Gastroenterology — MCQs

A 35-year-old woman presents with jaundice and is evaluated in the emergency department. For several days, she has experienced mild flu-like symptoms including anorexia, nausea, vomiting, fatigue, low-grade fever, and malaise. This morning, she noticed her urine was brown, and she has also developed moderate, steady pain in the right upper quadrant of her abdomen. She has no history of similar episodes. Physical examination reveals jaundice and an enlarged, tender liver. Blood chemistry studies show alanine aminotransferase (ALT) of 15,000 mIU/L, aspartate aminotransferase (AST) of 11,000 mIU/L, and alkaline phosphatase of 100 U/L. Which of the following is the most likely diagnosis?

Q836Medium

Which of the following statements is false?

Q837Medium

All of the following can be seen as post-diarrheal complications except?

Q838Medium

A 19-year-old woman presents with a tremor at rest that has progressively worsened over 6 months. She also exhibits paranoid ideation with auditory hallucinations and has been diagnosed with acute psychosis. Physical examination reveals scleral icterus, and a slit-lamp examination shows corneal Kayser-Fleischer rings. Laboratory findings include total serum protein of 5.9 g/dL, albumin of 3.1 g/dL, total bilirubin of 4.9 mg/dL, direct bilirubin of 3.1 mg/dL, AST of 128 U/L, ALT of 157 U/L, and alkaline phosphatase of 56 U/L. Which of the following additional serologic test findings is most likely to be reported in this patient?

Q839Medium

A 30-year-old woman presents with dysphagia for both solids and liquids. Barium swallow shows a 'parrot beak' appearance. Esophageal manometry reveals increased lower esophageal sphincter (LES) pressure. What is the appropriate management?

Q840Easy

Which of the following viruses does not produce viral esophagitis?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 831: Which one of the following is not advocated in the management of hepatic encephalopathy?

A. Oral Lactulose
B. Intravenous Glucose drip
C. High protein diet more than 60 grams/day (Correct Answer)
D. Colonic washout if tests for blood in stool are positive

Explanation: The management of hepatic encephalopathy (HE) focuses on reducing the production and absorption of gut-derived neurotoxins, primarily ammonia [1]. **Why Option C is the correct answer:** In the past, protein restriction was common; however, modern guidelines emphasize that patients with cirrhosis are in a highly catabolic state [2]. While excessive protein can trigger HE, **severe protein restriction is harmful** as it leads to muscle wasting (sarcopenia), which actually worsens hyperammonemia because skeletal muscle is a key site for ammonia detoxification. However, the standard recommendation is to maintain a protein intake of **1.2 to 1.5 g/kg/day**. A "high protein diet" exceeding 60g/day *during an acute episode* of HE is generally avoided; instead, protein is titrated. More importantly, the question asks what is **not advocated**: historically and in exams, "High protein diet" is the classic trigger to avoid, as ammonia is a byproduct of protein metabolism. **Analysis of Incorrect Options:** * **A. Oral Lactulose:** This is the **first-line treatment**. It is a non-absorbable disaccharide that acts as an osmotic laxative and acidifies the colon (converting $NH_3$ to non-absorbable $NH_4^+$), reducing ammonia absorption. * **B. IV Glucose:** Hypoglycemia can mimic or worsen encephalopathy [2]. Furthermore, glucose provides essential calories to prevent the breakdown of endogenous proteins (gluconeogenesis), which would otherwise increase ammonia levels. * **D. Colonic Washout:** Gastrointestinal bleeding is a major precipitant of HE because blood in the gut acts as a massive protein load. If stool tests are positive for blood, clearing the gut via enemas or washouts is indicated to remove the nitrogenous source. **NEET-PG High-Yield Pearls:** * **Drug of Choice (Acute):** Lactulose. * **Best Antibiotic Add-on:** Rifaximin (reduces ammonia-producing gut flora). * **Most common precipitant:** Infections (SBP), GI bleed, dehydration, or constipation. * **Flumazenil:** Can be used if benzodiazepine overdose is suspected as a co-factor.

Question 832: When ascitic fluid is a typical transudate but contains more than 250 WBC/cmm, what is the probable diagnosis?

A. Congestive heart failure (CHF)
B. Tubercular ascites
C. Cirrhosis of liver
D. Cirrhotic ascites with occult peritoneal infection (Correct Answer)

Explanation: The diagnosis of ascitic fluid is based on the **Serum-Ascites Albumin Gradient (SAAG)** and the **Absolute Neutrophil Count (ANC)**. [1] **1. Why Option D is Correct:** In a patient with cirrhosis, the ascitic fluid is typically a **transudate** (SAAG ≥ 1.1 g/dL) due to portal hypertension. [1] However, the normal WBC count in uncomplicated cirrhotic ascites is <250 cells/mm³. When the WBC count exceeds **250 cells/mm³** (specifically neutrophils), it indicates an inflammatory response within the peritoneum. In the absence of a surgically treatable source of infection, this is diagnostic of **Spontaneous Bacterial Peritonitis (SBP)** or occult peritoneal infection. **2. Why Other Options are Incorrect:** * **A. Congestive Heart Failure (CHF):** While CHF produces a high SAAG (transudate), the WBC count is typically very low (<50–100 cells/mm³). High protein content (>2.5 g/dL) is more characteristic of CHF than high cell count. [1] * **B. Tubercular Ascites:** This typically presents as an **exudate** (SAAG < 1.1 g/dL) with a high protein count and a predominance of **lymphocytes**, not just a general increase in WBCs. [1] * **C. Cirrhosis of Liver:** Uncomplicated cirrhosis presents as a transudate, but the WBC count must be **<250 cells/mm³**. Once it crosses this threshold, it is no longer "simple" cirrhotic ascites. [1] **High-Yield NEET-PG Pearls:** * **SBP Definition:** Ascitic fluid PMN (polymorphonuclear leukocyte) count **≥ 250 cells/mm³** with a positive culture. * **Culture-Negative Neutrocytic Ascites (CNNA):** PMN ≥ 250 cells/mm³ but negative culture; treated the same as SBP. * **Mnemonic:** High SAAG (≥ 1.1) = Portal Hypertension (Cirrhosis, CHF, Budd-Chiari). Low SAAG (< 1.1) = Non-portal hypertension (TB, Malignancy, Nephrotic syndrome). [1] * **Treatment of choice for SBP:** Third-generation cephalosporins (e.g., **Cefotaxime**).

Question 833: A 25-year-old male presents with pigmented macules on the palms, soles, and oral mucosa. He also has anemia and abdominal pain. What is the most probable diagnosis?

A. Albright's syndrome
B. Cushing's syndrome
C. Peutz-Jeghers syndrome (Correct Answer)
D. Incontinentia pigmenti

Explanation: ### Explanation **Correct Answer: C. Peutz-Jeghers syndrome (PJS)** **1. Why it is correct:** Peutz-Jeghers syndrome is an autosomal dominant condition characterized by the mutation of the **STK11 (LKB1)** gene on chromosome 19. The clinical hallmark is the presence of **mucocutaneous hyperpigmentation** (melanotic macules) on the lips, buccal mucosa, palms, and soles. These patients develop multiple **hamartomatous polyps** throughout the GI tract (most commonly the small intestine) [1]. These polyps often lead to complications like **intussusception**, chronic GI bleeding (causing **anemia**), and abdominal pain. **2. Why the other options are incorrect:** * **Albright’s syndrome (McCune-Albright):** Characterized by a triad of polyostotic fibrous dysplasia, precocious puberty, and *Café-au-lait* spots (large, irregular "Coast of Maine" borders), not small mucosal macules. * **Cushing’s syndrome:** Presents with systemic features like truncal obesity, striae, and hypertension. While hyperpigmentation can occur in ACTH-dependent causes (Addisonian type), it lacks the characteristic hamartomatous polyposis and mucosal distribution seen here. * **Incontinentia pigmenti:** An X-linked dominant dermatosis that follows the Lines of Blaschko. It progresses through stages (vesicular, verrucous, hyperpigmented, and atrophic) and is usually seen in females, as it is typically lethal in males. **3. NEET-PG High-Yield Pearls:** * **Inheritance:** Autosomal Dominant (STK11 gene). * **Polyp Type:** Hamartomatous (characterized by a "branching tree" appearance of smooth muscle) [1]. * **Cancer Risk:** Significantly increased risk of GI (colorectal, pancreatic) and extra-GI malignancies (breast, ovary, cervix, and Sertoli cell tumors of the testes) [1]. * **Most common site of polyps:** Small intestine (Jejunum > Ileum > Duodenum). * **Most common complication:** Intussusception.

Question 834: Regarding Schatzki's ring, what is the true statement?

A. It has skeletal muscle.
B. It is located at the upper esophagus.
C. It is located at the lower esophagus. (Correct Answer)
D. It contains all layers of the esophagus.

Explanation: Schatzki’s ring (also known as a B-ring) is a smooth, benign, circumferential thin mucosal narrowing located at the squamocolumnar junction of the lower esophagus. It is one of the most common causes of intermittent solid food dysphagia ("Steakhouse Syndrome"). Analysis of Options: * Option C (Correct): Schatzki’s rings are strictly located at the distal esophagus, specifically at the junction of the esophageal and gastric mucosa (Z-line) [1]. They are almost always associated with a hiatal hernia [1]. * Option A: The lower esophagus consists primarily of smooth muscle. Skeletal muscle is found in the upper third of the esophagus. * Option B: Rings or webs in the upper esophagus are characteristic of Plummer-Vinson Syndrome, not Schatzki’s ring. * Option D: A Schatzki’s ring is a mucosal ring, meaning it consists only of mucosa and submucosa. It does not contain the muscularis propria layer (unlike esophageal "A-rings" or contractile rings). High-Yield Clinical Pearls for NEET-PG: * Clinical Presentation: Intermittent dysphagia to solids, often triggered by poorly chewed meat or bread. * Diagnosis: Barium Swallow is more sensitive than endoscopy for detection; it appears as a thin, diaphragm-like transverse band. * Association: Strongly associated with Hiatal Hernia and sometimes GERD [1]. * Treatment: Reassurance and dietary modification (chewing thoroughly); if symptomatic, endoscopic dilation is the treatment of choice.

Question 835: A 35-year-old woman presents with jaundice and is evaluated in the emergency department. For several days, she has experienced mild flu-like symptoms including anorexia, nausea, vomiting, fatigue, low-grade fever, and malaise. This morning, she noticed her urine was brown, and she has also developed moderate, steady pain in the right upper quadrant of her abdomen. She has no history of similar episodes. Physical examination reveals jaundice and an enlarged, tender liver. Blood chemistry studies show alanine aminotransferase (ALT) of 15,000 mIU/L, aspartate aminotransferase (AST) of 11,000 mIU/L, and alkaline phosphatase of 100 U/L. Which of the following is the most likely diagnosis?

A. Acute hepatitis (Correct Answer)
B. Chronic hepatitis
C. Gallstone disease
D. Hepatic cirrhosis

Explanation: **Explanation:** The clinical presentation and laboratory findings are classic for **Acute Hepatitis**. **1. Why Acute Hepatitis is correct:** The patient presents with a prodrome of "flu-like" symptoms (anorexia, malaise, fever) followed by jaundice and right upper quadrant pain, which is the typical clinical course of acute viral or toxic hepatitis [2]. The hallmark of this case is the **massive elevation of serum aminotransferases (ALT/AST >10,000 U/L)**. In clinical practice, transaminase levels exceeding 1,000–5,000 U/L are highly suggestive of acute hepatocellular injury, most commonly caused by acute viral hepatitis (A, B, or E), drug-induced liver injury (e.g., Acetaminophen), or ischemic hepatitis ("shock liver") [1]. **2. Why the other options are incorrect:** * **Chronic Hepatitis:** This typically presents with mild to moderate elevations in transaminases (usually <500 U/L) and persists for over six months [3]. It does not cause the acute, massive "spike" seen here. * **Gallstone Disease (Choledocholithiasis):** While it causes RUQ pain and jaundice, it typically presents with a **cholestatic pattern** (disproportionately high Alkaline Phosphatase) rather than extreme transaminase elevation. * **Hepatic Cirrhosis:** This is a chronic, end-stage fibrotic process. Transaminases are often near normal or only slightly elevated because there is little functional parenchyma left to leak enzymes. **NEET-PG High-Yield Pearls:** * **ALT > AST:** Typical for most forms of acute viral hepatitis. * **AST > ALT (2:1 ratio):** Highly suggestive of **Alcoholic Hepatitis** (though levels rarely exceed 500 U/L in alcoholic cases). * **Highest Transaminase Levels (>10,000 U/L):** Usually seen in **Ischemic Hepatitis**, **Acetaminophen toxicity**, or **Acute Viral Hepatitis** [1]. * **Bilirubinuria:** The "brown urine" indicates conjugated hyperbilirubinemia, confirming the jaundice is hepatic or post-hepatic in origin [2].

Question 836: Which of the following statements is false?

A. Primary biliary cholangitis involves only intrahepatic bile ducts.
B. Primary biliary cholangitis is associated with rheumatoid arthritis.
C. Primary sclerosing cholangitis is seen more frequently in males than females.
D. Primary sclerosing cholangitis involves only extrahepatic bile ducts. (Correct Answer)

Explanation: **Explanation:** The correct answer is **D** because it is a false statement. **Primary Sclerosing Cholangitis (PSC)** is a chronic cholestatic liver disease characterized by inflammation and fibrotic strictures of **both intrahepatic and extrahepatic bile ducts** [2]. On imaging (MRCP/ERCP), this typically manifests as a "beaded appearance" due to alternating segments of narrowing and dilation. **Analysis of other options:** * **Option A (True):** Primary Biliary Cholangitis (PBC) is an autoimmune destruction specifically targeting the **small, interlobular intrahepatic bile ducts** [2]. It does not involve the extrahepatic biliary tree. * **Option B (True):** PBC is frequently associated with other autoimmune conditions. While Sjögren’s syndrome is the most common (up to 70%), there is a significant association with **Rheumatoid Arthritis**, scleroderma (CREST syndrome), and autoimmune thyroiditis [2]. * **Option C (True):** PSC shows a distinct male predilection (approximately **2:1 male-to-female ratio**), whereas PBC is overwhelmingly more common in females (9:1 ratio) [2]. **High-Yield Clinical Pearls for NEET-PG:** * **PSC Association:** Strongly associated with **Ulcerative Colitis** (approx. 70-80% of PSC patients have IBD) [1], [2]. It significantly increases the risk of **Cholangiocarcinoma**. * **PBC Marker:** The hallmark is the **Anti-Mitochondrial Antibody (AMA)**, positive in >95% of cases [2]. * **PSC Marker:** Often associated with **p-ANCA** (though not specific) [1], [2]. * **Histology:** PBC shows "Florid duct lesions"; PSC shows "Onion-skin fibrosis" around bile ducts.

Question 837: All of the following can be seen as post-diarrheal complications except?

A. Hemolytic Uremic Syndrome (HUS)
B. Nephritic syndrome (Correct Answer)
C. Reactive arthritis
D. Guillain-Barré syndrome

Explanation: **Explanation:** The correct answer is **Nephritic Syndrome**. While certain diarrheal infections can lead to renal involvement, they typically manifest as acute kidney injury (AKI) or thrombotic microangiopathy rather than a classic nephritic syndrome (which is characterized by hematuria, hypertension, and RBC casts, usually following streptococcal skin or throat infections) [1]. **Why the other options are incorrect:** * **Hemolytic Uremic Syndrome (HUS):** This is a classic post-diarrheal complication, most commonly associated with **Enterohemorrhagic *E. coli* (O157:H7)** and *Shigella dysenteriae* [1]. It is characterized by the triad of microangiopathic hemolytic anemia, thrombocytopenia, and acute renal failure [1]. * **Reactive Arthritis:** Formerly known as Reiter’s Syndrome, this sterile joint inflammation occurs following enteric infections with organisms like ***Salmonella*, *Shigella*, *Campylobacter*, or *Yersinia***. It often presents with the "can't see, can't pee, can't climb a tree" triad (conjunctivitis, urethritis, arthritis). * **Guillain-Barré Syndrome (GBS):** This is an acute post-infectious polyneuropathy. ***Campylobacter jejuni*** is the most common antecedent pathogen identified in GBS cases due to molecular mimicry between bacterial lipooligosaccharides and human nerve gangliosides. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of HUS in children:** Shiga-toxin producing *E. coli* (STEC) [1]. * **Most common trigger for GBS:** *Campylobacter jejuni*. * **HLA-B27 association:** Strongly linked with the development of Reactive Arthritis following infectious diarrhea. * **Yersinia enterocolitica:** Can mimic acute appendicitis (pseudoappendicitis) and is a frequent trigger for reactive arthritis.

Question 838: A 19-year-old woman presents with a tremor at rest that has progressively worsened over 6 months. She also exhibits paranoid ideation with auditory hallucinations and has been diagnosed with acute psychosis. Physical examination reveals scleral icterus, and a slit-lamp examination shows corneal Kayser-Fleischer rings. Laboratory findings include total serum protein of 5.9 g/dL, albumin of 3.1 g/dL, total bilirubin of 4.9 mg/dL, direct bilirubin of 3.1 mg/dL, AST of 128 U/L, ALT of 157 U/L, and alkaline phosphatase of 56 U/L. Which of the following additional serologic test findings is most likely to be reported in this patient?

A. Decreased alpha-1-antitrypsin level
B. Decreased ceruloplasmin level (Correct Answer)
C. Increased alpha-fetoprotein level
D. Increased ferritin level

Explanation: ### **Explanation** The clinical presentation of a young adult with a combination of **neuropsychiatric symptoms** (tremor, psychosis), **liver dysfunction** (jaundice, low albumin), and pathognomonic **Kayser-Fleischer (KF) rings** on slit-lamp examination is diagnostic of **Wilson Disease (Hepatolenticular Degeneration).** **1. Why the Correct Answer is Right:** Wilson disease is an autosomal recessive disorder caused by mutations in the **ATP7B gene** on chromosome 13. This defect impairs biliary copper excretion and the incorporation of copper into apo-ceruloplasmin. Consequently, copper accumulates in the liver, brain (basal ganglia), and cornea. In over 90% of patients, the failure to form holoceruloplasmin leads to a **decreased serum ceruloplasmin level (<20 mg/dL)**. **2. Why the Incorrect Options are Wrong:** * **Option A:** Decreased alpha-1-antitrypsin is seen in **AAT deficiency**, which causes neonatal jaundice or adult emphysema/cirrhosis but does not present with KF rings or primary psychiatric symptoms. * **Option C:** Increased alpha-fetoprotein (AFP) is a marker for **Hepatocellular Carcinoma (HCC)**. While Wilson disease causes cirrhosis, HCC is paradoxically less common in Wilson disease compared to other forms of cirrhosis. * **Option D:** Increased ferritin is characteristic of **Hereditary Hemochromatosis**. While it causes "bronze diabetes" and cirrhosis, it typically presents in older males and lacks the specific neurological and corneal findings seen here. ### **NEET-PG High-Yield Pearls** * **Diagnosis:** The most sensitive screening test is **decreased serum ceruloplasmin**; the most accurate/gold standard is **liver biopsy** (increased copper content >250 μg/g). * **Lab Clue:** A unique biochemical feature of Wilsonian fulminant hepatic failure is a **very low Alkaline Phosphatase (ALP)** and a low ALP-to-bilirubin ratio. * **Imaging:** "Face of the Giant Panda" sign on MRI brain (midbrain involvement). * **Treatment:** Drug of choice is **D-Penicillamine** (chelator) or **Trientine**. Zinc is used for maintenance or in asymptomatic patients (prevents copper absorption).

Question 839: A 30-year-old woman presents with dysphagia for both solids and liquids. Barium swallow shows a 'parrot beak' appearance. Esophageal manometry reveals increased lower esophageal sphincter (LES) pressure. What is the appropriate management?

A. Nitrates
B. Calcium channel blockers
C. Botulinum toxin
D. All of the above (Correct Answer)

Explanation: ### Explanation **Diagnosis:** The clinical presentation of dysphagia for both solids and liquids, the classic **'parrot beak' (or bird-beak)** appearance on barium swallow, and increased LES pressure on manometry are diagnostic of **Achalasia Cardia**. **Why 'All of the above' is correct:** The primary goal in treating Achalasia is to reduce the Lower Esophageal Sphincter (LES) pressure to facilitate the passage of food. Pharmacological management is typically reserved for patients who are not candidates for or refuse definitive procedures (like Balloon Dilatation or Heller’s Myotomy). * **Nitrates (e.g., Isosorbide dinitrate):** These act as nitric oxide donors, promoting smooth muscle relaxation of the LES. * **Calcium Channel Blockers (e.g., Nifedipine):** These inhibit calcium influx into smooth muscle cells, reducing LES tone. * **Botulinum Toxin:** When injected endoscopically into the LES, it inhibits the release of acetylcholine from excitatory neurons, leading to muscle paralysis and decreased pressure. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows aperistalsis and incomplete LES relaxation). * **Most Effective Non-Surgical Treatment:** Pneumatic (Balloon) Dilatation. * **Definitive Surgical Treatment:** Modified Heller’s Myotomy (often performed with a partial fundoplication to prevent GERD). * **POEM (Per-Oral Endoscopic Myotomy):** A newer, minimally invasive endoscopic technique gaining popularity. * **Triad of Achalasia:** 1. Incomplete LES relaxation, 2. Increased LES tone, 3. Aperistalsis of the esophageal body.

Question 840: Which of the following viruses does not produce viral esophagitis?

A. Herpes simplex virus
B. Adenovirus (Correct Answer)
C. Varicella zoster virus
D. Cytomegalovirus

Explanation: **Explanation:** Viral esophagitis is a common cause of odynophagia and dysphagia, particularly in immunocompromised patients (e.g., HIV/AIDS, transplant recipients, or those on chemotherapy). **Why Adenovirus is the correct answer:** While **Adenovirus** is a common cause of respiratory infections, conjunctivitis, and gastroenteritis (diarrhea), it is **not** a recognized cause of infectious esophagitis. The esophagus is rarely, if ever, a target organ for Adenovirus, even in severely immunocompromised states. **Analysis of incorrect options:** * **Herpes simplex virus (HSV):** HSV-1 is the most common viral cause of esophagitis in healthy individuals and the second most common in AIDS patients. It typically presents with small, "punched-out" ulcers (volcano-like) and characteristic Cowdry Type A inclusion bodies on biopsy. * **Cytomegalovirus (CMV):** CMV is the most common viral cause of esophagitis in AIDS patients. Unlike HSV, it produces large, shallow, linear ulcerations. Biopsy shows "owl’s eye" intranuclear inclusions. * **Varicella zoster virus (VZV):** Though rare, VZV can cause esophagitis, usually in children with chickenpox or adults with disseminated shingles. It presents with vesicles and ulcers similar to HSV. **High-Yield Clinical Pearls for NEET-PG:** * **HSV Esophagitis:** Biopsy should be taken from the **edge** of the ulcer (where the virus replicates in squamous cells). * **CMV Esophagitis:** Biopsy should be taken from the **base** of the ulcer (as it affects subepithelial endothelial cells and fibroblasts). * **Treatment:** Acyclovir is the drug of choice for HSV/VZV; Ganciclovir is the drug of choice for CMV. * **Candida albicans** remains the overall most common cause of infectious esophagitis.

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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