Gastroenterology — MCQs

A 65-year-old female presented to the OPD with a complaint of abdominal pain immediately after eating, episodes of vomiting, and diarrhea. She has a 20-year history of coronary artery disease. Her BP is 160/100 mm Hg and pulse is 80/min. On abdominal examination, there is no tenderness or rigidity. What is the most likely diagnosis?

Q65Easy

This condition is caused by:

Q66Easy

Small bowel vascular ectasia is associated with:

Q67Medium

All the following statements regarding Hepatitis B are true except?

Q68Medium

What is true in a case of chronic pancreatitis?

Q69Medium

A 65-year-old patient with coronary artery disease was on Aspirin for 2 years. He now complains of black stools. Abdominal examination is normal. What is the most probable diagnosis?

Q70Medium

A patient develops a persistent macrocytic anemia. Serum folate levels are normal, but serum vitamin B12 levels are low. Oral vitamin absorption studies demonstrate that the patient is unable to absorb vitamin B12 in adequate amounts. Cancer of which of the following organs is most strongly associated with this patient's condition?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 61: Which of the following is a cause for conjugated hyperbilirubinemia?

A. Massive hematoma
B. Gilbert's syndrome
C. Crigler-Najjar syndrome
D. Rotor's syndrome (Correct Answer)

Explanation: **Explanation:** Hyperbilirubinemia is classified into unconjugated (indirect) and conjugated (direct) based on whether the bilirubin has undergone glucuronidation in the liver. **1. Why Rotor’s Syndrome is Correct:** Rotor’s syndrome is an autosomal recessive condition characterized by a defect in the **hepatic storage and reuptake** of conjugated bilirubin (specifically involving OATP1B1 and OATP1B3 transporters). This leads to a leak of conjugated bilirubin back into the bloodstream. It presents as chronic, mild conjugated hyperbilirubinemia with normal liver enzymes and a non-pigmented liver (unlike Dubin-Johnson syndrome). **2. Why the Other Options are Incorrect:** * **Massive Hematoma:** This causes **unconjugated** hyperbilirubinemia. The breakdown of large amounts of hemoglobin (extravascular hemolysis) overwhelms the liver's capacity to conjugate bilirubin. * **Gilbert’s Syndrome:** This is a common, benign condition caused by reduced activity of the enzyme **UGT1A1** (approx. 30% of normal). It results in mild **unconjugated** hyperbilirubinemia, often triggered by stress, fasting, or illness. * **Crigler-Najjar Syndrome:** This involves a severe deficiency (Type II) or total absence (Type I) of the **UGT1A1** enzyme, leading to significant **unconjugated** hyperbilirubinemia and a risk of kernicterus in infants. **High-Yield Clinical Pearls for NEET-PG:** * **Dubin-Johnson vs. Rotor’s:** Both cause conjugated hyperbilirubinemia. Dubin-Johnson features a **black/pigmented liver** (due to melanin-like pigment) and abnormal urinary coproporphyrin I levels (>80%), whereas Rotor’s has a **normal-appearing liver**. * **The "U" Rule:** Gilbert’s and Crigler-Najjar both start with consonants that remind us of **U**nconjugated hyperbilirubinemia. * **Diagnostic Clue:** If the question mentions "dark urine" but no urobilinogen, think conjugated hyperbilirubinemia (as unconjugated bilirubin is not water-soluble and cannot pass into urine).

Question 62: All of the following are common causes of hematemesis except?

A. Chronic peptic ulcer
B. Pernicious anemia (Correct Answer)
C. Esophageal varices
D. Carcinoma of stomach

Explanation: Hematemesis (vomiting of blood) indicates an upper gastrointestinal (UGI) bleed, typically originating proximal to the ligament of Treitz. **Why Pernicious Anemia is the correct answer:** Pernicious anemia is an autoimmune condition characterized by antibodies against parietal cells or intrinsic factor, leading to **atrophic gastritis** [1]. This results in **achlorhydria** (absence of hydrochloric acid) and vitamin B12 deficiency [1]. Because the gastric mucosa is atrophic (thinned out) and acid production is absent, the environment is not conducive to acute ulceration or erosive bleeding. While it increases the long-term risk of gastric adenocarcinoma, it is not a direct or common cause of hematemesis. **Analysis of incorrect options:** * **Chronic Peptic Ulcer:** This is the **most common cause** of UGI bleeding worldwide [2]. Erosion into a mucosal vessel (e.g., gastroduodenal artery) leads to significant hematemesis [3]. * **Esophageal Varices:** Common in patients with portal hypertension (cirrhosis). These represent dilated submucosal veins that can rupture, causing massive, life-threatening hematemesis [2]. * **Carcinoma of Stomach:** Malignant ulcers are friable and prone to chronic oozing or acute bleeding, making it a well-recognized cause of hematemesis in older populations [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of Hematemesis:** Peptic Ulcer Disease (PUD) [2]. * **Mallory-Weiss Tear:** Hematemesis following bouts of forceful vomiting/retching (often post-alcohol binge). * **Dieulafoy’s Lesion:** A rare cause of massive hematemesis due to an abnormally large submucosal artery that erodes the overlying epithelium. * **Rockall Score/Blatchford Score:** Used to risk-stratify patients with UGI bleeding [2].

Question 63: A patient with cirrhosis of the liver has the following coagulation parameters: Platelet count 2,00,000/mm 3, Prothrombin time 25s (control 12s), Activated partial thromboplastin time 60s (control 35s), Thrombin time 15s (control 15s). Which of the following is true for this patient?

A. D-dimer will be normal (Correct Answer)
B. Fibrinogen will be <100 mg/dL
C. Antithrombin III will be high
D. Protein C will be elevated

Explanation: In patients with cirrhosis, the liver's synthetic function is impaired, leading to a decrease in both pro-coagulant and anti-coagulant factors. This scenario describes a typical "rebalanced" hemostatic state in chronic liver disease. **1. Why Option A is Correct:** The patient’s parameters show prolonged PT and aPTT but a **normal Thrombin Time (TT)**. Thrombin Time measures the conversion of fibrinogen to fibrin [1]. A normal TT indicates that fibrinogen levels are quantitatively and qualitatively adequate. **D-dimer** is a degradation product of cross-linked fibrin. In stable cirrhosis, while there is low-grade activation of coagulation, there is no massive systemic fibrinolysis (unlike DIC), so D-dimer levels typically remain within normal limits or are only minimally elevated. **2. Why Incorrect Options are Wrong:** * **Option B:** Since the Thrombin Time is normal (15s), the fibrinogen level is likely within the normal range (>150-200 mg/dL). Fibrinogen is an acute-phase reactant and is often preserved until end-stage liver failure. * **Option C & D:** Antithrombin III, Protein C, and Protein S are all synthesized by the liver. In cirrhosis, their levels **decrease** alongside pro-coagulant factors (Factors II, VII, IX, X) [1]. They would be low, not high or elevated. **Clinical Pearls for NEET-PG:** * **PT/INR** is the most sensitive marker of liver synthetic function because Factor VII has the shortest half-life (~6 hours) [2]. * **Factor VIII and von Willebrand Factor** are high-yield exceptions; they are often **elevated** in cirrhosis because they are produced by endothelial cells, not hepatocytes. * **Rebalanced Hemostasis:** Despite prolonged PT/aPTT, cirrhotic patients are not "auto-anticoagulated" and are actually at risk for both bleeding and thrombosis (e.g., Portal Vein Thrombosis). * **DIC vs. Cirrhosis:** In DIC, both TT is prolonged and D-dimer is significantly elevated; in stable cirrhosis, TT is often normal [1].

Question 64: A 65-year-old female presented to the OPD with a complaint of abdominal pain immediately after eating, episodes of vomiting, and diarrhea. She has a 20-year history of coronary artery disease. Her BP is 160/100 mm Hg and pulse is 80/min. On abdominal examination, there is no tenderness or rigidity. What is the most likely diagnosis?

A. Peptic ulcer
B. Wilkie's disease
C. Ulcerative colitis
D. Chronic mesenteric ischemia (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Chronic Mesenteric Ischemia (CMI)** The clinical presentation of **"abdominal angina"**—postprandial abdominal pain, fear of eating (sitophobia), and weight loss—in an elderly patient with established atherosclerotic disease (20-year history of CAD and hypertension) is classic for Chronic Mesenteric Ischemia. * **Pathophysiology:** CMI occurs due to atherosclerotic narrowing of at least two of the three major splanchnic vessels (Celiac axis, SMA, or IMA) [3]. When food enters the GI tract, the demand for blood flow increases; however, the stenosed vessels cannot meet this demand, leading to relative ischemia and pain. * **Clinical Clue:** The hallmark is the **discrepancy** between the severity of the patient's pain and the physical examination findings (no tenderness or rigidity), often referred to as "pain out of proportion to physical findings" [1]. **Why Incorrect Options are Wrong:** * **A. Peptic Ulcer:** While it causes postprandial pain, it is usually associated with epigastric tenderness [4]. In gastric ulcers, pain occurs immediately, whereas in duodenal ulcers, pain is relieved by food. It does not typically explain the systemic atherosclerotic background. * **B. Wilkie’s Disease (SMA Syndrome):** This involves compression of the 3rd part of the duodenum between the SMA and the Aorta. It usually occurs in young, thin patients after rapid weight loss, not in elderly hypertensive patients with CAD. * **C. Ulcerative Colitis:** This presents with bloody diarrhea, tenesmus, and crampy pain [2]. The pain is not strictly "immediately after eating" and would likely show abdominal tenderness. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Conventional Catheter Angiography. * **Initial Screening Tool:** Duplex Ultrasound (shows increased peak systolic velocities). * **Classic Triad:** Postprandial pain, weight loss, and abdominal bruit (though bruit is present in only 50%). * **Treatment:** Revascularization (Endovascular stenting or surgical bypass) [3].

Question 65: This condition is caused by:

A. Paralytic ileus (Correct Answer)
B. Hyperkalemia
C. Acute intestinal obstruction
D. Malnutrition

Explanation: ***Paralytic ileus*** - Characterized by **generalized bowel dilatation** with **gas-filled loops** throughout the small and large intestine on abdominal X-ray, without clear transition points. - Presents with **absent or diminished bowel sounds**, abdominal distension, and **delayed passage of gas and stool** due to impaired intestinal motility. *Hyperkalemia* - Primarily causes **cardiac arrhythmias** and **muscle weakness**, not the generalized bowel dilatation pattern seen on imaging. - While severe hyperkalemia can contribute to **ileus**, it's not the primary radiological diagnosis based on the bowel gas pattern. *Acute intestinal obstruction* - Shows **localized bowel dilatation** proximal to the obstruction with a clear **transition zone** and **air-fluid levels** in a step-ladder pattern. - Typically presents with **high-pitched bowel sounds** and **cramping abdominal pain**, contrasting with the quiet abdomen of paralytic ileus. *Malnutrition* - Causes **generalized weakness** and **delayed wound healing** but doesn't produce the characteristic bowel gas distribution pattern. - While malnutrition can predispose to **delayed gastric emptying**, it doesn't directly cause the radiological findings of paralytic ileus.

Question 66: Small bowel vascular ectasia is associated with:

A. Retroviral infection
B. Amyloidosis
C. Chronic renal failure (Correct Answer)
D. Watermelon stomach

Explanation: Small bowel vascular ectasia (Angiodysplasia) is the most common vascular anomaly of the gastrointestinal tract. It consists of dilated, tortuous, thin-walled vessels (capillaries, venules, and arteriovenous communications) primarily involving the mucosa and submucosa. Why Chronic Renal Failure (CRF) is correct: There is a well-established clinical association between chronic renal failure and angiodysplasia [1]. Patients with End-Stage Renal Disease (ESRD) have a higher prevalence of these lesions, which are often multiple and more prone to bleeding. The pathophysiology is linked to uremic platelet dysfunction [1], which increases the risk of hemorrhage from these fragile vessels. Additionally, some theories suggest that the hyperdynamic circulation in renal failure contributes to the formation of these ectatic vessels. Analysis of Incorrect Options: * Retroviral infection: There is no direct association between HIV/AIDS and small bowel vascular ectasia. HIV is more commonly associated with Kaposi sarcoma or opportunistic infections (CMV, MAC) of the bowel. * Amyloidosis: While amyloidosis can cause GI bleeding through friable mucosa or protein-losing enteropathy, it is not a primary risk factor for vascular ectasia. * Watermelon stomach: Also known as GAVE (Gastric Antral Vascular Ectasia), this is a distinct clinical entity. While it is a form of vascular ectasia, it is specifically located in the stomach (antrum) and is classically associated with Cirrhosis or Systemic Sclerosis, rather than being a cause/association of small bowel ectasia. High-Yield Clinical Pearls for NEET-PG: * Most common site: Cecum and ascending colon (due to high wall tension). * Associated Conditions: Chronic Renal Failure [1], Aortic Stenosis (Heyde’s Syndrome), and von Willebrand disease [1]. * Diagnosis: Gold standard is Angiography (shows tufts or early filling veins), though often diagnosed via endoscopy/capsule endoscopy. * Management: Endoscopic therapy (Argon Plasma Coagulation) is the treatment of choice for bleeding lesions.

Question 67: All the following statements regarding Hepatitis B are true except?

A. Delta hepatitis can occur as a co-infection or superinfection.
B. Hepatitis e antigen indicates that active viral replication is occurring.
C. Steroids are the drug of choice in chronic Hepatitis B. (Correct Answer)
D. Hepatitis B can lead to Hepato Cellular Carcinoma.

Explanation: ### Explanation **1. Why Option C is the correct answer (The "Except" statement):** Steroids are **not** the drug of choice for Chronic Hepatitis B (CHB). In fact, corticosteroids are generally contraindicated because they can suppress the immune response, leading to increased viral replication. Abrupt withdrawal of steroids in a CHB patient can trigger a life-threatening "biochemical flare" or acute exacerbation. The standard of care for CHB involves antiviral therapy with **Nucleoside/Nucleotide analogues** (e.g., Tenofovir, Entecavir) or **Pegylated Interferon-alpha** [1]. **2. Analysis of other options:** * **Option A:** Hepatitis D (Delta virus) is a defective RNA virus that requires the HBsAg coat to replicate. It occurs either as a **Co-infection** (simultaneous infection with HBV, usually self-limiting) or a **Superinfection** (HDV infecting a chronic HBV carrier, often leading to rapid progression to cirrhosis). * **Option B:** **HBeAg** is a qualitative marker of high infectivity and active viral replication [1]. Its presence correlates with high levels of HBV DNA in the serum. * **Option D:** HBV is a well-known oncogenic virus. Chronic inflammation and the integration of HBV DNA into the host genome can lead to **Hepatocellular Carcinoma (HCC)**, even in the absence of cirrhosis [1]. ### NEET-PG High-Yield Pearls * **Window Period:** The interval where HBsAg and Anti-HBs are both negative; **Anti-HBc IgM** is the only diagnostic marker during this phase [1]. * **First marker to appear:** HBsAg (appears before symptoms) [1]. * **Marker of Immunity:** Anti-HBs (appears after vaccination or recovery) [1]. * **Ground Glass Hepatocytes:** The characteristic histopathological finding in Chronic HBV due to HBsAg accumulation in the endoplasmic reticulum. * **Extrahepatic Manifestations:** Polyarteritis Nodosa (PAN) and Membranous Nephropathy are strongly associated with HBV.

Question 68: What is true in a case of chronic pancreatitis?

A. Pseudocyst lined with gastric epithelium
B. Complete destruction of pancreatic tissue (Correct Answer)
C. Most common cause is biliary
D. Gene mutation is seen

Explanation: **Explanation:** Chronic pancreatitis is characterized by **irreversible** morphologic changes. The core pathophysiology involves progressive inflammation leading to the **complete destruction of pancreatic parenchyma** (both exocrine and endocrine components), which is eventually replaced by dense fibrous connective tissue [1]. This leads to the classic triad of steatorrhea, diabetes mellitus, and pancreatic calcifications. **Analysis of Options:** * **Option B (Correct):** As the disease progresses, there is a total loss of acinar and islet cell mass, resulting in permanent functional insufficiency [1]. * **Option A (Incorrect):** Pancreatic pseudocysts are "pseudo" because they **lack an epithelial lining**. They are walled off by granulation and fibrous tissue, not gastric epithelium. * **Option C (Incorrect):** The most common cause of chronic pancreatitis worldwide is **chronic alcohol consumption** (70-80%) [1]. Biliary tract disease (gallstones) is a common cause of *acute* pancreatitis but rarely leads to chronic disease. * **Option D (Incorrect):** While gene mutations (e.g., **PRSS1, SPINK1, CFTR**) are associated with hereditary and idiopathic forms, they are not a universal finding in all cases of chronic pancreatitis. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Steatorrhea + Diabetes + Pancreatic Calcifications (seen on X-ray/CT) [1], [2]. * **Most sensitive test:** Secretin stimulation test (shows decreased bicarbonate output). * **Best initial imaging:** Contrast-Enhanced CT (CECT) to visualize calcifications and ductal dilation ("Chain of Lakes" appearance) [2]. * **Pain Management:** Steatorrhea is managed with pancreatic enzyme replacement therapy (PERT), which also helps reduce pain by suppressing CCK release.

Question 69: A 65-year-old patient with coronary artery disease was on Aspirin for 2 years. He now complains of black stools. Abdominal examination is normal. What is the most probable diagnosis?

A. Ileocecal TB
B. Carcinoma of colon
C. Esophageal varices
D. Duodenal ulcer (Correct Answer)

Explanation: **Explanation:** The patient presents with **melena** (black, tarry stools), which is a hallmark sign of **Upper Gastrointestinal Bleeding (UGIB)**. The most significant clue in the history is the long-term use of **Aspirin**, a Non-Steroidal Anti-Inflammatory Drug (NSAID) [1]. **1. Why Duodenal Ulcer is correct:** NSAIDs like Aspirin inhibit the COX-1 enzyme, leading to decreased synthesis of prostaglandins. Prostaglandins are essential for maintaining the gastric mucosal barrier. Their depletion results in mucosal injury, making **Peptic Ulcer Disease (PUD)** the most common cause of UGIB. Statistically, duodenal ulcers are more common than gastric ulcers in the context of chronic NSAID use and are a frequent source of melena [1]. **2. Why other options are incorrect:** * **Ileocecal TB:** Usually presents with chronic abdominal pain, fever, weight loss, and altered bowel habits (diarrhea/constipation). While it can cause bleeding, it typically presents as hematochezia (bright red blood) or occult blood, not gross melena. * **Carcinoma of Colon:** Right-sided colon cancers cause occult bleeding and anemia; left-sided cancers cause altered bowel habits and hematochezia. Melena is rare as the bleeding source is distal to the ligament of Treitz. * **Esophageal Varices:** While a common cause of UGIB, it is associated with portal hypertension (cirrhosis, jaundice, splenomegaly). This patient has no history of liver disease but has a clear risk factor (Aspirin) for PUD [2]. **Clinical Pearls for NEET-PG:** * **Most common cause of UGIB:** Peptic Ulcer Disease [2]. * **Melena** indicates that blood has been present in the GI tract for at least 8 hours and usually originates proximal to the ligament of Treitz. * **Prophylaxis:** Patients on long-term Aspirin with high GI risk should be co-prescribed a Proton Pump Inhibitor (PPI) [1].

Question 70: A patient develops a persistent macrocytic anemia. Serum folate levels are normal, but serum vitamin B12 levels are low. Oral vitamin absorption studies demonstrate that the patient is unable to absorb vitamin B12 in adequate amounts. Cancer of which of the following organs is most strongly associated with this patient's condition?

A. Colon
B. Duodenum
C. Esophagus
D. Stomach (Correct Answer)

Explanation: **Explanation:** The patient presents with **macrocytic anemia** and **Vitamin B12 deficiency** (low serum B12, normal folate) due to malabsorption. The most common cause of Vitamin B12 malabsorption related to the stomach is **Pernicious Anemia**. **Why the Stomach is Correct:** Vitamin B12 (cobalamin) absorption requires **Intrinsic Factor (IF)**, a glycoprotein secreted by the **parietal cells** of the gastric fundus and body [3]. In Pernicious Anemia, autoimmune destruction of parietal cells leads to a lack of IF, preventing B12 absorption in the terminal ileum [1]. Patients with Pernicious Anemia have a **3-fold to 6-fold increased risk of Gastric Adenocarcinoma** and are also at risk for gastric carcinoid tumors due to chronic hypergastrinemia and atrophic gastritis [2]. **Why Other Options are Incorrect:** * **Colon:** Colonic pathologies (like adenocarcinoma) typically cause microcytic anemia due to chronic occult blood loss (iron deficiency), not macrocytic anemia. * **Duodenum:** While B12 binds to R-binders in the stomach and is released by pancreatic enzymes in the duodenum, the primary pathology leading to chronic B12 deficiency and cancer risk is gastric, not duodenal. * **Esophagus:** Esophageal cancer is associated with smoking, alcohol, and GERD (Barrett’s), but it does not physiologically interfere with B12 absorption or Intrinsic Factor production. **NEET-PG High-Yield Pearls:** * **Site of Absorption:** Vitamin B12 is absorbed in the **Terminal Ileum**. * **Schilling Test:** Historically used to differentiate between IF deficiency (Stomach), bacterial overgrowth, or ileal disease. * **Blood Film:** Look for **Hypersegmented Neutrophils** (earliest sign) and Megaloblasts. * **Associations:** Pernicious anemia is often associated with other autoimmune conditions like Vitiligo, Hashimoto’s thyroiditis, and Type 1 Diabetes.

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

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

Practice Questions

Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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