Gastroenterology — MCQs

A 20-year-old woman presents with a 2-year history of difficulty swallowing and increasing fatigue. A CBC shows iron-deficiency anemia. Upper endoscopy reveals an annular narrowing in the upper third of the esophagus. A mucosal biopsy shows no evidence of inflammation or neoplasia. Which of the following is the most likely diagnosis?

Q828Medium

Which of the following is not a feature of non-cirrhotic portal hypertension?

Q829Easy

Steakhouse syndrome or intermittent food impaction is due to which of the following anomalies?

Q830Easy

The "corkscrew appearance" is characteristic of which of the following conditions?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 821: Which of the following is NOT true regarding Gilbert's syndrome?

A. Conjugated hyperbilirubinemia (Correct Answer)
B. Fasting hypoglycemia
C. Normal liver histology
D. Normal liver enzymes

Explanation: **Explanation:** **Gilbert’s Syndrome** is the most common hereditary cause of hyperbilirubinemia, affecting approximately 3–7% of the population [2]. It is an autosomal recessive condition characterized by a **reduction in the activity of the enzyme Uridine diphosphate-glucuronosyltransferase (UGT1A1)** to about 30% of normal [1]. 1. **Why Option A is correct:** Gilbert’s syndrome causes **unconjugated (indirect) hyperbilirubinemia**, not conjugated [2]. Because the defect lies in the conjugation process (converting indirect bilirubin to direct bilirubin), the unconjugated fraction rises, especially during stress, fasting, or illness. 2. **Why the other options are incorrect:** * **Fasting/Hypoglycemia (B):** While fasting itself doesn't cause hypoglycemia in these patients, **prolonged fasting** is a classic trigger that exacerbates jaundice in Gilbert’s syndrome by further reducing UGT activity and increasing heme turnover [2]. * **Normal Liver Histology (C):** The liver architecture remains perfectly normal in Gilbert’s syndrome. There is no fibrosis, inflammation, or pigment deposition (unlike Dubin-Johnson syndrome). * **Normal Liver Enzymes (D):** A key diagnostic feature is that ALT, AST, Alkaline Phosphatase, and Albumin levels remain within normal limits. The only abnormality is a mild rise in unconjugated bilirubin (usually <4 mg/dL). **High-Yield Clinical Pearls for NEET-PG:** * **Genetic Defect:** Mutation in the promoter region of the **UGT1A1 gene** (insertion of extra TA repeats) [2]. * **Triggers:** Jaundice is precipitated by fasting, dehydration, physical exertion, febrile illness, and menstruation [2]. * **Diagnosis:** Suggested by the **"Fasting Test"** (bilirubin rises upon calorie restriction) or administration of **Phenobarbital**, which decreases bilirubin levels by inducing UGT enzyme activity [1]. * **Prognosis:** It is a benign condition requiring no specific treatment.

Question 822: Which of the following anemias is caused by H. pylori infection?

A. Iron deficiency anemia (Correct Answer)
B. Sideroblastic anemia
C. Hemolytic anemia
D. Aplastic anemia

Explanation: **Explanation:** **1. Why Iron Deficiency Anemia (IDA) is Correct:** *Helicobacter pylori* infection is a well-established cause of refractory iron deficiency anemia [3]. The underlying pathophysiology involves several mechanisms: * **Decreased Absorption:** *H. pylori* causes chronic gastritis, leading to **hypochlorhydria** (reduced stomach acid). Gastric acid is essential for reducing dietary ferric iron ($Fe^{3+}$) to the more absorbable ferrous ($Fe^{2+}$) form. * **Iron Sequestration:** The bacteria utilize host iron for their own growth and metabolism. * **Increased Loss:** Chronic infection can lead to occult gastrointestinal bleeding from erosive gastritis or peptic ulcers [2]. * **Hepcidin Regulation:** Chronic inflammation increases systemic hepcidin levels, which inhibits ferroportin, thereby blocking iron release from stores [1]. **2. Why the Other Options are Incorrect:** * **B. Sideroblastic Anemia:** This is typically caused by defects in heme synthesis (e.g., lead poisoning, vitamin B6 deficiency, or hereditary causes). It is not associated with bacterial infections. * **C. Hemolytic Anemia:** This involves the premature destruction of RBCs. While some infections (like Malaria or *Mycoplasma*) cause hemolysis, *H. pylori* does not. * **D. Aplastic Anemia:** This is a bone marrow failure syndrome. It is usually idiopathic or triggered by drugs, toxins, or viruses (like Hepatitis or Parvovirus B19), but not by gastric bacterial pathogens. **3. Clinical Pearls for NEET-PG:** * **High-Yield Fact:** In patients with unexplained IDA, current guidelines recommend testing for and treating *H. pylori*. * **Vitamin B12 Link:** Chronic *H. pylori* infection can also lead to **Vitamin B12 deficiency** (Megaloblastic Anemia) due to parietal cell damage and decreased Intrinsic Factor production [3]. * **MALToma:** Remember that *H. pylori* is also a Type 1 Carcinogen and is the primary risk factor for MALT lymphoma and Gastric Adenocarcinoma.

Question 823: Before starting Infliximab in a 65-year-old gentleman for Inflammatory bowel disease, which of the following tests is mandatory?

A. Colonoscopy
B. Mantoux test (Correct Answer)
C. ERCP
D. Liver biopsy

Explanation: **Explanation:** **1. Why Mantoux Test is Correct:** Infliximab is a potent **TNF-alpha (Tumor Necrosis Factor) inhibitor**. TNF-alpha plays a crucial role in the formation and maintenance of **granulomas**, which are the body’s primary mechanism for sequestering *Mycobacterium tuberculosis*. By inhibiting TNF-alpha, Infliximab can lead to the breakdown of these granulomas, causing the **reactivation of Latent Tuberculosis Infection (LTBI)** into active, often disseminated, disease. Therefore, screening for TB using a **Mantoux test (TST)** or an Interferon-Gamma Release Assay (IGRA), along with a Chest X-ray, is mandatory before initiating any anti-TNF therapy, especially in TB-endemic regions like India [1]. **2. Why Other Options are Incorrect:** * **Colonoscopy (A):** While essential for the initial diagnosis and monitoring of IBD, it is not a specific safety requirement "mandatory" immediately before starting a biologic agent. * **ERCP (C):** This is an invasive procedure used for biliary or pancreatic duct pathologies (e.g., Primary Sclerosing Cholangitis associated with UC) and has no role in the pre-biologic screening protocol. * **Liver Biopsy (D):** This is not required. While baseline Liver Function Tests (LFTs) are checked, a biopsy is an invasive procedure reserved for specific diagnostic dilemmas, not routine screening. **Clinical Pearls for NEET-PG:** * **Pre-Infliximab Screening Checklist:** TB screening (Mantoux/IGRA + CXR), Hepatitis B Surface Antigen (HBsAg), and Hepatitis C serology [1]. * **Vaccination:** Patients should receive inactivated vaccines (e.g., Flu, Pneumococcal) before starting; **Live vaccines** (e.g., BCG, Yellow Fever) are **contraindicated** once therapy begins. * **Side Effects:** Infliximab increases the risk of serious infections, reactivation of Hepatitis B, and potentially worsens Heart Failure (NYHA Class III/IV).

Question 824: A young female with a known myeloproliferative disorder presents with a 3-day history of progressive abdominal discomfort and ascites. What is the most likely diagnosis?

A. Budd-Chiari syndrome (Correct Answer)
B. Hepatitis A
C. Perforation peritonitis
D. Acute pancreatitis

Explanation: ### Explanation **Correct Option: A. Budd-Chiari Syndrome (BCS)** Budd-Chiari syndrome is defined as the obstruction of hepatic venous outflow, ranging from the small hepatic veins to the junction of the inferior vena cava (IVC) and the right atrium. [1] * **The Link:** The most common underlying cause of BCS is a **hypercoagulable state**. Myeloproliferative disorders (like Polycythemia Vera or Essential Thrombocythemia) are the leading systemic causes, accounting for nearly 40-50% of cases. * **Clinical Presentation:** The "Classic Triad" consists of **abdominal pain, ascites, and hepatomegaly**. In a young patient with a known prothrombotic condition presenting with rapid-onset ascites, BCS is the diagnosis until proven otherwise. [1] **Why Other Options are Incorrect:** * **B. Hepatitis A:** While it causes abdominal discomfort, it typically presents with a prodrome of fever, malaise, and significant jaundice. Ascites is rare in acute viral hepatitis unless it progresses to fulminant hepatic failure. * **C. Perforation Peritonitis:** This presents as an "acute abdomen" with guarding, rigidity, and rebound tenderness. While there may be peritoneal fluid, it is inflammatory/purulent, not the massive transudative ascites seen in venous obstruction. [2] * **D. Acute Pancreatitis:** This presents with severe epigastric pain radiating to the back and elevated amylase/lipase. While it can cause localized fluid collection, it is not typically associated with myeloproliferative disorders. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** Doppler Ultrasound (initial); **Venography** (Gold Standard). * **Pathognomonic Sign:** "Caudate lobe hypertrophy" on CT/MRI (as its venous drainage directly enters the IVC, bypassing the hepatic veins). * **Nutmeg Liver:** Chronic congestion leads to a mottled appearance of the liver parenchyma. * **Most common cause worldwide:** Primary thrombosis (hypercoagulable states); in Asia, **membranous webs** in the IVC are frequently seen.

Question 825: Wilson's disease is characterized by all of the following except?

A. The defective gene is ATP7A (Correct Answer)
B. Neurological features include Parkinsonian features and ataxia
C. Kayser-Fleischer rings and sunflower cataracts are typical eye findings
D. Liver biopsy is confirmatory for the diagnosis

Explanation: **Explanation:** Wilson’s Disease (Hepatolenticular Degeneration) is an autosomal recessive disorder of copper metabolism. **1. Why Option A is the Correct Answer (The Exception):** The defective gene in Wilson’s disease is **ATP7B**, located on **Chromosome 13**. This gene encodes a copper-transporting P-type ATPase responsible for transporting copper into the bile and incorporating it into ceruloplasmin. * **ATP7A** is the defective gene in **Menkes Disease** ("Kinky Hair Syndrome"), which leads to systemic copper deficiency rather than overload. **2. Analysis of Other Options:** * **Option B:** Copper deposition in the basal ganglia (especially the putamen) leads to extrapyramidal symptoms [1]. Common features include **Parkinsonian signs** (tremors, rigidity), dystonia, ataxia, and a characteristic "wing-beating" tremor [1]. * **Option C:** **Kayser-Fleischer (KF) rings** (copper deposition in the Descemet’s membrane of the cornea) are present in 95% of neurological cases. **Sunflower cataracts** (copper in the lens) are also classic, though less common. * **Option D:** While initial screening involves serum ceruloplasmin and 24-hour urinary copper, a **liver biopsy** showing a copper content **>250 µg/g dry weight** remains the gold standard and confirmatory test for diagnosis. **Clinical Pearls for NEET-PG:** * **Screening Test:** Serum Ceruloplasmin (usually <20 mg/dL). * **Most Sensitive Test:** 24-hour urinary copper excretion (>100 µg/day). * **MRI Brain Finding:** "Face of the Giant Panda" sign in the midbrain. * **Treatment:** Chelators like **D-Penicillamine** (first-line) or Trientine [1]; Zinc is used for maintenance as it inhibits intestinal copper absorption.

Question 826: A patient presents with lower gastrointestinal bleed. Sigmoidoscopy shows ulcers in the sigmoid colon. Biopsy from this area shows flask-shaped ulcers. Which of the following is the most appropriate treatment?

A. Intravenous ceftriaxone
B. Intravenous metronidazole (Correct Answer)
C. Intravenous steroids and sulphasalazine
D. Hydrocortisone enemas

Explanation: ### Explanation **Diagnosis: Intestinal Amoebiasis** The pathognomonic finding in this clinical scenario is the **"flask-shaped ulcer."** This is the classic histological description of ulcers caused by ***Entamoeba histolytica***. The organism penetrates the colonic mucosa and spreads laterally in the submucosa, creating a narrow neck and a broad base (resembling a flask). **1. Why Option B is Correct:** The treatment of choice for invasive intestinal amoebiasis is a **nitroimidazole**, such as **Metronidazole** or Tinidazole. These are luminal and tissue amoebicides that effectively eradicate the trophozoites. In cases of severe gastrointestinal bleeding or systemic symptoms, intravenous administration is preferred to ensure adequate bioavailability. **2. Why Other Options are Incorrect:** * **Option A (Ceftriaxone):** This is a third-generation cephalosporin used for bacterial infections (e.g., Typhoid fever or Shigellosis). While these can cause ulcers, they do not produce the characteristic flask-shaped morphology. * **Option C & D (Steroids/Sulphasalazine/Enemas):** These are treatments for **Inflammatory Bowel Disease (IBD)**, specifically Ulcerative Colitis [2]. While IBD presents with bloody diarrhea and ulcers, the biopsy would show crypt abscesses and architectural distortion, not flask-shaped ulcers [3]. *Crucially, giving steroids in amoebiasis can lead to toxic megacolon or perforation.* **3. NEET-PG High-Yield Pearls:** * **Site:** The most common site for intestinal amoebiasis is the **Cecum** and ascending colon, followed by the sigmoid colon [1]. * **Microscopy:** Look for trophozoites containing **ingested RBCs** (erythrophagocytosis) in the stool or biopsy. * **Complication:** The most common extra-intestinal manifestation is an **Amoebic Liver Abscess** (typically in the right lobe; "anchovy sauce" pus) [1]. * **Treatment Sequence:** Always follow Metronidazole with a **luminal amoebicide** (e.g., Paromomycin or Diloxanide furoate) to eradicate cysts and prevent relapse.

Question 827: A 20-year-old woman presents with a 2-year history of difficulty swallowing and increasing fatigue. A CBC shows iron-deficiency anemia. Upper endoscopy reveals an annular narrowing in the upper third of the esophagus. A mucosal biopsy shows no evidence of inflammation or neoplasia. Which of the following is the most likely diagnosis?

A. Achalasia
B. Barrett esophagus
C. Diverticulum
D. Esophageal web (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Esophageal Web** **1. Why it is correct:** The clinical presentation describes the classic triad of **Plummer-Vinson Syndrome** (also known as Paterson-Brown-Kelly Syndrome), which consists of: * **Iron-deficiency anemia** (fatigue, low hemoglobin). * **Dysphagia** (difficulty swallowing). * **Esophageal webs** (annular narrowing in the upper esophagus). Esophageal webs are thin, eccentric, mucosal protrusions most commonly found in the **upper third** of the esophagus. Histologically, they consist of squamous epithelium and vascularized connective tissue without inflammation or malignancy, matching the biopsy findings. **2. Why other options are incorrect:** * **A. Achalasia:** Characterized by failure of the Lower Esophageal Sphincter (LES) to relax and aperistalsis [2]. It typically presents with dysphagia to both solids and liquids and involves the **distal** esophagus, not the upper third. * **B. Barrett Esophagus:** This is intestinal metaplasia of the **distal** esophagus due to chronic GERD. It does not typically cause upper esophageal narrowing or iron-deficiency anemia unless a significant ulcer or malignancy develops. * **C. Diverticulum:** While a Zenker’s diverticulum occurs in the upper esophagus, it is an outpouching (not an annular narrowing) and usually presents with halitosis and regurgitation of undigested food [2]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Plummer-Vinson Syndrome (PVS):** Most common in middle-aged women. * **Risk of Malignancy:** PVS is a premalignant condition; it increases the risk of **Squamous Cell Carcinoma** of the esophagus and pharynx. * **Diagnosis:** Barium swallow is often more sensitive than endoscopy for detecting thin webs [3]. * **Treatment:** Iron supplementation often improves the dysphagia; severe cases require endoscopic dilation [1].

Question 828: Which of the following is not a feature of non-cirrhotic portal hypertension?

A. Ascites (Correct Answer)
B. Hematemesis
C. Splenomegaly
D. All are seen

Explanation: **Explanation:** Non-cirrhotic portal hypertension (NCPH) refers to a group of disorders characterized by increased portal pressure in the absence of cirrhosis. The hallmark of NCPH is **preserved liver synthetic function** and a normal hepatic venous pressure gradient (HVPG). **1. Why Ascites is the correct answer:** In NCPH, the site of resistance to portal flow is usually **pre-sinusoidal** (e.g., Non-cirrhotic portal fibrosis or Extrahepatic portal vein obstruction). Because the resistance occurs before the sinusoids, the sinusoidal pressure remains relatively normal. Ascites typically requires high sinusoidal pressure and hypoalbuminemia (due to liver failure) to develop. Therefore, **ascites is conspicuously absent** [1] or only transiently seen after a major variceal bleed. **2. Analysis of Incorrect Options:** * **B. Hematemesis:** This is a common presentation of NCPH. Increased portal pressure leads to the development of gastroesophageal varices. Since liver function is preserved, these patients tolerate bleeds better than cirrhotic patients but often present with massive hematemesis. * **C. Splenomegaly:** This is a cardinal feature of NCPH. Congestive splenomegaly is often massive and is frequently the first clinical sign, often accompanied by hypersplenism (thrombocytopenia/leukopenia). **Clinical Pearls for NEET-PG:** * **Key Examples of NCPH:** Non-cirrhotic portal fibrosis (NCPF), Extrahepatic portal vein obstruction (EHPVO), and Schistosomiasis. * **Differentiating Feature:** In NCPH, Liver Function Tests (LFTs) and liver biopsy (architecture) are typically **normal**. * **HVPG:** In pre-sinusoidal NCPH, the HVPG (Hepatic Venous Pressure Gradient) is usually normal [2] or low, despite the presence of clinical portal hypertension.

Question 829: Steakhouse syndrome or intermittent food impaction is due to which of the following anomalies?

A. Schatzki ring (Correct Answer)
B. Feline esophagus
C. Achalasia cardia
D. Esophageal carcinoma

Explanation: ### **Explanation** **Schatzki Ring (Correct Answer):** Steakhouse syndrome refers to acute esophageal food impaction, typically caused by a large, poorly chewed piece of meat. The most common underlying structural cause is a **Schatzki ring**. This is a smooth, benign, circumferential mucosal thinning located at the squamocolumnar junction (lower esophagus). It characteristically presents with **intermittent episodic dysphagia** to solids only. When the luminal diameter is <13 mm, food impaction is highly likely. **Analysis of Incorrect Options:** * **Feline Esophagus:** This is a transient endoscopic finding of multiple horizontal mucosal folds (resembling a cat's esophagus), usually associated with Gastroesophageal Reflux Disease (GERD) or Eosinophilic Esophagitis. It does not typically cause acute food impaction. * **Achalasia Cardia:** This is a motility disorder characterized by failure of the Lower Esophageal Sphincter (LES) to relax [1]. It presents with **progressive dysphagia** to both solids and liquids, rather than the sudden, intermittent impaction seen in Steakhouse syndrome [1]. * **Esophageal Carcinoma:** This presents with **progressive, persistent dysphagia** (solids followed by liquids) accompanied by significant weight loss and constitutional symptoms, unlike the episodic nature of Schatzki rings. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Schatzki rings are always found at the **B-line** (squamocolumnar junction). * **Association:** Frequently associated with **Hiatal Hernia**. * **Diagnosis:** Barium swallow is often more sensitive than endoscopy for detection. * **Management:** Reassurance, chewing food thoroughly, and endoscopic dilation if symptoms persist.

Question 830: The "corkscrew appearance" is characteristic of which of the following conditions?

A. Carcinoma of the esophagus
B. Hypertrophic pyloric stenosis
C. Diffuse esophageal spasm (Correct Answer)
D. Sigmoid volvulus

Explanation: The **"corkscrew appearance"** on a barium swallow is the classic radiological hallmark of **Diffuse Esophageal Spasm (DES)**. **Why it occurs:** DES is a motility disorder characterized by uncoordinated, non-peristaltic, and high-amplitude contractions of the esophageal smooth muscle [1]. These simultaneous contractions compartmentalize the esophagus, creating multiple tertiary waves that appear as "beading" or a "corkscrew" on imaging [1]. Patients typically present with intermittent chest pain (mimicking angina) and dysphagia to both solids and liquids [1]. **Analysis of Incorrect Options:** * **Carcinoma of the esophagus:** Typically presents with a **"rat-tail"** appearance (irregular narrowing) or an **"apple-core"** lesion (annular constriction) due to malignant infiltration [3]. * **Hypertrophic pyloric stenosis:** Characterized by the **"string sign"** (narrowed pyloric canal) or **"beak sign"** on barium studies, and a "doughnut" or "target" sign on ultrasound. * **Sigmoid volvulus:** Presents on an abdominal X-ray as a **"coffee bean"** sign or an **"omega"** sign; on a barium enema, it shows a **"bird’s beak"** deformity at the site of the twist. **NEET-PG High-Yield Pearls:** * **Manometry** is the gold standard for diagnosing DES (showing >20% premature contractions) [1]. * **Nutcracker Esophagus:** High-amplitude *peristaltic* contractions (unlike the uncoordinated contractions in DES) [1]. * **Bird’s Beak Appearance:** Classic for **Achalasia Cardia** (failure of LES relaxation) [2]. * **Treatment of DES:** Nitrates, Calcium Channel Blockers (CCBs), or Botulinum toxin injection to relax the smooth muscle [1].

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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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