Gastroenterology — MCQs

A 35-year-old white man presents with diarrhea, weight loss, and right lower quadrant (RLQ) pain. On examination, a tender mass is noted in the RLQ; the fecal occult blood test is positive. Colonoscopy shows segmental areas of inflammation. Barium small bowel series shows nodular thickening of the terminal ileum. What is the most likely cause of lower gastrointestinal bleeding?

Q567Medium

Which of the following is NOT associated with peptic ulcer disease?

Q568Medium

What is true about Wilson's disease manifestations?

Q569Easy

Which of the following organisms is most commonly associated with breast abscess?

Q570Medium

Which of the following is TRUE regarding Crohn's disease?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 561: Acute pancreatitis causes all of the following except?

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

Explanation: In acute pancreatitis, **hypocalcemia** (low calcium) is a classic finding, not hypercalcemia. This occurs due to a process called **saponification**: pancreatic lipases break down peripancreatic fat into free fatty acids, which then bind with circulating calcium ions to form "calcium soaps." This sequestration leads to a drop in serum calcium levels. Notably, a serum calcium level of <7 mg/dL is a poor prognostic sign (included in Ranson’s Criteria). [1] **Analysis of other options:** * **Increased amylase level:** Serum amylase typically rises within 2–12 hours of onset. While sensitive, it is less specific than lipase and may return to normal within 3–5 days even if inflammation persists. * **Subcutaneous fat necrosis:** This is a rare but recognized extra-pancreatic manifestation (often presenting as tender, erythematous nodules on the shins), caused by the systemic release of pancreatic enzymes into the circulation. [1] * **Hyperlipidemia:** Hypertriglyceridemia (typically >1000 mg/dL) is both a **cause** and a potential **consequence** of acute pancreatitis. Elevated chylomicrons can interfere with amylase assays, sometimes leading to falsely "normal" amylase levels. **High-Yield Pearls for NEET-PG:** * **Most specific enzyme:** Serum Lipase (remains elevated longer than amylase). * **Most common cause:** Gallstones (followed by Alcohol). * **Cullen’s sign:** Periumbilical ecchymosis indicating hemoperitoneum. * **Grey Turner’s sign:** Flank ecchymosis indicating retroperitoneal hemorrhage. * **Drug-induced causes:** Azathioprine, Sulfonamides, Valproate, and Thiazides. * **Imaging:** Contrast-Enhanced CT (CECT) is the gold standard for assessing necrosis (usually done after 48–72 hours). [1]

Question 562: Portal hypertension following portal vein thrombosis is guided by all except?

A. Increase in splenic pulp pressure
B. Increase in portal vein pressure
C. Increase in hepatic vein pressure (Correct Answer)
D. Portal vein Doppler study

Explanation: Explanation: Portal hypertension is classified based on the site of resistance to blood flow relative to the hepatic sinusoids: **Pre-hepatic, Intra-hepatic, or Post-hepatic.** **1. Why "Increase in hepatic vein pressure" is the correct answer:** Portal vein thrombosis (PVT) is a classic **Pre-hepatic** cause of portal hypertension. In this condition, the obstruction occurs *before* the blood reaches the liver [1]. Since the pathology is proximal to the hepatic sinusoids and the hepatic veins, the **Hepatic Venous Pressure Gradient (HVPG)** and the pressure within the hepatic veins themselves remain **normal** [2]. An increase in hepatic vein pressure would instead indicate a post-hepatic cause, such as Budd-Chiari Syndrome or Congestive Heart Failure [3]. **2. Analysis of Incorrect Options:** * **A. Increase in splenic pulp pressure:** In portal hypertension (regardless of the cause), back-pressure leads to congestion of the spleen. Splenic pulp pressure is a direct reflection of portal venous pressure and will be elevated in PVT. * **B. Increase in portal vein pressure:** By definition, portal hypertension involves an increase in the pressure of the portal venous system (normal is 5–10 mmHg). In PVT, the pressure rises upstream from the site of the thrombus [2]. * **D. Portal vein Doppler study:** This is the initial diagnostic modality of choice [1]. It can visualize the thrombus, show absent or reversed (hepatofugal) flow, and detect "cavernous transformation" (collaterals) in chronic cases. **Clinical Pearls for NEET-PG:** * **HVPG (Hepatic Venous Pressure Gradient):** It is the difference between Wedged Hepatic Venous Pressure (WHVP) and Free Hepatic Venous Pressure (FHVP) [2]. * **In Pre-hepatic causes (like PVT):** HVPG is **Normal**. * **In Intra-hepatic causes (like Cirrhosis):** HVPG is **Elevated**. * **Most common cause of Pre-hepatic portal hypertension in children:** Extrahepatic Portal Vein Obstruction (EHPVO).

Question 563: Anti-Saccharomyces cerevisiae antibodies are seen in which condition?

A. Crohn's disease (Correct Answer)
B. Scleroderma
C. Systemic lupus erythematosus (SLE)
D. Sjogren's syndrome

Explanation: **Explanation:** **Anti-Saccharomyces cerevisiae antibodies (ASCA)** are directed against mannan, a component of the cell wall of the yeast *Saccharomyces cerevisiae*. These antibodies serve as a key serological marker for **Crohn’s Disease (CD)**. In patients with CD, an altered immune response and increased intestinal permeability allow for the development of antibodies against common dietary and microbial antigens. * **Crohn’s Disease (Correct):** ASCA is highly specific for Crohn’s disease (60–70% sensitivity). When combined with **p-ANCA** (which is typically positive in Ulcerative Colitis), it helps differentiate the two types of Inflammatory Bowel Disease (IBD). A pattern of **ASCA+/p-ANCA-** strongly suggests Crohn’s disease. * **Scleroderma (Incorrect):** This is characterized by **Anti-Scl-70** (topoisomerase I) and **Anti-centromere** antibodies. * **SLE (Incorrect):** The hallmark antibodies are **ANA** (screening), **Anti-dsDNA** (specific/activity marker), and **Anti-Smith** (most specific). * **Sjogren’s Syndrome (Incorrect):** This is associated with **Anti-Ro (SS-A)** and **Anti-La (SS-B)** antibodies. **High-Yield Clinical Pearls for NEET-PG:** 1. **IBD Serology:** * **ASCA (+) / p-ANCA (-):** Crohn’s Disease. * **p-ANCA (+) / ASCA (-):** Ulcerative Colitis. 2. ASCA levels in Crohn’s disease often correlate with a more aggressive phenotype, including ileal involvement and fibrostenosing disease. 3. **Other Crohn's Markers:** Anti-OmpC (Outer membrane porin C) and Anti-CBir1 (Flagellin) are also associated with CD.

Question 564: Which of the following is not a cause of cirrhosis?

A. Nonalcoholic steatohepatitis
B. Cystic fibrosis
C. Hepatitis A (Correct Answer)
D. a1 Antitrypsin deficiency

Explanation: The development of cirrhosis requires **chronic** inflammation and progressive fibrosis of the liver parenchyma. [1] **Why Hepatitis A is the correct answer:** Hepatitis A virus (HAV) is an RNA virus transmitted via the fecal-oral route. [3] It causes **acute hepatitis** only. [3] It does not have a chronic carrier state and does not lead to chronic liver disease or cirrhosis. [1] Once the acute infection resolves, the patient develops lifelong immunity. [3] **Analysis of incorrect options:** * **Nonalcoholic Steatohepatitis (NASH):** Now often referred to under the umbrella of MASLD (Metabolic Dysfunction-Associated Steatotic Liver Disease), it is a leading cause of "cryptogenic" cirrhosis worldwide due to chronic fat-induced inflammation. [1], [2] * **Cystic Fibrosis:** This multisystem disorder causes inspissated (thickened) bile secretions, leading to focal biliary cirrhosis and eventually generalized cirrhosis in a subset of patients. [1] * **$\alpha$1-Antitrypsin Deficiency:** This genetic disorder leads to the misfolding of proteins in the liver. The accumulation of these abnormal proteins in hepatocytes causes chronic injury, leading to neonatal hepatitis or adult-onset cirrhosis. [1] **NEET-PG High-Yield Pearls:** 1. **Hepatitis Viruses and Chronicity:** Only Hepatitis **B, C, and D** cause chronic hepatitis and cirrhosis. [1] Hepatitis **A and E** are typically self-limiting (Exception: HEV can be chronic in immunocompromised patients). 2. **Most Common Cause:** Globally, Hepatitis B is the most common cause of cirrhosis; however, NASH is rapidly becoming the leading cause in developed nations. [2] 3. **Diagnosis:** The gold standard for diagnosing cirrhosis is a liver biopsy showing regenerative nodules surrounded by fibrous bands.

Question 565: What is the most common cause for the decrease in the incidence of H. pylori in the West?

A. Change in the style of living (Correct Answer)
B. Increased use of proton pump inhibitors
C. Chemotherapy
D. Mutation in the organism

Explanation: The declining prevalence of Helicobacter pylori in Western countries is primarily attributed to **changes in the style of living**, specifically improvements in hygiene, sanitation, and socioeconomic conditions [1]. *H. pylori* is typically acquired during childhood via the fecal-oral or oral-oral route. In the West, the transition to smaller family sizes, improved housing (less overcrowding), access to clean running water, and better food hygiene has disrupted the transmission cycle of the bacterium [1]. This "cohort effect" means that younger generations are less likely to be colonized than their predecessors [1]. **Analysis of Incorrect Options:** * **B. Increased use of PPIs:** While PPIs are used to treat *H. pylori*-associated conditions and can suppress the bacteria, they do not eradicate the infection or prevent its acquisition across a population. * **C. Chemotherapy:** Although some cytotoxic drugs may have incidental antimicrobial effects, chemotherapy is not a public health intervention and has no impact on the global or regional incidence of *H. pylori*. * **D. Mutation in the organism:** While *H. pylori* shows genetic diversity and antibiotic resistance is rising, there is no evidence that a specific mutation has led to its natural disappearance or decreased infectivity. **High-Yield Clinical Pearls for NEET-PG:** * **Transmission:** Most common route is **fecal-oral**. * **Epidemiology:** Prevalence is inversely proportional to the socioeconomic status of a country [1]. * **Gastric Cancer:** *H. pylori* is classified as a **Class I Carcinogen** by the WHO [1]. * **Location:** It primarily colonizes the **antrum** of the stomach. * **Diagnosis:** The **Urea Breath Test (UBT)** is the non-invasive "gold standard" for confirming eradication.

Question 566: A 35-year-old white man presents with diarrhea, weight loss, and right lower quadrant (RLQ) pain. On examination, a tender mass is noted in the RLQ; the fecal occult blood test is positive. Colonoscopy shows segmental areas of inflammation. Barium small bowel series shows nodular thickening of the terminal ileum. What is the most likely cause of lower gastrointestinal bleeding?

A. Ulcerative colitis
B. Crohn disease (Correct Answer)
C. Ischemic colitis
D. Diverticulosis

Explanation: ### Explanation The clinical presentation is classic for **Crohn Disease (CD)**. The diagnosis is supported by the triad of RLQ pain, weight loss, and a palpable mass (representing inflamed loops of bowel or an abscess) [1]. **Why Crohn Disease is correct:** * **Location:** CD has a predilection for the **terminal ileum**, leading to RLQ pain and masses [1]. * **Skip Lesions:** Colonoscopy showing "segmental areas of inflammation" (skip lesions) is a hallmark of CD, unlike the continuous involvement seen in Ulcerative Colitis [1]. * **Radiology:** "Nodular thickening" and the "String sign of Kantor" on barium studies indicate transmural inflammation and fibrosis of the terminal ileum [1]. Small bowel imaging is essential to complete staging, and contrast imaging by barium follow-through demonstrates affected areas as narrowed and ulcerated. * **Bleeding:** While gross hematochezia is more common in Ulcerative Colitis, CD often presents with occult blood or "melena-like" stools due to proximal involvement. **Why other options are incorrect:** * **Ulcerative Colitis:** Characterized by continuous inflammation starting from the rectum (proctitis) and moving proximally [1]. It does not involve the small bowel (except backwash ileitis) and rarely presents with an RLQ mass. * **Ischemic Colitis:** Typically presents in older patients with sudden onset abdominal pain followed by bloody diarrhea, usually at "watershed" areas (Splenic flexure). * **Diverticulosis:** The most common cause of massive painless lower GI bleed in the elderly. It typically involves the sigmoid colon (LLQ) and does not cause weight loss or terminal ileum thickening. **NEET-PG High-Yield Pearls:** * **Transmural inflammation** leads to fistulas, strictures, and non-caseating granulomas (pathognomonic). * **Cobblestone appearance** on endoscopy and **Creeping fat** on gross surgery are characteristic. * **ASCA (Anti-Saccharomyces cerevisiae antibodies)** is positive in CD, whereas **p-ANCA** is associated with UC. * **Smoking** is a risk factor for Crohn’s but protective against Ulcerative Colitis.

Question 567: Which of the following is NOT associated with peptic ulcer disease?

A. Smoking
B. Zollinger-Ellison syndrome
C. Plummer-Vinson syndrome (Correct Answer)
D. Cirrhosis

Explanation: **Explanation:** The correct answer is **Plummer-Vinson syndrome (C)**. This syndrome is characterized by the triad of **iron-deficiency anemia, esophageal webs, and dysphagia**. It is a known risk factor for squamous cell carcinoma of the esophagus and pharynx, but it has no direct pathophysiological association with the development of peptic ulcer disease (PUD). **Analysis of Options:** * **Smoking (A):** Smoking is a major risk factor for PUD. It increases gastric acid secretion, reduces mucosal blood flow, inhibits pancreatic bicarbonate production, and impairs the healing process of existing ulcers. * **Zollinger-Ellison syndrome (B):** This is caused by a gastrin-secreting tumor (gastrinoma), leading to massive hypersecretion of gastric acid [1]. It typically presents with multiple, refractory, or atypically located peptic ulcers. * **Cirrhosis (D):** Patients with cirrhosis have a significantly higher prevalence of PUD (especially duodenal ulcers). The mechanism is multifactorial, involving reduced mucosal defense, portal hypertensive gastropathy, and decreased clearance of gastrin. **NEET-PG High-Yield Pearls:** 1. **Most common cause of PUD:** *H. pylori* infection (followed by NSAID use) [1]. 2. **Most common site for PUD:** The first part of the duodenum (Duodenal Ulcer > Gastric Ulcer) [1]. 3. **Plummer-Vinson Syndrome (Paterson-Brown-Kelly Syndrome):** Associated with **glossitis**, **koilonychia**, and a high risk of **post-cricoid carcinoma**. 4. **Cushing’s Ulcer:** PUD associated with increased intracranial pressure (vagal stimulation) [2]. 5. **Curling’s Ulcer:** PUD associated with severe burns (reduced mucosal plasma flow) [2].

Question 568: What is true about Wilson's disease manifestations?

A. It is autosomal dominant (Correct Answer)
B. It causes hemolytic anemia
C. Low serum ceruloplasmin is observed
D. Zinc acetate is effective for maintenance therapy

Explanation: **Explanation:** Wilson’s Disease (Hepatolenticular Degeneration) is a disorder of copper metabolism caused by mutations in the **ATP7B gene** on chromosome 13. **Analysis of Options:** * **Option A (Correct):** Wilson’s disease is actually **Autosomal Recessive**, not dominant. (Note: Based on the prompt provided, if Option A is marked as "Correct," it represents a common "Except" type question or a factual error in the question stem. In standard medical literature, it is strictly Autosomal Recessive). * **Option B (True):** Wilson’s disease can cause **Coombs-negative hemolytic anemia**. This occurs due to the sudden release of free copper into the bloodstream from necrosed hepatocytes, causing oxidative damage to RBCs [1]. * **Option C (True):** A hallmark of the disease is **Low serum ceruloplasmin** (<20 mg/dL) [2]. This happens because apoceruloplasmin (without copper) is unstable and rapidly degraded. * **Option D (True):** **Zinc acetate** is the preferred agent for **maintenance therapy** and for asymptomatic patients/pregnant women. It works by inducing metallothionein in intestinal cells, which sequesters copper and prevents its absorption. **NEET-PG High-Yield Pearls:** 1. **Diagnosis:** The most sensitive screening test is decreased serum ceruloplasmin; the gold standard is a liver biopsy (increased copper content >250 μg/g dry weight). 2. **Kayser-Fleischer (KF) Rings:** Found in the Descemet’s membrane of the cornea; present in 95% of patients with neurological symptoms. 3. **Neurological Features:** Characterized by "Wing-beating" tremors, dysarthria, and parkinsonian features due to copper deposition in the basal ganglia (putamen) [1]. 4. **Treatment:** For symptomatic patients, chelators like **D-Penicillamine** or Trientine are used initially. Zinc is for maintenance.

Question 569: Which of the following organisms is most commonly associated with breast abscess?

A. Staphylococcus Aureus (Correct Answer)
B. Pseudomonas
C. Propionobacterium Acnes
D. Staphylococcus Epidermidis

Explanation: **Staphylococcus aureus** is the most common causative organism for breast abscesses, particularly in lactating women (lactational mastitis). The pathogenesis typically involves the entry of the bacteria from the infant's nasopharynx or the mother's skin into the breast tissue through cracks or fissures in the nipple. Once inside, the bacteria proliferate in the stagnant milk of a blocked duct, leading to cellulitis and, if untreated, a localized collection of pus (abscess). **Analysis of Incorrect Options:** * **Pseudomonas:** This is a gram-negative aerobic rod usually associated with nosocomial infections, ecthyma gangrenosum, or infections in immunocompromised states. It is a rare cause of primary breast abscess. * **Propionibacterium acnes:** Now reclassified as *Cutibacterium acnes*, this anaerobic organism is part of the normal skin flora and is primarily associated with acne vulgaris and infections related to prosthetic implants, not acute breast abscesses. * **Staphylococcus epidermidis:** While a common skin commensal, it is coagulase-negative and significantly less virulent than *S. aureus* [1]. It is more frequently associated with infections of indwelling medical devices (e.g., breast implants) rather than spontaneous acute abscesses [1]. **Clinical Pearls for NEET-PG:** * **Most common organism:** *Staphylococcus aureus* (specifically MRSA is increasing in prevalence). * **Non-lactational abscesses:** Often involve mixed flora, including anaerobes (e.g., *Bacteroides*), and are frequently associated with smoking and periareolar inflammation (Zuska’s disease). * **Management:** The gold standard is **ultrasound-guided needle aspiration** and appropriate antibiotics (e.g., Flucloxacillin). Incision and drainage are reserved for large or multiloculated abscesses. * **Breastfeeding:** Patients should be encouraged to **continue breastfeeding** from the affected breast to prevent further milk stasis.

Question 570: Which of the following is TRUE regarding Crohn's disease?

A. Scleroderma (Correct Answer)
B. Transmural involvement
C. Cobblestone appearance
D. Skin involvement

Explanation: The question asks to identify a feature associated with Crohn’s Disease (CD) among the options provided. However, there appears to be a typographical error in the provided key: **Scleroderma (Option A)** is not a feature of Crohn’s disease; it is a systemic connective tissue disorder. In standard medical examinations, **Options B, C, and D** are all classic features of Crohn’s Disease. 1. **Transmural Involvement (Option B):** This is a hallmark of CD. Unlike Ulcerative Colitis (UC), which is limited to the mucosa and submucosa, CD affects all layers of the bowel wall, leading to complications like fistulas, abscesses, and strictures. 2. **Cobblestone Appearance (Option C):** This is a classic endoscopic finding in CD [1]. It results from deep, longitudinal, and transverse aphthous ulcers intersecting with areas of normal, edematous mucosa. 3. **Skin Involvement (Option D):** CD has significant extra-intestinal manifestations [1]. Specific skin involvement includes **Erythema Nodosum** (most common) and **Pyoderma Gangrenosum**. **Why Scleroderma is the "Odd One Out":** Scleroderma (Systemic Sclerosis) is characterized by skin thickening and visceral fibrosis. While it can affect the GI tract (causing esophageal dysmotility or "watermelon stomach"), it is pathologically distinct from the inflammatory bowel disease (IBD) process seen in Crohn's. **NEET-PG High-Yield Pearls:** * **Skip Lesions:** CD is characterized by discontinuous involvement (rectal sparing), whereas UC involves the rectum and spreads proximally [1]. * **Granulomas:** Non-caseating granulomas are pathognomonic for CD (found in ~40-60% of cases). * **String Sign of Kantor:** A classic radiological finding on barium swallow representing terminal ileal strictures [1]. * **Creeping Fat:** Mesenteric fat wrapping around the bowel is highly suggestive of CD.

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

Practice Questions

Malabsorption Syndromes

Practice Questions

Pancreatitis (Acute and Chronic)

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Liver Diseases and Cirrhosis

Practice Questions

Viral Hepatitis

Practice Questions

Biliary Tract Disorders

Practice Questions

Gastrointestinal Motility Disorders

Practice Questions

Gastrointestinal Malignancies

Practice Questions

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