Gallstones (Worldwide/India), followed by Alcohol. * **Sentinel Loop:** A localized ileus of the jejunum seen on X-ray. * **Cullen’s Sign:** Periumbilical ecchymosis indicating hemoperitoneum (severe necrotizing pancreatitis).

Question 717: Which of the following statements regarding peptic ulcer disease is true?

A. Anterior ulcers bleed more commonly than posterior ulcers.
B. Posteriorly perforated ulcers always require conservative management.
C. Anti-Helicobacter pylori drugs must always be included in the treatment regimen for peptic ulcer disease.
D. Helicobacter pylori infection is known to increase the incidence of gastric ulcers. (Correct Answer)

Explanation: Peptic ulcer disease (PUD) is a chronic inflammatory condition characterized by the erosion of the gastric or duodenal mucosa. **Helicobacter pylori** is the most significant risk factor for peptic ulcer disease (PUD), causing chronic inflammation of the gastric mucosa by increasing gastrin release and subsequent acid production [1]. While *H. pylori* is more strongly associated with duodenal ulcers (approx. 90%), it is also a major cause of gastric ulcers (approx. 70%) [1]. Eradication of the bacteria significantly reduces the recurrence rate of these ulcers. Posterior ulcers are more likely to bleed because they can erode into the gastroduodenal artery, whereas anterior ulcers are more likely to perforate. Perforated ulcers are surgical emergencies. While *H. pylori* is a common cause, treatment must be tailored to the etiology, especially in the case of NSAID-induced ulcers. For diagnosis, non-invasive methods like the Urea Breath Test or faecal antigen tests are preferred for their high sensitivity and specificity [2]. *H. pylori* eradication remains the cornerstone of therapy for peptic ulcers to induce healing and prevent recurrence [2].

Question 718: Pseudoachalasia is associated with all of the following conditions EXCEPT?

A. Esophageal tumor
B. Paraneoplastic syndrome
C. Carcinoma of the gastric fundus
D. Rosary esophagus (Correct Answer)

Explanation: **Explanation:** **Pseudoachalasia** (also known as secondary achalasia) is a clinical condition that mimics the clinical, manometric, and radiographic features of primary achalasia (e.g., failure of LES relaxation and aperistalsis) [1]. However, unlike primary achalasia, which is idiopathic, pseudoachalasia is caused by an underlying secondary process—most commonly a malignancy [2]. **Why "Rosary Esophagus" is the correct answer:** **Rosary esophagus** (or "corkscrew esophagus") is the classic radiographic finding on a barium swallow for **Diffuse Esophageal Spasm (DES)** [1]. DES is a primary motility disorder characterized by high-amplitude, non-peristaltic contractions. It is a distinct entity and is not a cause or feature of pseudoachalasia. **Analysis of incorrect options:** * **Esophageal tumor & Carcinoma of the gastric fundus:** These are the most common causes of pseudoachalasia. Malignant infiltration of the esophageal wall or the myenteric (Auerbach’s) plexus at the gastroesophageal junction leads to mechanical obstruction and impaired relaxation of the LES [2]. * **Paraneoplastic syndrome:** Certain malignancies (notably small cell lung cancer) can cause pseudoachalasia via a paraneoplastic mechanism, where antibodies (like anti-Hu) attack the esophageal neurons, mimicking the idiopathic disease [2]. **Clinical Pearls for NEET-PG:** * **Red Flags for Pseudoachalasia:** Age >60 years, rapid weight loss, and short duration of symptoms (<6 months). Primary achalasia usually presents in younger patients with a more chronic course. * **Diagnostic Clue:** If an endoscope cannot pass through the LES easily ("pop" sensation), it suggests primary achalasia; if there is a fixed, rigid narrowing, suspect pseudoachalasia (malignancy) [2]. * **Chagas Disease:** Caused by *Trypanosoma cruzi*, this is another cause of secondary achalasia (common in South America).

Question 719: Which of the following statements regarding the management of ileocecal Crohn's disease is true?

A. Antibiotics should be avoided.
B. Steroids should be avoided in the first week.
C. 5-ASA agents can reduce the risk of small bowel obstruction. (Correct Answer)
D. Cholestyramine improves diarrhea but worsens steatorrhea.

Explanation: In ileocecal Crohn’s disease, chronic transmural inflammation leads to fibrotic changes and stricture formation. 5-Aminosalicylic acid (5-ASA) agents, such as Mesalamine, exert a local anti-inflammatory effect on the intestinal mucosa. By maintaining remission and suppressing chronic inflammation, these agents help prevent the progression of strictures, thereby reducing the long-term risk of recurrent small bowel obstructions. [1] **Analysis of Incorrect Options:** * **A. Antibiotics should be avoided:** This is incorrect. Antibiotics (e.g., Metronidazole and Ciprofloxacin) are frequently used in Crohn’s disease to treat complications like perianal disease, fistulas, and small intestinal bacterial overgrowth (SIBO). * **B. Steroids should be avoided in the first week:** This is incorrect. Corticosteroids are the mainstay for inducing remission in acute flares of Crohn’s disease and are typically started immediately to control systemic inflammation. [2] * **D. Cholestyramine improves diarrhea but worsens steatorrhea:** While Cholestyramine (a bile acid sequestrant) is used to treat bile acid diarrhea following terminal ileal resection, it does not typically "worsen" steatorrhea in a clinically significant way compared to the benefit it provides for diarrhea; however, the primary management focus in active ileocecal disease remains anti-inflammatory therapy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** The terminal ileum (ileocecal region) is the most common site involved in Crohn’s disease. [1] * **Skip Lesions:** Crohn’s is characterized by "skip lesions" and transmural inflammation, unlike the continuous mucosal involvement in Ulcerative Colitis. * **Management Hierarchy:** 5-ASAs are used for mild disease; Steroids/Budesonide for induction; Azathioprine/Infliximab for maintenance in moderate-to-severe cases. [2] * **Smoking:** It is a major risk factor for Crohn’s disease (increases flares), whereas it may be protective in Ulcerative Colitis.

Question 720: Duodenal ulcer is most commonly caused by:

A. GERD
B. NSAID therapy
C. Stress ulcer
D. H. pylori (Correct Answer)

Explanation: **Explanation:** The primary cause of Peptic Ulcer Disease (PUD), specifically duodenal ulcers, is infection with **Helicobacter pylori** [1]. 1. **Why H. pylori is correct:** *H. pylori* is a gram-negative, microaerophilic bacterium that colonizes the gastric antrum. It causes hypergastrinemia and increased acid secretion, which leads to gastric metaplasia in the duodenum [1]. This allows the bacteria to colonize the duodenum, causing mucosal inflammation and ulceration. In India and globally, *H. pylori* is responsible for approximately **90-95% of duodenal ulcers** and 70-80% of gastric ulcers. 2. **Why other options are incorrect:** * **NSAID therapy:** This is the second most common cause of PUD [2]. While NSAIDs are a major cause of gastric ulcers (by inhibiting COX-1 and prostaglandin synthesis), they are less frequently the primary cause of duodenal ulcers compared to *H. pylori*. * **Stress ulcer:** These occur in the setting of severe physiological stress (e.g., burns—Curling’s ulcer, or CNS trauma—Cushing’s ulcer) [3]. They are acute erosions rather than the chronic pathology seen in typical duodenal ulcers. * **GERD:** Gastroesophageal Reflux Disease involves the reflux of acid into the esophagus. While it shares the pathophysiology of acid-related damage, it causes esophagitis or esophageal ulcers, not duodenal ulcers. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** The first part of the duodenum (D1) is the most common site for PUD. * **Pain pattern:** Duodenal ulcer pain typically occurs 2-3 hours after meals and is **relieved by food** (unlike gastric ulcers, where pain is aggravated by food). * **Investigation of choice:** Upper GI Endoscopy (UGIE). * **Non-invasive Gold Standard for H. pylori:** Urea Breath Test (used for diagnosis and confirming eradication). * **Zollinger-Ellison Syndrome:** Suspect this if ulcers are multiple, refractory, or located in the distal duodenum/jejunum.

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)

Practice Questions

Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

Practice Questions

Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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