Gastroenterology — MCQs

A 40-year-old woman with a history of hyperparathyroidism presents with a 2-month history of burning epigastric pain, relieved by antacids or food. She also reports a recent history of tarry stools and denies taking aspirin or NSAIDs. Laboratory studies show a microcytic, hypochromic anemia. Gastroscopy reveals a bleeding mucosal defect in the antrum. Which of the following best characterizes the pathogenesis of epigastric pain in this patient?

Q118Easy

Hereditary chronic pancreatitis is caused by mutation of which gene?

Q119Easy

What is the most common cause for Budd-Chiari syndrome?

Q120Easy

All of the following are causes of acute pancreatitis except?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 111: A patient presents with a history of diarrhea for several years and recent onset of pruritus and elevated alkaline phosphatase. Laboratory tests show normal SGOT/PT, and ultrasound reveals no gallstones or biliary tract abnormalities. What is the most likely diagnosis?

A. Hodgkin's Lymphoma
B. Sclerosing cholangitis (Correct Answer)
C. Autoimmune Hepatitis
D. Viral Hepatitis

Explanation: **Explanation:** The clinical presentation points toward **Primary Sclerosing Cholangitis (PSC)**, a chronic cholestatic liver disease characterized by inflammation and fibrosis of the intrahepatic and extrahepatic bile ducts [1]. **1. Why Sclerosing Cholangitis is correct:** * **Association with IBD:** The "history of diarrhea for several years" is a classic hint for **Ulcerative Colitis (UC)**. Approximately 70-80% of patients with PSC have underlying UC [1], [3]. * **Cholestatic Pattern:** Elevated alkaline phosphatase (ALP) with normal transaminases (SGOT/PT) indicates a cholestatic rather than a hepatocellular injury pattern [1]. * **Imaging:** While ultrasound is often normal in early stages (no gallstones), the definitive diagnosis is made via MRCP/ERCP showing the characteristic **"beaded appearance"** of bile ducts. Pruritus is a hallmark symptom of chronic cholestasis [1], [2]. **2. Why other options are incorrect:** * **Hodgkin’s Lymphoma:** While it can cause pruritus and jaundice (due to lymph node compression), it does not explain the chronic diarrhea (IBD link). * **Autoimmune Hepatitis:** This typically presents with significantly elevated transaminases (hepatitic pattern) rather than isolated ALP elevation, and is not classically associated with chronic diarrhea [4]. * **Viral Hepatitis:** This presents with acute or chronic elevation of SGOT/PT and would not typically cause years of diarrhea followed by isolated ALP elevation. **NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** MRCP (initial) or ERCP (confirmatory) showing multifocal strictures and focal dilations ("beading"). * **Antibody:** **p-ANCA** is positive in about 60-80% of cases (though not specific) [1], [3]. * **Malignancy Risk:** PSC significantly increases the risk of **Cholangiocarcinoma** and Colorectal Cancer. * **Biopsy:** May show pathognomonic **"Onion-skin fibrosis"** of the bile ducts.

Question 112: What is the treatment of choice for a patient with severe alcoholic hepatitis and a high discriminant function score?

A. Liver transplant
B. Colchicine
C. Steroids (Correct Answer)
D. Anti-TNF alpha agents

Explanation: **Explanation:** Severe alcoholic hepatitis (AH) is characterized by a high risk of short-term mortality. The treatment of choice is **Corticosteroids** (typically Prednisolone 40 mg/day for 28 days). **1. Why Steroids are the Correct Choice:** The decision to treat is based on the **Maddrey Discriminant Function (mDF)** score. A score **≥32** indicates severe AH and a high risk of death. [1] Steroids work by suppressing the profound pro-inflammatory cytokine cascade (TNF-̱, IL-1, IL-6) triggered by alcohol-induced liver injury. The **Lille Score** is subsequently used after 7 days of therapy to assess responsiveness; a score >0.45 suggests steroid non-response, and treatment should be discontinued. **2. Why Other Options are Incorrect:** * **Liver Transplant:** While it is the definitive treatment for end-stage liver disease, most centers require a **6-month period of abstinence** before listing. It is not the immediate first-line treatment for acute AH, though "early transplant" is an emerging concept for select non-responders. * **Colchicine:** It has anti-inflammatory properties but has shown **no survival benefit** in acute alcoholic hepatitis. * **Anti-TNF alpha agents (e.g., Infliximab):** Although TNF-̱ is central to the pathogenesis, clinical trials showed an **increased risk of fatal infections**, making them contraindicated in AH. **High-Yield Clinical Pearls for NEET-PG:** * **Pentoxifylline:** Previously used as an alternative to steroids (to prevent hepatorenal syndrome), but the **STOPAH trial** showed it does not improve survival. It is now only considered if steroids are strictly contraindicated (e.g., active sepsis, GI bleed). * **Nutrition:** Enteral nutrition is a critical adjunctive therapy in AH. * **Most common infection:** Spontaneous Bacterial Peritonitis (SBP) and Urinary Tract Infections (UTI) are common complications to watch for during steroid therapy.

Question 113: A patient presents with malena, hyperpigmentation over the lips, oral mucosa, and skin. His sister has similar complaints. What is the most likely diagnosis?

A. Peutz-Jeghers Syndrome (Correct Answer)
B. Familial Adenomatous Polyposis
C. Gardner's Syndrome
D. Villous Adenoma

Explanation: ### Explanation **Correct Answer: A. Peutz-Jeghers Syndrome (PJS)** The clinical triad of **melena** (indicating GI bleeding), **mucocutaneous hyperpigmentation**, and a **positive family history** is pathognomonic for Peutz-Jeghers Syndrome. * **Pathophysiology:** PJS is an autosomal dominant condition caused by a mutation in the **STK11 (LKB1)** gene on chromosome 19. * **Clinical Features:** It is characterized by multiple **hamartomatous polyps** throughout the gastrointestinal tract (most commonly in the small intestine) and distinctive melanin spots (lentigines) on the lips, buccal mucosa, and digits [2]. Melena occurs due to ulceration or intussusception of these polyps. --- ### Why the other options are incorrect: * **B. Familial Adenomatous Polyposis (FAP):** Characterized by thousands of adenomatous colonic polyps due to an **APC gene** mutation [1]. It lacks the characteristic mucocutaneous pigmentation and typically presents with hematochezia rather than small-bowel-related melena. * **C. Gardner’s Syndrome:** A variant of FAP. While it includes extra-intestinal manifestations, these are typically **osteomas, dental abnormalities, and soft tissue tumors** (desmoid tumors, sebaceous cysts) [1], not perioral pigmentation. * **D. Villous Adenoma:** A type of colonic polyp with high malignant potential. It often presents with secretory diarrhea and hypokalemia, but it is not associated with systemic hyperpigmentation or a strong familial inheritance pattern like PJS. --- ### High-Yield Clinical Pearls for NEET-PG: * **Polyp Type:** Hamartomatous (not premalignant themselves, but associated with high cancer risk) [2]. * **Most Common Site of Polyps:** Small Intestine (Jejunum > Ileum > Duodenum). * **Most Common Complication:** Intussusception (often "lead point" for bowel obstruction). * **Cancer Risk:** Significantly increased risk of GI (colorectal, pancreatic) and extra-GI cancers (breast, ovary, cervix, and Sertoli cell tumors of the testes) [2]. * **Gene:** STK11/LKB1 (Chromosome 19p13.3).

Question 114: Protein losing enteropathy is characterized by which of the following findings, except?

A. Decreased serum albumin and globulin
B. Normal lymphatic flow (Correct Answer)
C. 99mTc-dextran radionuclide study performed
D. Lymphangiectasia on biopsy

Explanation: **Protein-Losing Enteropathy (PLE)** is a clinical syndrome characterized by the excessive loss of serum proteins into the gastrointestinal tract, leading to hypoproteinemia and edema. ### **Explanation of the Correct Option** **Option B (Normal lymphatic flow)** is the correct answer because it is **incorrect** regarding PLE. One of the primary mechanisms of PLE is **lymphatic obstruction** or **intestinal lymphangiectasia**. When lymphatic flow is obstructed or the vessels are dilated (lymphangiectasia), the high-pressure lymph (rich in proteins and chylomicrons) leaks into the bowel lumen. Therefore, lymphatic flow is typically **abnormal or obstructed**, not normal. ### **Analysis of Other Options** * **Option A (Decreased serum albumin and globulin):** Unlike nephrotic syndrome (where globulins are often preserved due to their large size), PLE involves the non-selective loss of all serum proteins. This leads to **panhypoproteinemia** (low albumin AND low globulins). * **Option C (99mTc-dextran radionuclide study):** This is a valid diagnostic tool. Radionuclide imaging using **99mTc-labeled dextran** or **99mTc-albumin** can help localize the site of protein loss in the gut. * **Option D (Lymphangiectasia on biopsy):** Intestinal lymphangiectasia (dilation of mucosal lymphatics) is a classic histopathological finding in primary PLE (Waldmann’s disease) or secondary PLE due to cardiac issues (e.g., Fontan procedure). ### **NEET-PG High-Yield Pearls** * **Gold Standard Diagnosis:** The most reliable test to confirm PLE is the **24-hour fecal α1-antitrypsin clearance**. α1-antitrypsin is resistant to degradation by digestive enzymes, making it an ideal marker. * **Clinical Presentation:** Patients present with generalized edema (anasarca) and malnutrition, but **without** proteinuria or liver dysfunction. * **Key Associations:** PLE is associated with **Menetrier’s disease**, Celiac disease, Crohn’s disease, and **Constrictive Pericarditis** (due to increased central venous pressure affecting lymphatic drainage).

Question 115: What is the best treatment for irritable bowel syndrome with spastic colon?

A. Liquid paraffin
B. Senna
C. Bisacodyl
D. Dietary fibers (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Dietary fibers** **Concept:** Irritable Bowel Syndrome (IBS) with a "spastic colon" typically refers to the **IBS-C (Constipation-predominant)** subtype, characterized by abdominal pain and altered bowel habits [1]. **Dietary fiber** (especially soluble fiber like Psyllium/Ispaghula) is considered the first-line treatment. Fiber acts as a bulking agent that increases stool volume and softens consistency by retaining water [2]. This stretches the colonic wall, promoting regular peristalsis and reducing high-pressure segmental contractions (spasms), thereby alleviating both constipation and associated pain. **Why Incorrect Options are Wrong:** * **A. Liquid paraffin:** This is an emollient/lubricant laxative. While it softens stool, it is not recommended for long-term IBS management due to risks of lipid pneumonia (if aspirated) and interference with the absorption of fat-soluble vitamins (A, D, E, K). * **B. Senna & C. Bisacodyl:** These are **stimulant laxatives**. While effective for acute constipation, they can worsen abdominal cramping and "spastic" pain in IBS patients. Chronic use is generally discouraged as a first-line approach in IBS due to potential dependency and electrolyte imbalances. **High-Yield Clinical Pearls for NEET-PG:** * **First-line management for IBS:** Lifestyle modification, stress reduction, and fiber supplementation [1]. * **Soluble vs. Insoluble Fiber:** Soluble fiber (Psyllium) is preferred. Insoluble fiber (Bran) may actually worsen bloating and pain in some IBS patients. * **Antispasmodics:** For acute relief of "spastic" pain, drugs like **Dicyclomine** or **Hyoscyamine** (anticholinergics) are used. * **Rome IV Criteria:** The current gold standard for diagnosing IBS (recurrent abdominal pain ≥1 day/week in the last 3 months associated with ≥2 criteria: related to defecation, change in frequency, or change in form of stool) [1].

Question 116: What is the primary treatment for Zollinger-Ellison syndrome?

A. Cimetidine
B. Omeprazole (Correct Answer)
C. Misoprostol
D. Aluminium hydroxide

Explanation: **Explanation:** **Zollinger-Ellison Syndrome (ZES)** is characterized by a gastrin-secreting tumor (gastrinoma), typically located in the duodenum or pancreas. This leads to massive hypersecretion of gastric acid, resulting in refractory peptic ulcers and diarrhea. **Why Omeprazole is correct:** Proton Pump Inhibitors (PPIs) like **Omeprazole** are the **primary medical treatment** for ZES. They irreversibly inhibit the H+/K+ ATPase pump, the final common pathway of acid secretion. Because ZES involves extreme hypergastrinemia, high doses of PPIs are required to effectively control acid output, prevent complications (like perforation), and allow ulcers to heal. **Why other options are incorrect:** * **A. Cimetidine:** This is an H2-receptor antagonist. While it reduces acid, it is significantly less potent than PPIs. In ZES, the massive gastrin stimulus easily overcomes H2 blockade, making it ineffective for long-term management. * **C. Misoprostol:** A PGE1 analog used primarily to prevent NSAID-induced ulcers. It does not provide the profound acid suppression necessary to counteract a gastrinoma. * **D. Aluminium hydroxide:** An antacid that neutralizes existing gastric acid. It provides only transient symptomatic relief and has no role in the definitive management of hypersecretory states. **NEET-PG High-Yield Pearls:** * **Diagnosis:** Best initial test is **fasting serum gastrin** (>1000 pg/mL is diagnostic). The most sensitive provocative test is the **Secretin Stimulation Test** (paradoxical rise in gastrin). * **Localization:** The most sensitive imaging for locating the primary tumor is **Somatostatin Receptor Scintigraphy (SRS)** or Endoscopic Ultrasound (EUS). * **Association:** Approximately 25% of ZES cases are associated with **Multiple Endocrine Neoplasia Type 1 (MEN1)**. * **Passaro’s Triangle:** The anatomical area (junction of cystic/common duct, junction of 2nd/3rd part of duodenum, and neck of pancreas) where 90% of gastrinomas are found.

Question 117: A 40-year-old woman with a history of hyperparathyroidism presents with a 2-month history of burning epigastric pain, relieved by antacids or food. She also reports a recent history of tarry stools and denies taking aspirin or NSAIDs. Laboratory studies show a microcytic, hypochromic anemia. Gastroscopy reveals a bleeding mucosal defect in the antrum. Which of the following best characterizes the pathogenesis of epigastric pain in this patient?

A. Decreased calcium resorption by renal tubules
B. Decreased serum levels of parathyroid hormone (PTH)
C. Gastric nonresponsiveness to parathyroid hormone (PTH)
D. Increased secretion of gastrin (Correct Answer)

Explanation: The patient presents with symptoms of **Peptic Ulcer Disease (PUD)** (burning epigastric pain, melena, and microcytic anemia) in the setting of **primary hyperparathyroidism**. The underlying mechanism linking these two conditions is the effect of hypercalcemia on gastric acid secretion. **1. Why Option D is Correct:** In primary hyperparathyroidism, elevated serum calcium levels directly stimulate the G-cells in the gastric antrum to secrete **gastrin**. Gastrin, in turn, acts on parietal cells to increase hydrochloric acid production [1]. This hyperchlorhydria leads to mucosal injury and the formation of peptic ulcers. Additionally, this presentation should raise suspicion for **MEN 1 syndrome** (Wermer syndrome), where hyperparathyroidism coexists with pancreatic tumors (like Gastrinomas/Zollinger-Ellison Syndrome), further elevating gastrin levels [2]. **2. Why Other Options are Wrong:** * **Options A & B:** In primary hyperparathyroidism, there is typically *increased* calcium resorption (due to PTH action on kidneys) and *increased* serum PTH levels. These options describe the opposite of the patient's likely physiological state. * **Option C:** The stomach does not require "responsiveness" to PTH to develop ulcers; rather, it responds to the systemic **hypercalcemia** caused by the PTH. **3. NEET-PG High-Yield Pearls:** * **Hypercalcemia & Digestion:** "Stones, bones, abdominal moans, and psychic groans." The "abdominal moans" refer to PUD and pancreatitis, both triggered by high calcium. * **MEN 1 Syndrome (3 Ps):** **P**arathyroid hyperplasia (most common), **P**ancreatic islet cell tumors (e.g., Gastrinoma), and **P**ituitary adenoma. * **Diagnosis:** If a patient has recurrent or refractory ulcers, always check serum calcium and gastrin levels to rule out MEN 1 or Gastrinoma.

Question 118: Hereditary chronic pancreatitis is caused by mutation of which gene?

A. Cationic trypsinogen or PRSS1 (Correct Answer)
B. CFTR
C. PTSI
D. SPINK1

Explanation: ### Explanation **Hereditary Chronic Pancreatitis (HCP)** is an autosomal dominant condition characterized by recurrent episodes of acute pancreatitis starting in childhood, often progressing to chronic pancreatitis and a significantly increased risk of pancreatic adenocarcinoma. **1. Why PRSS1 is Correct:** The most common cause of HCP is a "gain-of-function" mutation in the **PRSS1 gene** (located on chromosome 7), which encodes **Cationic Trypsinogen**. Under normal physiological conditions, if trypsinogen is prematurely activated to trypsin within the pancreas, it is quickly inactivated by protective mechanisms [1]. Mutations in PRSS1 make the trypsin molecule resistant to self-degradation (autolysis). This leads to sustained intrapancreatic trypsin activity, causing autodigestion of the pancreatic parenchyma and subsequent chronic inflammation [1]. **2. Analysis of Incorrect Options:** * **CFTR (Cystic Fibrosis Transmembrane Conductance Regulator):** Mutations here cause Cystic Fibrosis. While CFTR mutations are associated with "idiopathic" chronic pancreatitis due to thick secretions obstructing ducts, they are not the primary cause of *Hereditary* Chronic Pancreatitis. * **SPINK1 (Serine Protease Inhibitor Kazal-type 1):** This gene encodes a protein that acts as a "brake" by inhibiting small amounts of prematurely activated trypsin. Mutations in SPINK1 are "loss-of-function" and lower the threshold for pancreatitis, but they are typically associated with **Tropical Pancreatitis** or idiopathic cases rather than classical HCP. * **PTSI:** This is a distractor and not a recognized gene associated with hereditary pancreatitis. **3. NEET-PG High-Yield Pearls:** * **Inheritance:** PRSS1 mutations follow an **Autosomal Dominant** pattern with high penetrance (approx. 80%). * **Cancer Risk:** Patients with HCP have a **50-fold increased risk** of pancreatic cancer. * **Mnemonic:** **P**RSS1 = **P**ancreatitis (Hereditary) / **P**remature activation. * **Other Genes:** CTRC (Chymotrypsin C) and CASR (Calcium-sensing receptor) are also linked to chronic pancreatitis risk but are less frequently tested than PRSS1 and SPINK1.

Question 119: What is the most common cause for Budd-Chiari syndrome?

A. Right ventricular failure
B. Paroxysmal nocturnal hemoglobinuria (PNH)
C. Thrombosis in hepatic veins
D. Polycythemia vera (Correct Answer)

Explanation: **Explanation:** **Budd-Chiari Syndrome (BCS)** is defined as the obstruction of hepatic venous outflow at any level from the small hepatic veins to the junction of the inferior vena cava (IVC) with the right atrium. **Why Polycythemia Vera (PV) is the correct answer:** The primary underlying mechanism of BCS is a hypercoagulable state. **Polycythemia Vera**, a myeloproliferative neoplasm, is the **most common specific cause** (etiology) of BCS, accounting for nearly 10–40% of cases. The increased red cell mass and associated JAK2 mutations significantly increase the risk of venous thrombosis in the hepatic vasculature. **Analysis of Incorrect Options:** * **A. Right ventricular failure:** While this causes hepatic congestion (congestive hepatopathy or "nutmeg liver"), it is technically excluded from the definition of BCS, which requires the obstruction to be intra-hepatic or in the IVC, not the heart [1]. * **B. Paroxysmal nocturnal hemoglobinuria (PNH):** PNH is a very strong risk factor for BCS and has the highest *relative* risk, but it is less common in the general population than PV, making it a less frequent cause overall. * **C. Thrombosis in hepatic veins:** This is the **pathological process** (the "what"), but the question asks for the **cause** (the "why"). Thrombosis is the result of an underlying condition like PV. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Abdominal pain, ascites, and hepatomegaly. * **Most common cause worldwide:** Myeloproliferative disorders (PV being the leader). * **Most common cause in Asia/India:** Membranous webs of the Inferior Vena Cava (IVC). * **Imaging of choice:** Doppler Ultrasound (shows "spiderweb" collateral vessels). * **Gold Standard:** Venography. * **Biopsy finding:** Centrilobular congestion and necrosis (Zone 3).

Question 120: All of the following are causes of acute pancreatitis except?

A. Gall stones
B. Alcohol
C. Hemochromatosis (Correct Answer)
D. Hypercalcemia

Explanation: Explanation: Acute pancreatitis is an inflammatory condition of the pancreas characterized by the premature activation of digestive enzymes [1]. Why Hemochromatosis is the correct answer: Hemochromatosis is a condition of iron overload where iron deposits (hemosiderin) accumulate in the parenchymal cells of various organs. In the pancreas, iron deposition primarily affects the Islets of Langerhans (endocrine pancreas), leading to Diabetes Mellitus (often called "Bronze Diabetes"). While it causes chronic structural damage and fibrosis (Chronic Pancreatitis), it is not a recognized cause of an acute inflammatory episode (Acute Pancreatitis). Analysis of other options: * Gallstones (Option A): The most common cause of acute pancreatitis worldwide (approx. 40%) [1]. Obstruction of the ampulla of Vater leads to backflow of bile and pancreatic juice, triggering enzyme activation. * Alcohol (Option B): The second most common cause [1]. Ethanol exerts a direct toxic effect on acinar cells and increases the protein content of pancreatic secretions, leading to ductal plugging. * Hypercalcemia (Option D): Elevated calcium levels (e.g., due to Hyperparathyroidism) can lead to the activation of trypsinogen to trypsin within the pancreatic parenchyma and can also form calcium stones in the pancreatic duct. High-Yield Clinical Pearls for NEET-PG: * Mnemonic for Causes: "I GET SMASHED" (Idiopathic, Gallstones, Ethanol, Trauma, Steroids, Mumps, Autoimmune, Scorpion sting, Hypertriglyceridemia/Hypercalcemia, ERCP, Drugs) [1]. * Hypertriglyceridemia: Only causes pancreatitis when levels exceed >1000 mg/dL. * Drug-induced: Common culprits include Azathioprine, Sulfonamides, Valproate, and Thiazides. * Scorpion Sting: Specifically the Tityus trinitatis species.

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)

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Gastrointestinal Bleeding

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Liver Diseases and Cirrhosis

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Viral Hepatitis

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Biliary Tract Disorders

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Gastrointestinal Motility Disorders

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Gastrointestinal Malignancies

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