Gastroenterology Practice Questions

Q: A patient presents with a history of mild diarrhea, blood in stools, and multiple fistulas. What is the most probable diagnosis?

Crohn's disease. ### Explanation The clinical presentation of chronic diarrhea, hematochezia, and **multiple fistulas** is a classic hallmark of **Crohn’s Disease** [1]. **1. Why Crohn’s Disease is Correct:** Crohn’s disease is a chronic inflammatory bowel disease (IBD) characterized by **transmural inflammation** (involving all layers of the bowel wall). This deep inflammation leads to the formation of sinus tracts that penetrate through the serosa into adjacent organs or the skin, resulting in **fistulas** (perianal, entero-enteric, or entero-vesical) [1]. While blood in stools is more common in Ulcerative Colitis, it frequently occurs in Crohn’s when the colon is involved [1]. **2. Why Other Options are Incorrect:** * **Ulcerative Colitis:** Inflammation is limited to the **mucosa and submucosa**. Because it does not involve the full thickness of the wall, fistula formation is extremely rare [1]. * **Intestinal Tuberculosis:** While it can mimic Crohn’s (especially the ileocecal involvement), it typically presents with constitutional symptoms like night sweats and fever. While fistulas can occur, they are significantly less common than in Crohn’s. * **Typhoid:** This is an acute febrile illness presenting with "pea-soup" diarrhea, rose spots, and potential intestinal perforation, but it does not cause chronic fistula formation. **3. NEET-PG High-Yield Pearls:** * **Pathology:** Look for **"Skip lesions"** and **non-caseating granulomas** (seen in 40-60% of cases). * **Endoscopy:** Characterized by a **"Cobblestone appearance"** [1] and "Creeping fat" (mesenteric fat wrapping around the bowel). * **Radiology:** The **"String sign of Kantor"** (terminal ileum narrowing) is a classic finding on barium studies [1]. * **Smoking:** Smoking is a risk factor for Crohn’s disease but is protective against Ulcerative Colitis.

Q: Oral examination is indicated in which of the following conditions?

Peutz-Jeghers syndrome. Oral examination is a critical diagnostic step in identifying **Peutz-Jeghers Syndrome (PJS)**. PJS is an autosomal dominant disorder characterized by the mutation of the **STK11 (LKB1)** gene. It is clinically defined by the triad of mucocutaneous pigmentation, gastrointestinal hamartomatous polyps [1], and an increased risk of visceral malignancies. 1. **Why Peutz-Jeghers Syndrome is correct:** The hallmark clinical sign is **melanotic macules** (hyperpigmented spots) found on the lips, buccal mucosa, and perioral area. These spots are often the first clue to diagnosis, appearing in childhood and sometimes fading after puberty, though buccal mucosa lesions usually persist. 2. **Why other options are incorrect:** * **Psoriasis:** Primarily a skin condition (extensor surfaces) and nail disorder; while oral psoriasis exists, it is extremely rare and not a standard indication for oral screening. * **Beri-beri:** Caused by Thiamine (B1) deficiency, it presents with cardiovascular (Wet) or neurological (Dry) symptoms. Oral signs are not characteristic (unlike B2 or B3 deficiencies). * **Plummer-Vinson Syndrome:** While it involves the oral cavity (glossitis), the definitive diagnostic step is an **esophagoscopy or barium swallow** to identify esophageal webs, rather than a simple oral inspection for diagnosis. **NEET-PG High-Yield Pearls:** * **PJS Polyps:** These are **hamartomatous**, most commonly found in the **small intestine** (jejunum) [1]. * **Complications:** The most common complication is **intussusception**. * **Cancer Risk:** Patients have a significantly high lifetime risk of colorectal, pancreatic, breast, and ovarian cancers [1]. * **Mnemonic:** "P" for Pigmentation, "P" for Polyps, "P" for STK11 (on chromosome 19**p**).

Q: Which of the following is not a marker of the active replicative phase of chronic hepatitis B?

Anti-HBc. ### Explanation The active replicative phase of Chronic Hepatitis B is characterized by high viral load, active viral assembly, and ongoing liver injury. To identify this phase, we look for markers of the virus itself or the damage it causes. [1] **Why Anti-HBc is the Correct Answer:** **Anti-HBc (Antibody to Hepatitis B core antigen)** is a marker of **exposure**, not replication. [2] * **IgM anti-HBc** indicates acute infection or a flare. * **IgG anti-HBc** indicates past or chronic infection and persists for life. [2] Because it remains positive regardless of whether the virus is actively replicating or in a dormant (inactive carrier) state, it is not a specific marker for the replicative phase. **Analysis of Incorrect Options:** * **HBV DNA:** This is the most sensitive and quantitative marker of viral replication. High levels (>2,000 IU/mL) signify active replication. [1] * **HBV DNA Polymerase:** This enzyme is required for viral synthesis. Its presence directly correlates with the production of new viral particles. * **AST & ALT:** These aminotransferases are markers of hepatocellular injury. In the replicative phase (specifically the "Immune Clearance" phase), the immune system attacks infected hepatocytes, leading to elevated AST and ALT. **NEET-PG High-Yield Pearls:** 1. **HBeAg:** The classic serological marker for high infectivity and active replication. 2. **Window Period:** The interval where HBsAg and Anti-HBs are both negative; **IgM Anti-HBc** is the only positive marker here. [1] 3. **Inactive Carrier State:** Characterized by HBeAg negative, Anti-HBe positive, low HBV DNA (<2,000 IU/mL), and normal ALT. [2] 4. **Ground Glass Hepatocytes:** Histological hallmark of chronic HBV infection due to HBsAg accumulation in the endoplasmic reticulum.

Q: A 85-year-old man presents with severe crampy abdominal pain which is worse after eating, associated with frequent nausea, bloating and watery diarrhoea. His other medical problems include coronary artery disease, hypertension, hypercholesterolemia. He has a 40-pack-year smoking history. Barium enema is as shown. What is the most probable cause?

Atherosclerosis of the mesenteric arteries. ***Atherosclerosis of the mesenteric arteries*** - Classic presentation of **intestinal angina** with post-prandial crampy pain, nausea, and diarrhea in an elderly patient with multiple cardiovascular risk factors (smoking, CAD, hypertension). - Barium enema likely shows **thumbprinting pattern** characteristic of **ischemic colitis**, caused by compromised mesenteric blood flow from atherosclerotic narrowing. *Left ventricular aneurysm* - This is a **cardiac complication** that doesn't directly cause gastrointestinal symptoms or bowel ischemia. - Would present with **heart failure symptoms** like dyspnea and chest pain, not abdominal pain and diarrhea. *Transmural inflammation of the small intestine* - Describes **Crohn's disease**, which typically presents in **younger patients** with chronic symptoms and **skip lesions**. - Would show **cobblestone appearance** and strictures on imaging, not the thumbprinting pattern of ischemic colitis. *Progressive pancreatic inflammation* - Refers to **chronic pancreatitis**, which causes **epigastric pain** radiating to the back and **steatorrhea**. - Would show **pancreatic calcifications** and ductal changes on imaging, not colonic thumbprinting on barium enema.

Q: A 60-year-old man with a known history of hemochromatosis, cirrhosis, and portal hypertension presented to the emergency department with altered mental status. The patient's attendant reported that over the last three days, the patient has become confused. There is no history of melena or hematemesis. For chronic ascites, diet control and spironolactone are being administered regularly. In the past, the patient experienced an episode of variceal bleeding for which he was prescribed propranolol, and no further episodes have occurred. On examination, the patient is not well-oriented to time and place but is oriented to person. He is afebrile, and his vital signs are stable; however, ascites and asterixis are notable. Laboratory investigations show a hemoglobin of 10.1 g/dL, creatinine of 1.4 mg/dL, and blood urea nitrogen of 45 mg/dL. Paracentesis revealed clear fluid with 800 WBC (40% neutrophils). Which statement regarding this condition is false?

Ascites is often preceded by infection.. The patient presents with cirrhosis, altered mental status (confusion), asterixis, and paracentesis showing an absolute neutrophil count (ANC) of 320 cells/mm³ (40% of 800). An ANC >250 cells/mm³ is diagnostic of **Spontaneous Bacterial Peritonitis (SBP)**. **1. Why Option A is the Correct (False) Statement:** The statement "Ascites is often preceded by infection" is incorrect because the pathophysiology is reversed. **Ascites precedes the infection.** SBP occurs when pre-existing ascitic fluid becomes infected, usually via transmigration of gut bacteria or hematogenous spread. Ascites itself is caused by portal hypertension and hypoalbuminemia, not by the infection [1]. **2. Analysis of Other Options:** * **Option B:** SBP can be clinically silent, but classic features include fever, abdominal pain/tenderness, and worsening hepatic encephalopathy (altered mental status) [2]. * **Option C:** Low ascitic fluid protein (** 250 cells/mm³ is the gold standard. * **Treatment:** Third-generation cephalosporins (e.g., **Cefotaxime**) are the drugs of choice. * **Albumin Therapy:** Administering IV albumin (1.5g/kg on day 1; 1g/kg on day 3) reduces the risk of hepatorenal syndrome and mortality. * **Prophylaxis:** Patients with ascitic protein <1.5 g/dL or a prior episode of SBP should receive long-term prophylaxis with Norfloxacin or Rifaximin.

Q: All of the following are used in the treatment of acute pancreatitis EXCEPT?

Antibiotics. The management of acute pancreatitis (AP) has shifted toward conservative, supportive care. The correct answer is **Antibiotics** because current guidelines (IAP/APA) recommend against their routine prophylactic use in AP, regardless of severity or the presence of sterile necrosis. ### **Explanation of Options:** * **Antibiotics (Correct Answer):** Acute pancreatitis is primarily a chemical inflammation, not a bacterial infection. Prophylactic antibiotics do not reduce the risk of infected necrosis or mortality. They are indicated **only** if there is evidence of infection (e.g., infected necrosis, cholangitis, or extra-pancreatic infections like UTI/pneumonia). * **IV Fluids:** Aggressive fluid resuscitation (preferably Ringer’s Lactate) is the cornerstone of early management to maintain pancreatic perfusion and prevent "walled-off" necrosis and organ failure. * **Analgesics:** Pain management is vital. While NSAIDs are avoided due to renal risks, opioids (like Buprenorphine or Fentanyl) are commonly used. *Note: The old teaching that Morphine causes Sphincter of Oddi spasm is clinically insignificant.* * **Nasojejunal (NJ) Feeds:** Early enteral nutrition (within 24–72 hours) is preferred over parenteral nutrition. NJ feeds help maintain the gut mucosal barrier, preventing bacterial translocation and subsequent infection of necrotic tissue. ### **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice for Pain:** Traditionally Pethidine (due to less Sphincter of Oddi spasm), but modern practice favors multimodal analgesia. * **Nutrition:** "Enteral is better than Parenteral." If the patient tolerates it, oral feeding is started; if not, NJ tube feeding is the gold standard for severe cases. * **Antibiotic Choice:** If infection is proven, **Carbapenems** (e.g., Imipenem) are preferred due to high pancreatic tissue penetration. * **Most common cause:** Gallstones (1st), Alcohol (2nd).

Q: A 40-year-old male with a history of jaundice and ascites is a known alcoholic. Which of the following statements is true regarding his condition?

Decreased liver span. **Explanation:** The clinical presentation of jaundice, ascites, and a history of chronic alcohol abuse in a 40-year-old male strongly suggests **Alcoholic Liver Cirrhosis** [1]. **Why the correct answer is right:** In the late stages of cirrhosis, chronic inflammation and progressive fibrosis lead to the replacement of healthy parenchyma with regenerative nodules [1] and scar tissue. This process causes the liver to shrink and become firm/nodular. Therefore, a **decreased liver span** (typically 2** [1]. This occurs because alcohol induces mitochondrial AST and alcoholics are often deficient in pyridoxal-5-phosphate (Vitamin B6), which is required for ALT synthesis. * **B. Polymorphonuclear count > 5500/L:** While leukocytosis can occur in acute alcoholic hepatitis, a PMN count > 5500/L is not a standard diagnostic criterion for cirrhosis. However, in the context of ascites [2], a PMN count **> 250 cells/mm³** in ascitic fluid is diagnostic of Spontaneous Bacterial Peritonitis (SBP). * **C. Increased serum LDH:** LDH is a non-specific marker of cell turnover. While it may be elevated in ischemic hepatitis or malignancy, it is not a characteristic or diagnostic feature used to define alcoholic cirrhosis. **High-Yield Clinical Pearls for NEET-PG:** * **Maddrey’s Discriminant Function (DF):** Used to assess the severity of alcoholic hepatitis; a score > 32 indicates severe disease and warrants corticosteroid therapy. * **Zieve’s Syndrome:** A triad of hemolytic anemia, hyperlipidemia, and jaundice seen in alcoholic liver disease. * **First sign of Cirrhosis on Ultrasound:** Coarse echotexture and surface nodularity. * **Most common cause of death in Cirrhosis:** Variceal bleeding.

Q: A 39-year-old female presents with chronic abdominal cramps, watery diarrhea, and periodic facial flushing. Examination reveals wheezing and a slightly enlarged liver. Workup reveals several masses within the liver and a large mass in the small intestine. Which of the following substances is likely to be elevated in her urine?

5-HIAA. The clinical presentation of chronic diarrhea, facial flushing, wheezing (bronchospasm), and a small intestinal mass with liver metastasis is classic for **Carcinoid Syndrome**. [1] **1. Why 5-HIAA is correct:** Carcinoid tumors are neuroendocrine tumors, most commonly arising from the enterochromaffin cells of the midgut (small intestine). [2] These cells secrete excessive amounts of **Serotonin (5-HT)**. Under normal conditions, serotonin is metabolized by the liver. However, when the tumor metastasizes to the liver, serotonin reaches the systemic circulation directly, bypassing hepatic metabolism. [1] Serotonin is eventually broken down by monoamine oxidase into **5-hydroxyindoleacetic acid (5-HIAA)**, which is excreted in the urine. A 24-hour urinary 5-HIAA test is the gold standard for diagnosis. **2. Why the other options are incorrect:** * **Aminolevulinic acid (ALA):** Elevated in Acute Intermittent Porphyria (AIP). While AIP presents with abdominal pain, it does not cause flushing, wheezing, or liver masses. * **FIGLU (Formiminoglutamic acid):** Elevated in **Folic acid deficiency**. It is a metabolic intermediate in histidine metabolism and is unrelated to neuroendocrine tumors. * **Norepinephrine:** Elevated in **Pheochromocytoma**. While this can cause flushing and hypertension, it does not typically cause chronic watery diarrhea or wheezing, and the primary mass would be in the adrenal gland. **Clinical Pearls for NEET-PG:** * **Triad of Carcinoid:** Flushing, Diarrhea, and Right-sided heart failure (Tricuspid regurgitation/Pulmonary stenosis). * **Pellagra Connection:** Excessive serotonin production consumes systemic **Tryptophan**, leading to Niacin (Vitamin B3) deficiency, potentially causing dermatitis, dementia, and diarrhea. * **Treatment:** **Octreotide** (Somatostatin analogue) is used to manage symptoms and "Carcinoid Crisis."

Question 1

A patient presents with a history of mild diarrhea, blood in stools, and multiple fistulas. What is the most probable diagnosis?

Accepted Answer

Crohn's disease

Answer

Intestinal tuberculosis

Answer

Ulcerative colitis

Answer

Typhoid

Question 2

Oral examination is indicated in which of the following conditions?

Accepted Answer

Peutz-Jeghers syndrome

Answer

Psoriasis

Answer

Beri-beri

Answer

Plummer-Vinson syndrome

Question 3

Which of the following is not a marker of the active replicative phase of chronic hepatitis B?

Accepted Answer

Anti-HBc

Answer

HBV DNA

Answer

HBV DNA polymerase

Answer

AST & ALT

Question 4

A 85-year-old man presents with severe crampy abdominal pain which is worse after eating, associated with frequent nausea, bloating and watery diarrhoea. His other medical problems include coronary artery disease, hypertension, hypercholesterolemia. He has a 40-pack-year smoking history. Barium enema is as shown. What is the most probable cause?

Accepted Answer

Atherosclerosis of the mesenteric arteries

Answer

Left ventricular aneurysm

Answer

Transmural inflammation of the small intestine

Answer

Progressive pancreatic inflammation

Question 5

A 60-year-old man with a known history of hemochromatosis, cirrhosis, and portal hypertension presented to the emergency department with altered mental status. The patient's attendant reported that over the last three days, the patient has become confused. There is no history of melena or hematemesis. For chronic ascites, diet control and spironolactone are being administered regularly. In the past, the patient experienced an episode of variceal bleeding for which he was prescribed propranolol, and no further episodes have occurred. On examination, the patient is not well-oriented to time and place but is oriented to person. He is afebrile, and his vital signs are stable; however, ascites and asterixis are notable. Laboratory investigations show a hemoglobin of 10.1 g/dL, creatinine of 1.4 mg/dL, and blood urea nitrogen of 45 mg/dL. Paracentesis revealed clear fluid with 800 WBC (40% neutrophils). Which statement regarding this condition is false?

Accepted Answer

Ascites is often preceded by infection.

Answer

Clinical features include abdominal pain, fever, leukocytosis, and altered mental status.

Answer

Ascitic fluid protein is typically 1 gm/dL.

Answer

Common causative organisms are Gram-negative bacteria.

Question 6

All of the following are used in the treatment of acute pancreatitis EXCEPT?

Accepted Answer

Antibiotics

Answer

Analgesics

Answer

IV fluids

Answer

Nasojejunal feeds

Question 7

All of the following can predispose to non-cirrhotic portal fibrosis, EXCEPT:

Accepted Answer

Radiation exposure

Answer

Xenobiotics exposure

Answer

Arsenic contaminated water

Answer

Repeated intestinal parasitic infections

Question 8

A 40-year-old male with a history of jaundice and ascites is a known alcoholic. Which of the following statements is true regarding his condition?

Accepted Answer

Decreased liver span

Answer

AST/ALT ratio < 2

Answer

Polymorphonuclear count > 5500/L

Answer

Increased serum lactate dehydrogenase

Question 9

A 39-year-old female presents with chronic abdominal cramps, watery diarrhea, and periodic facial flushing. Examination reveals wheezing and a slightly enlarged liver. Workup reveals several masses within the liver and a large mass in the small intestine. Which of the following substances is likely to be elevated in her urine?

Accepted Answer

5-HIAA

Answer

Aminolevulinic acid (ALA)

Answer

FIGLU

Answer

Norepinephrine

Question 10

A 40-year-old male patient presented with mild abdominal pain, mild constipation with a feeling of incomplete evacuation, and mucus in stools for the past four years. On examination, tenderness is present in the left iliac fossa. What is the most likely diagnosis?

Accepted Answer

Diverticular disease of the colon

Answer

Ulcerative colitis

Answer

Irritable bowel syndrome

Answer

Carcinoma of the colon

Gastroenterology — MCQs

Gastroenterology — MCQs

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