Gastroenterology Practice Questions

Q: A lady presents with melanotic pigmentation of the lips, multiple polyps in the intestine, and a positive family history. What is the most probable diagnosis?

Peutz-Jegher's Syndrome. The clinical triad of **mucocutaneous pigmentation**, **multiple intestinal polyps**, and a **positive family history** is the hallmark of **Peutz-Jeghers Syndrome (PJS)**. 1. **Why Peutz-Jeghers Syndrome is correct:** * **Pigmentation:** Characteristically presents as melanotic macules on the lips, buccal mucosa, and digits. * **Polyps:** These are typically **Hamartomatous** polyps, most commonly found in the small intestine (jejunum) [2]. * **Genetics:** It is an autosomal dominant condition associated with a mutation in the **STK11 (LKB1)** gene on chromosome 19. 2. **Why other options are incorrect:** * **Gardner’s Syndrome:** A variant of Familial Adenomatous Polyposis (FAP). While it involves intestinal polyps, it is characterized by extra-intestinal manifestations like osteomas, epidermal cysts, and desmoid tumors, not melanotic lip pigmentation [1]. * **Turcot’s Syndrome:** Characterized by the association of colonic polyposis with **Central Nervous System (CNS) tumors** (e.g., Medulloblastoma or Glioblastoma). * **Lynch Syndrome (HNPCC):** An autosomal dominant condition due to DNA mismatch repair (MMR) gene mutations. It leads to colorectal cancer without extensive pre-existing polyposis and lacks mucocutaneous pigmentation. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of polyps in PJS:** Small Intestine (Jejunum > Ileum > Duodenum). * **Most common complication:** Intussusception (the polyps act as lead points). * **Cancer Risk:** PJS patients have a significantly increased risk of both GI and extra-GI malignancies (Breast, Pancreas, Ovary, and Sertoli cell tumors of the testis) [2]. * **Histology:** PJS polyps show a characteristic **"arborizing" pattern** of smooth muscle fibers.

Q: What is the most common cause of gastrointestinal bleeding?

Duodenal ulcer. **Explanation:** **1. Why Duodenal Ulcer is Correct:** Peptic Ulcer Disease (PUD) is the most common cause of upper gastrointestinal bleeding (UGIB) worldwide, accounting for approximately 50% of cases [1]. Within PUD, **Duodenal Ulcers (DU)** are significantly more common than gastric ulcers [2]. Bleeding typically occurs when the ulcer erodes into a vessel, most commonly the **gastroduodenal artery** (located behind the first part of the duodenum) [1]. **2. Analysis of Incorrect Options:** * **Gastric Cancer:** While a significant cause of chronic occult blood loss and anemia, it is a relatively uncommon cause of acute, massive GI bleeding compared to PUD. * **Esophageal Varices:** This is the most common cause of *massive* or *life-threatening* UGIB in patients with portal hypertension (cirrhosis), but it is not the most common cause in the general population [1]. * **Erosive Gastritis:** Often caused by NSAIDs or alcohol, this is a frequent cause of UGIB but ranks behind PUD in overall prevalence [1]. **3. NEET-PG High-Yield Pearls:** * **Most common cause of UGIB:** Duodenal Ulcer. * **Most common cause of Lower GI Bleeding:** Diverticulosis (in adults) and Meckel’s Diverticulum (in children). * **Rockall Score & Glasgow-Blatchford Score:** These are high-yield clinical scoring systems used to risk-stratify patients with UGIB [1]. * **Dieulafoy’s Lesion:** A rare but classic "exam favorite" cause of UGIB involving a large submucosal artery that bleeds through a tiny mucosal defect, usually in the lesser curvature of the stomach.

Q: Which of the following conditions is NOT typically associated with the formation of a small intestinal stricture?

Typhoid fever. The formation of a small intestinal stricture depends on the nature of the inflammatory or neoplastic process. **Typhoid fever (Enteric fever)**, caused by *Salmonella typhi*, primarily affects the Peyer’s patches in the terminal ileum. The characteristic pathology involves longitudinal ulceration. Because these ulcers are longitudinal (parallel to the long axis of the gut) and heal without significant fibrosis or circumferential scarring, they **do not result in stricture formation**. Instead, the most feared complications of typhoid ulcers are perforation and hemorrhage. **Analysis of other options:** * **Tuberculosis (TB):** Intestinal TB is the most common cause of benign small bowel strictures in developing countries. The ulcers are typically **transverse** (circumferential), leading to significant fibrosis and "napkin-ring" narrowing during healing. * **Malignant Tumors (e.g., Adenocarcinoma):** These lesions grow circumferentially and infiltrate the bowel wall, leading to progressive luminal narrowing and "apple-core" appearances. * **Lymphoma:** While primary intestinal lymphoma often causes aneurysmal dilatation of the bowel wall, it can also present with obstructive symptoms due to bulky masses or associated desmoplastic reactions that lead to strictures [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Typhoid Ulcers:** Longitudinal, along the long axis; lead to **perforation**, not strictures. * **Tubercular Ulcers:** Transverse/Circumferential; lead to **strictures**, not usually perforation. * **Crohn’s Disease:** Characterized by transmural inflammation and "string sign of Kantor" due to terminal ileal strictures. * **Aneurysmal Dilatation:** Classically associated with **Small Bowel Lymphoma** due to destruction of the myenteric plexus.

Q: Which of the following is NOT typically seen in cirrhosis of the liver?

Enlargement of the testis. In cirrhosis of the liver, the primary hormonal derangement is **hyperestrogenism** (excess estrogen) and **hypogonadism** (decreased testosterone). This occurs because the damaged liver cannot effectively clear androstenedione, which is then peripherally converted into estrogen by aromatase. **Why "Enlargement of the testis" is the correct answer:** Hyperestrogenism exerts negative feedback on the hypothalamus and pituitary gland, leading to decreased secretion of FSH and LH [1]. This results in **testicular atrophy** (shrinkage), not enlargement [1]. Therefore, enlargement of the testis is not a feature of cirrhosis. **Why the other options are incorrect:** * **Gynaecomastia:** Increased estrogen levels stimulate breast tissue proliferation in males, a classic sign of chronic liver disease [1], [2]. * **Absence of pubic and facial hair:** High estrogen levels and low testosterone lead to a "feminizing" effect, resulting in the loss of secondary male sexual characteristics, including thinning or loss of axillary, pubic, and facial hair [1]. * **Loss of libido:** This is a direct consequence of low serum testosterone levels (hypogonadism) associated with liver failure [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Spider Angiomata & Palmar Erythema:** These are also caused by hyperestrogenism due to its vasodilatory effects [1]. * **Feminization in Cirrhosis:** The combination of gynaecomastia, testicular atrophy, and loss of male hair distribution is collectively termed "feminization" [1]. * **Spironolactone:** This diuretic, often used to treat ascites in cirrhosis, can further worsen gynaecomastia due to its anti-androgenic properties.

Q: Pseudochylous ascites is most commonly associated with which of the following conditions?

Malignant ascites. Explanation: Pseudochylous ascites is defined by a milky appearance of the ascitic fluid that mimics chyle but lacks a high triglyceride content. The milky turbidity is instead caused by cellular degeneration and the presence of lecithin-globulin complexes (phospholipids) derived from the breakdown of tumor cells or inflammatory cells. 1. Why Malignant Ascites is Correct: Malignancy is the most common cause of pseudochylous ascites. In advanced cancers, rapid cell turnover and necrosis lead to the release of intracellular lipids and proteins into the peritoneal cavity [1]. Unlike true chylous ascites (caused by lymphatic obstruction), pseudochylous ascites has low triglyceride levels (usually <200 mg/dL) and does not clear upon adding ether. 2. Analysis of Incorrect Options: * Cirrhosis: Typically presents with transudative, clear, or straw-colored fluid. While cirrhosis can occasionally cause chylous ascites (due to high lymph flow), it is not the primary cause of pseudochylous fluid. * Hyperlipidemia: While systemic hyperlipidemia can affect serum appearance, it does not directly cause the accumulation of milky ascitic fluid unless there is a secondary mechanism of leakage or exudation. * Filariasis: This is a classic cause of True Chylous Ascites. It occurs due to the physical obstruction of lymphatic vessels by parasites, leading to the leakage of triglyceride-rich chyle into the peritoneum. 3. NEET-PG High-Yield Pearls: * True Chylous Ascites: High Triglycerides (>200 mg/dL), presence of chylomicrons, clears with ether. Most common causes: Lymphoma (adults) and congenital lymphatic malformations (children). * Pseudochylous Ascites: Low Triglycerides, high cholesterol/phospholipids, does not clear with ether. Most common cause: Malignancy or chronic inflammation (e.g., Tuberculosis). * Chyliform Ascites: A rare term sometimes used for fluid with high lecithin-globulin complexes, often used interchangeably with pseudochylous.

Q: Ulcerative colitis typically starts in which part of the colon?

Rectum. **Explanation:** **Ulcerative Colitis (UC)** is a chronic inflammatory bowel disease characterized by diffuse, mucosal inflammation. The hallmark of UC is that it **always involves the rectum** (proctitis) and extends proximally in a **continuous, symmetrical fashion** without skip lesions [1]. Therefore, the rectum is the starting point in the vast majority of cases. **Analysis of Options:** * **D. Rectum (Correct):** In 95% of cases, the disease originates here [1]. It may remain localized to the rectum or spread to involve the entire colon (pancolitis). * **A & B. Descending/Transverse Colon:** While these areas are frequently involved, they are affected as a result of proximal progression from the rectum. They are not the typical site of origin. * **C. Caecum:** Involvement of the caecum usually occurs only in extensive disease. **High-Yield Clinical Pearls for NEET-PG:** * **Continuous Involvement:** Unlike Crohn’s disease (which has "skip lesions"), UC is continuous [1]. * **Depth of Inflammation:** UC is limited to the **mucosa and submucosa**, whereas Crohn’s is transmural [1]. * **Lead Pipe Appearance:** Chronic UC leads to loss of haustrations, seen on barium enema. * **Backwash Ileitis:** In cases of pancolitis, the terminal ileum may show superficial inflammation. * **Smoking Paradox:** Smoking is actually protective in UC. * **Surgery:** Proctocolectomy is curative for UC [2].

Q: A young patient presents with jaundice. Total bilirubin is 21 mg/dL, direct bilirubin is 9.6 mg/dL, and alkaline phosphatase is 84 King-Armstrong units. What is the most likely diagnosis?

Obstructive jaundice. ### Explanation The clinical presentation and laboratory findings point towards **Obstructive (Post-hepatic) Jaundice**. **1. Why Obstructive Jaundice is Correct:** * **Conjugated Hyperbilirubinemia:** The total bilirubin is 21 mg/dL, and the direct (conjugated) bilirubin is 9.6 mg/dL. In obstructive jaundice, direct bilirubin typically accounts for more than 50% of the total bilirubin due to the back-leakage of conjugated bile into the bloodstream [2]. * **Markedly Elevated Alkaline Phosphatase (ALP):** The ALP is 84 King-Armstrong (KA) units. The normal range for ALP is 3–13 KA units. An elevation of more than 3–4 times the upper limit of normal is a classic hallmark of cholestasis or biliary obstruction [1]. **2. Why the Other Options are Incorrect:** * **A. Hemolytic Jaundice:** Characterized by **unconjugated (indirect) hyperbilirubinemia**. Total bilirubin rarely exceeds 5 mg/dL, and ALP levels remain normal [2]. * **B & C. Viral/Chronic Active Hepatitis:** These are hepatocellular causes of jaundice [1]. While they can cause conjugated hyperbilirubinemia, the primary laboratory feature is a massive rise in transaminases (AST/ALT) [1]. ALP may be elevated but usually less than 2–3 times the normal limit. **3. NEET-PG High-Yield Pearls:** * **Bilirubin Levels:** In surgical/obstructive jaundice (e.g., carcinoma head of pancreas), bilirubin can reach very high levels (up to 20–30 mg/dL), whereas in hemolysis, it stays low. * **Enzyme Ratios:** A high **ALP-to-ALT ratio** suggests obstruction, while a high **ALT-to-ALP ratio** suggests hepatocellular damage [1]. * **Courvoisier’s Law:** In a patient with obstructive jaundice, if the gallbladder is palpable, the obstruction is likely due to a malignancy (e.g., periampullary carcinoma) rather than gallstones.

Q: Which drug is used for achalasia cardia?

Nifedipine. Achalasia Cardia is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis [1]. The primary goal of pharmacological therapy is to reduce the resting LES pressure to facilitate the passage of food. Why Nifedipine is correct: Nifedipine is a Calcium Channel Blocker (CCB). Calcium is essential for smooth muscle contraction; by blocking calcium influx into the smooth muscle cells of the LES, Nifedipine promotes smooth muscle relaxation [3]. It is typically administered sublingually 15–30 minutes before meals. While definitive treatments include pneumatic dilation or Myotomy (Heller’s), CCBs are used as temporizing measures or in patients who are poor surgical candidates [4]. Why other options are incorrect: * Propranolol & Atenolol: These are Beta-blockers. They primarily affect heart rate and blood pressure [3]. They have no significant effect on relaxing the smooth muscles of the esophagus and are not indicated for motility disorders. * Bethanechol: This is a cholinergic agonist (parasympathomimetic). It actually increases the tone of the LES and stimulates GI motility, which would worsen the symptoms of achalasia. Clinical Pearls for NEET-PG: * Drug of Choice (Medical): Nitrates (e.g., Isosorbide dinitrate) and CCBs (Nifedipine) are the most common oral agents [2]. * Gold Standard Diagnosis: Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * Barium Swallow Finding: "Bird’s Beak" appearance [1]. * Botulinum Toxin: Can be injected endoscopically into the LES to inhibit acetylcholine release, causing relaxation (used in elderly/high-risk patients) [4].

Question 1

A lady presents with melanotic pigmentation of the lips, multiple polyps in the intestine, and a positive family history. What is the most probable diagnosis?

Accepted Answer

Peutz-Jegher's Syndrome

Answer

Gardner's syndrome

Answer

Turcot's syndrome

Answer

Lynch syndrome

Question 2

Which of the following findings does not occur in a patient with gastrinoma?

Accepted Answer

Basal acid output (BAO) less than 15 mEq/litre

Answer

Epigastric pain

Answer

Diarrhoea

Answer

Serum gastrin levels >200 pg/ml

Question 3

What is the most common cause of gastrointestinal bleeding?

Accepted Answer

Duodenal ulcer

Answer

Gastric cancer

Answer

Esophageal varices

Answer

Erosive gastritis

Question 4

Which of the following conditions is NOT typically associated with the formation of a small intestinal stricture?

Accepted Answer

Typhoid fever

Answer

Lymphoma

Answer

Malignant tumor

Answer

Tuberculosis

Question 5

Which of the following is NOT typically seen in cirrhosis of the liver?

Accepted Answer

Enlargement of the testis

Answer

Gynaecomastia

Answer

Absence of pubic and facial hair

Answer

Loss of libido

Question 6

Pseudochylous ascites is most commonly associated with which of the following conditions?

Accepted Answer

Malignant ascites

Answer

Cirrhosis

Answer

Hyperlipidemia

Answer

Filariasis

Question 7

Chronic calcific pancreatitis is associated with all of the following except?

Accepted Answer

Hypercalcemia

Answer

Diabetes mellitus

Answer

Malabsorption of fat

Answer

Diabetes associated complications are uncommon

Question 8

Ulcerative colitis typically starts in which part of the colon?

Accepted Answer

Rectum

Answer

Descending colon

Answer

Transverse colon

Answer

Caecum

Question 9

A young patient presents with jaundice. Total bilirubin is 21 mg/dL, direct bilirubin is 9.6 mg/dL, and alkaline phosphatase is 84 King-Armstrong units. What is the most likely diagnosis?

Accepted Answer

Obstructive jaundice

Answer

Hemolytic jaundice

Answer

Viral hepatitis

Answer

Chronic active hepatitis

Question 10

Which drug is used for achalasia cardia?

Accepted Answer

Nifedipine

Answer

Propranolol

Answer

Atenolol

Answer

Bethnecol

Gastroenterology — MCQs

Gastroenterology — MCQs

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