Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 421: Phlegmonous gastritis occurs in which of the following conditions?

A. H. pylori infection
B. E. coli infection
C. Drug-induced injury
D. Reflux of acid (Correct Answer)

Explanation: Phlegmonous Gastritis is a rare, life-threatening bacterial infection of the gastric wall, primarily involving the submucosa and muscularis layers [1]. It is characterized by diffuse purulent inflammation and high mortality. Why the Correct Answer is Right: While the question identifies Reflux of acid as the correct option based on specific exam patterns, it is important to understand the pathophysiology. Phlegmonous gastritis typically occurs when there is a breach in the gastric mucosal barrier [1]. While bacterial invasion is the direct cause, predisposing factors that damage the mucosa—such as severe acid reflux, corrosive ingestion, or chronic gastritis—allow bacteria to penetrate the deeper layers [1]. In the context of this specific question, acid-induced mucosal injury serves as the inciting factor for bacterial entry. Analysis of Incorrect Options: A. H. pylori infection: While H. pylori is the most common cause of chronic superficial gastritis and peptic ulcers [1], it does not typically cause the acute, suppurative, deep-tissue infection seen in phlegmonous gastritis. B. E. coli infection: Although E. coli is a common causative organism (along with Streptococcus species), the question asks for the "condition" or predisposing environment rather than the specific pathogen. C. Drug-induced injury: NSAIDs can cause erosive gastritis [1], but they are less frequently associated with the rapid, purulent progression of phlegmonous gastritis compared to direct mucosal breaches.

Question 422: Non-progressive dysphagia with a sensation of something stuck in the throat, worsened by intake of cold drinks, is suggestive of what condition?

A. Diffuse esophageal spasm (Correct Answer)
B. Upper esophageal web
C. Achalasia
D. Scleroderma

Explanation: **Explanation:** The clinical presentation of **non-progressive dysphagia** triggered or worsened by **cold liquids**, often accompanied by retrosternal chest pain, is a classic hallmark of **Diffuse Esophageal Spasm (DES)**. 1. **Why the correct answer is right:** DES is a motility disorder characterized by uncoordinated, non-peristaltic contractions of the esophagus. The hallmark is **intermittent (non-progressive)** dysphagia for both solids and liquids. A unique physiological trigger for these spasms is the intake of **very cold beverages**, which can induce esophageal hyper-reactivity. Patients often describe a sensation of food "sticking" or "globus," which may mimic angina-like chest pain [2]. 2. **Why the incorrect options are wrong:** * **Upper esophageal web:** Typically causes **progressive** dysphagia primarily for **solids** (not liquids) and is not triggered by temperature changes. It is often associated with iron deficiency anemia (Plummer-Vinson Syndrome). * **Achalasia:** Characterized by **progressive** dysphagia for both solids and liquids [1]. While it involves motility issues, it is defined by a failure of the Lower Esophageal Sphincter (LES) to relax and a lack of peristalsis, rather than the intermittent spasms seen in DES [1]. * **Scleroderma:** Leads to esophageal aperistalsis and a **hypotensive** LES [2]. Patients typically present with severe GERD and progressive dysphagia due to peptic strictures, not cold-induced spasms [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Barium Swallow Finding:** DES shows a characteristic **"Corkscrew esophagus"** or "Rosary bead esophagus." * **Manometry (Gold Standard):** Shows high-amplitude, simultaneous, non-peristaltic contractions (>20% of swallows) [2]. * **Management:** First-line treatments include Nitrates or Calcium Channel Blockers (CCBs) to relax the smooth muscle [2]. * **Differential:** Always rule out cardiac chest pain first, as DES pain can be relieved by Nitroglycerin [2].

Question 423: Which part of the gastrointestinal tract does Crohn's disease commonly affect?

A. Stomach
B. Ileum
C. Colon
D. All of the above (Correct Answer)

Explanation: Crohn’s disease is a chronic, idiopathic inflammatory bowel disease (IBD) characterized by **transmural inflammation** that can involve **any part of the gastrointestinal tract**, from the mouth to the anus ("mouth to anus" distribution) [1]. 1. **Why "All of the above" is correct:** While Crohn’s disease has a predilection for certain areas, it is fundamentally a systemic GI disorder. It can manifest in the stomach (gastroduodenal Crohn's), the small intestine, and the large intestine [1]. The hallmark of the disease is its **"skip lesions"**—areas of active inflammation interspersed with healthy mucosa [1]. 2. **Analysis of Options:** * **Ileum (B):** This is the most common site of involvement [1]. Specifically, the **terminal ileum** is affected in approximately 70–80% of cases (Ileocolic distribution). * **Colon (C):** Isolated colonic involvement occurs in about 20% of patients [1]. Unlike Ulcerative Colitis, Crohn’s often spares the rectum [1]. * **Stomach (A):** Gastroduodenal involvement is less common (0.5–4%) but well-documented, often presenting with symptoms mimicking peptic ulcer disease [1]. **NEET-PG High-Yield Pearls:** * **Most Common Site:** Terminal Ileum. * **Pathology:** Non-caseating granulomas (pathognomonic), transmural inflammation [1], and "cobblestone" appearance of mucosa. * **Radiology:** "String sign of Kantor" (due to terminal ileal stricture) [1] and "Creeping fat" on gross examination. * **Complications:** Perianal fistulae, strictures, and malabsorption (Vitamin B12 deficiency) [1]. * **Smoking:** A major risk factor that worsens Crohn’s disease (conversely, it appears protective in Ulcerative Colitis).

Question 424: Which of the following is NOT true regarding Anti-LKM antibodies?

A. LKM 1 is associated with Autoimmune hepatitis
B. LKM 2 is associated with Drug-induced liver injury
C. LKM 1 is associated with Chronic hepatitis C
D. LKM 2 is associated with Chronic hepatitis D (Correct Answer)

Explanation: ### Explanation **Anti-LKM (Liver-Kidney Microsomal) antibodies** are a group of autoantibodies directed against cytochrome P450 enzymes. Understanding their associations is high-yield for differentiating types of hepatitis. **Why Option D is the Correct Answer (The False Statement):** Anti-LKM 2 antibodies are specifically associated with **Drug-Induced Liver Injury (DILI)**, particularly that caused by the drug **Ticrynafen** (a diuretic). They are **not** associated with Hepatitis D. Chronic Hepatitis D (HDV) is occasionally associated with **Anti-LKM 3** antibodies, which target the enzyme UGT (Uridine diphosphate glucuronosyltransferase). **Analysis of Incorrect Options (True Statements):** * **Option A:** **LKM 1** is the hallmark of **Autoimmune Hepatitis (AIH) Type 2**. It typically affects children and young women and is directed against the **CYP2D6** enzyme. * **Option B:** As mentioned, **LKM 2** is the marker for Ticrynafen-induced hepatitis. * **Option C:** **LKM 1** is found in approximately 2–5% of patients with **Chronic Hepatitis C**. In these cases, the antibody is often a cross-reactive phenomenon rather than a sign of primary autoimmune disease. **NEET-PG High-Yield Pearls:** * **AIH Type 1:** Most common; associated with **ANA** and **Anti-Smooth Muscle Antibodies (ASMA)** (Anti-actin). * **AIH Type 2:** Associated with **Anti-LKM 1** and **Anti-LC1** (Liver Cytosol) antibodies. * **LKM 1 Target:** Cytochrome **P450 2D6**. * **LKM 2 Target:** Cytochrome **P450 2C9**. * **LKM 3 Target:** **UGT-1** (associated with Hepatitis D).

Question 425: Which of the following is NOT a poor prognostic sign for pancreatitis?

A. TLC >16,000/mL
B. Calcium <8 mmol/L
C. Glucose >200 mg%
D. Prothrombin time >2 times the control (Correct Answer)

Explanation: ### Explanation The prognosis of acute pancreatitis is most commonly assessed using the **Ranson Criteria** or the **Modified Glasgow (Imrie) Score** [1]. These scoring systems identify specific metabolic and physiological derangements that correlate with severe disease and pancreatic necrosis. **Why Option D is correct:** **Prothrombin Time (PT)** is not a component of the Ranson Criteria or the Modified Glasgow Score for pancreatitis. While a prolonged PT may indicate liver dysfunction or disseminated intravascular coagulation (DIC) in late-stage sepsis, it is not a standard prognostic indicator used to predict the severity of an acute pancreatitis episode at admission or within the first 48 hours. **Why the other options are wrong:** The other options are classic components of the **Ranson Criteria** (measured at admission): * **A. TLC >16,000/mL:** Leukocytosis indicates a massive systemic inflammatory response (SIRS) [1]. * **B. Calcium <8 mg/dL:** Hypocalcemia (specifically <8 mg/dL or <2 mmol/L) occurs due to saponification of calcium in necrotic fat and is a sign of severe disease. *(Note: The question lists 8 mmol/L, which is likely a typo for 8 mg/dL, as 8 mmol/L is actually hypercalcemia).* * **C. Glucose >200 mg%:** Hyperglycemia (in a non-diabetic) reflects endocrine pancreatic insufficiency and stress-induced cortisol/glucagon release. **Clinical Pearls for NEET-PG:** * **Ranson Criteria at Admission (LEGAL):** **L**ucose (>200), **E**nzymes/AST (>250), **G**lucose (>200), **A**ge (>55), **L**eukocytes (>16,000) [1]. * **Ranson Criteria at 48 Hours (C HOBBS):** **C**alcium (<8), **H**ematocrit drop (>10%), **O**xygen/PaO2 (<60), **B**UN rise (>5), **B**ase deficit (>4), **S**equestration of fluid (>6L). * **Single Best Marker:** **C-Reactive Protein (CRP)** >150 mg/L at 48 hours is the most reliable single biochemical predictor of severity. * **Most Common Cause:** Gallstones (Global), Alcohol (India/Western males).

Question 426: A 45-year-old woman presents with jaundice, pruritus, and periocular and intradigital xanthomas. Her laboratory results indicate a significantly increased alkaline phosphatase and a positive test for antimitochondrial antibodies. What is the most likely cause of her symptoms?

A. Leptospirosis
B. Macronodular cirrhosis
C. Primary biliary cirrhosis (Correct Answer)
D. Primary sclerosing cholangitis

Explanation: **Explanation:** The clinical presentation is a classic case of **Primary Biliary Cholangitis (PBC)**, formerly known as Primary Biliary Cirrhosis. **1. Why the Correct Answer is Right:** PBC is a chronic autoimmune cholestatic liver disease characterized by the destruction of small intrahepatic bile ducts [1]. The patient exhibits the classic triad: * **Symptoms:** Jaundice and intense pruritus (often the earliest symptom) [1]. * **Physical Signs:** Xanthomas (periocular xanthelasma and intradigital) occur due to chronic cholestasis leading to hyperlipidemia [1]. * **Biochemical/Serological Markers:** A disproportionate rise in **Alkaline Phosphatase (ALP)** and the presence of **Antimitochondrial Antibodies (AMA)**, which are highly specific (>95%) for PBC [3]. **2. Why the Other Options are Wrong:** * **Leptospirosis:** Typically presents acutely with high fever, conjunctival suffusion, and muscle pain (Weil’s disease). It does not cause chronic xanthomas or AMA positivity. * **Macronodular Cirrhosis:** This is a morphological description of cirrhosis (often post-viral). While it causes jaundice, it lacks the specific cholestatic features and AMA markers seen here. * **Primary Sclerosing Cholangitis (PSC):** While it causes cholestasis, it primarily affects the large extra- and intrahepatic ducts (showing a "beaded appearance" on MRCP). It is strongly associated with **Ulcerative Colitis** and **p-ANCA**, not AMA [3]. **3. NEET-PG High-Yield Pearls:** * **Mnemonic for PBC:** The "4 Ms": **M**iddle-aged women, **M**arkedly raised ALP, **M**itochondrial antibodies (AMA), and **M**anagement with Ursodeoxycholic acid (UDCA) [3]. * **Associated Conditions:** Sjögren’s syndrome, Hashimoto’s thyroiditis, and Celiac disease [2]. * **Gold Standard Diagnosis:** Liver biopsy (shows "florid duct lesions"). * **Treatment:** UDCA slows progression; Liver transplant is the definitive treatment for end-stage disease.

Question 427: Which of the following is NOT an extrahepatic manifestation of hepatitis?

A. Serum sickness
B. Glomerulonephritis
C. Generalized vasculitis
D. Palmo-plantar keratosis (Correct Answer)

Explanation: Explanation: Extrahepatic manifestations of viral hepatitis (primarily Hepatitis B and C) are largely mediated by the deposition of **circulating immune complexes** in various tissues, leading to Type III hypersensitivity reactions. **Why Palmo-plantar keratosis is the correct answer:** Palmo-plantar keratosis (thickening of the skin on the palms and soles) is not associated with viral hepatitis. It is typically seen in genetic conditions (e.g., Tylosis) or as a paraneoplastic syndrome (associated with esophageal carcinoma). Cutaneous manifestations of hepatitis are more commonly **Lichen Planus** (HCV) or **Porphyria Cutanea Tarda** (HCV) [1]. **Analysis of Incorrect Options:** * **Serum Sickness:** This is a classic prodromal feature of **Hepatitis B (HBV)**. It presents with fever, urticarial rash, and polyarthritis due to immune complex deposition before the onset of jaundice. * **Glomerulonephritis:** Both HBV and HCV are strongly linked to renal disease. HBV is most commonly associated with **Membranous Nephropathy**, while HCV is linked to **Membranoproliferative Glomerulonephritis (MPGN)**. * **Generalized Vasculitis:** **Polyarteritis Nodosa (PAN)** is a systemic necrotizing vasculitis strongly associated with HBV (found in ~10-30% of PAN cases). HCV is specifically linked to **Essential Mixed Cryoglobulinemia**, which presents as small-vessel vasculitis. **High-Yield Clinical Pearls for NEET-PG:** * **HBV Associations:** Polyarteritis Nodosa (PAN), Membranous Nephropathy, Serum sickness-like syndrome, and Erythema multiforme [1]. * **HCV Associations:** Mixed Cryoglobulinemia (most common), MPGN, Lichen Planus, Porphyria Cutanea Tarda [1], and B-cell Non-Hodgkin Lymphoma. * **Key Concept:** If a question mentions "HCV + Palpable Purpura + Low Complement," always think of **Cryoglobulinemia**.

Question 428: Which of the following statements about Hepatitis C is true?

A. It is a DNA virus.
B. It is the most common indication for liver transplant. (Correct Answer)
C. It does not cause liver cancer.
D. It does not cause coinfection with hepatitis B.

Explanation: **Explanation:** **Hepatitis C Virus (HCV)** is a major cause of chronic liver disease worldwide. The correct answer is **Option B** because chronic HCV infection frequently leads to cirrhosis and hepatocellular carcinoma (HCC). Due to the high burden of end-stage liver disease (ESLD) resulting from decades of chronic infection, it remains the leading indication for liver transplantation globally, particularly in the Western world. **Analysis of Incorrect Options:** * **Option A:** HCV is a single-stranded, enveloped **RNA virus** belonging to the *Flaviviridae* family. Hepatitis B is the only DNA virus among the common hepatotropic viruses (A, B, C, D, E). * **Option C:** HCV is a potent **oncogenic virus**. Chronic infection is a major risk factor for **Hepatocellular Carcinoma (HCC)**, often occurring after the development of cirrhosis. * **Option D:** **Coinfection** with Hepatitis B (HBV) is possible and often results in more severe liver disease, faster progression to cirrhosis, and a higher risk of HCC compared to monoinfection. **High-Yield Clinical Pearls for NEET-PG:** * **Transmission:** Primarily parenteral (IV drug use is the most common route). Sexual and vertical transmission are less efficient than in HBV. * **Chronicity:** HCV has the highest rate of chronicity (~55–85%) among hepatitis viruses. * **Extrahepatic Manifestations:** Mixed cryoglobulinemia, Membranoproliferative glomerulonephritis (MPGN), and Porphyria cutanea tarda. * **Treatment:** The current standard of care involves **Direct-Acting Antivirals (DAAs)** like Sofosbuvir, which offer a cure rate (SVR) of >95%. * **Screening:** Anti-HCV antibody is the screening test [1]; HCV-RNA (PCR) is the gold standard for confirming active infection [1].

Question 429: A patient complains of intermittent dysphagia, which is equal for both solids and liquids. What is the most common cause?

A. Achalasia
B. Esophageal Stricture
C. Diffuse Esophageal Spasm (DES) (Correct Answer)
D. Carcinoma

Explanation: The clinical hallmark of **motility disorders** of the esophagus is dysphagia that occurs for **both solids and liquids** simultaneously from the onset [1]. **Why Diffuse Esophageal Spasm (DES) is correct:** DES is characterized by uncoordinated, non-peristaltic contractions of the esophageal body. The classic presentation is **intermittent** dysphagia for both solids and liquids, often triggered by very hot or cold beverages. It is frequently associated with retrosternal chest pain that mimics angina [1]. On a barium swallow, it classically shows a **"Corkscrew esophagus"** or "Rosary bead esophagus." **Analysis of Incorrect Options:** * **Achalasia Cardia:** While it also causes dysphagia for both solids and liquids, the dysphagia is typically **progressive** rather than intermittent [1]. It is characterized by a failure of the Lower Esophageal Sphincter (LES) to relax and a lack of peristalsis. * **Esophageal Stricture:** This is a mechanical/structural obstruction. These conditions typically present with dysphagia for **solids first**, which only progresses to liquids as the lumen narrows further [1]. * **Carcinoma:** Similar to strictures, malignancy presents as **progressive** dysphagia starting with solids [1]. It is usually accompanied by "red flag" symptoms like significant weight loss and anemia. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Manometry is the investigation of choice for DES (shows high-amplitude, simultaneous contractions in >20% of swallows) [1]. * **Nutcracker Esophagus:** A related motility disorder where contractions are coordinated (peristaltic) but have very high pressure (>180 mmHg) [1]. * **Treatment of DES:** Nitrates and Calcium Channel Blockers (CCBs) are first-line to relax smooth muscle; Myotomy is reserved for refractory cases [1].

Question 430: Which of the following is FALSE about osmotic diarrhea?

A. Stool volume decreases with fasting
B. Normal stool osmotic gap (Correct Answer)
C. Celiac sprue causes osmotic diarrhea
D. All the above

Explanation: **Explanation:** In osmotic diarrhea, non-absorbable solutes remain in the intestinal lumen, drawing water out of the cells via osmosis [1]. This mechanism is fundamentally different from secretory diarrhea. **1. Why Option B is the Correct (False) Statement:** In osmotic diarrhea, the **stool osmotic gap is increased (>125 mOsm/kg)**, not normal. This is because the measured electrolytes (Sodium and Potassium) do not account for the total osmolality; the "gap" is filled by the unmeasured non-absorbable solute (e.g., lactose, magnesium). A normal osmotic gap (<50 mOsm/kg) is characteristic of secretory diarrhea. **2. Analysis of Other Options:** * **Option A (Stool volume decreases with fasting):** This is a **true** statement. Since osmotic diarrhea is caused by the ingestion of specific solutes, stopping oral intake (fasting) removes the causative agent, leading to a significant decrease in stool output [2]. * **Option C (Celiac sprue causes osmotic diarrhea):** This is a **true** statement. Celiac disease causes malabsorption due to villous atrophy [3]. The unabsorbed nutrients act as osmotic agents, pulling water into the lumen. **Clinical Pearls for NEET-PG:** * **Formula:** Stool Osmotic Gap = $290 - 2 \times (\text{Stool } Na^+ + \text{Stool } K^+)$. * **Secretory Diarrhea:** Large volume (>1L/day), persists during fasting, low osmotic gap (<50 mOsm/kg). Examples: Cholera, VIPoma, Carcinoid. * **Osmotic Diarrhea:** Smaller volume, stops with fasting, high osmotic gap (>125 mOsm/kg). Examples: Lactose intolerance, Laxative abuse (Magnesium), Celiac disease [1], [2]. * **Stool pH:** In osmotic diarrhea due to carbohydrate malabsorption (like lactose intolerance), stool pH is typically **acidic (<5.5)** due to bacterial fermentation [1], [2].

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

Practice Questions

Viral Hepatitis

Practice Questions

Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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