Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 351: Zollinger Ellison Syndrome is diagnosed if serum gastrin level is greater than:

A. 100 pg/ml
B. 500 pg/ml
C. 1000 pg/ml (Correct Answer)
D. 5000 pg/ml

Explanation: **Explanation:** Zollinger-Ellison Syndrome (ZES) is caused by a gastrin-secreting tumor (gastrinoma), typically located in the "gastrinoma triangle." The hallmark of ZES is hypergastrinemia leading to excessive gastric acid secretion and refractory peptic ulcers [1]. **Why 1000 pg/ml is the correct answer:** The diagnosis of ZES is highly likely when the fasting serum gastrin (FSG) level is **>1000 pg/ml** (10 times the upper limit of normal) in the presence of a gastric pH < 2.0. This level is considered diagnostic and usually bypasses the need for further provocative testing like the Secretin Stimulation Test. **Analysis of Incorrect Options:** * **A (100 pg/ml):** This is within the normal range for fasting serum gastrin (typically <100-150 pg/ml). * **B (500 pg/ml):** While elevated, levels between 200–1000 pg/ml are non-specific. They can be seen in ZES but also in conditions like atrophic gastritis, Pernicious anemia, or chronic Proton Pump Inhibitor (PPI) use [1]. In this range, a Secretin Stimulation Test is required for confirmation. * **D (5000 pg/ml):** While this level certainly confirms ZES, it is far beyond the minimum threshold required for diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common location:** The Gastrinoma Triangle (Passaro’s Triangle). * **Association:** 25% of cases are associated with **MEN-1 syndrome** (3Ps: Parathyroid, Pancreas, Pituitary). * **Confirmatory Test:** If gastrin is elevated but <1000 pg/ml, the **Secretin Stimulation Test** is the most sensitive test (ZES shows an increase in gastrin >200 pg/ml). * **Localization:** Somatostatin Receptor Scintigraphy (SRS) or 68Ga-DOTATATE PET/CT are the preferred imaging modalities.

Question 352: A 35-year-old patient has an abnormal Schilling test. After 5 days of antibiotic treatment, the Schilling test normalizes. What is the most likely diagnosis?

A. Bacterial overgrowth syndrome (Correct Answer)
B. Chronic pancreatitis
C. Atrophic gastritis
D. Ileocecal tuberculosis

Explanation: ### Explanation The **Schilling test** is used to determine the cause of Vitamin B12 (cobalamin) malabsorption. The test is performed in stages to localize the pathology. **1. Why Bacterial Overgrowth Syndrome (SIBO) is correct:** In Small Intestinal Bacterial Overgrowth (SIBO), excess bacteria in the proximal small bowel compete with the host for Vitamin B12 [1]. These bacteria bind and metabolize the B12-Intrinsic Factor (IF) complex before it can reach the terminal ileum for absorption [2]. This results in an abnormal initial Schilling test. When the patient is treated with **broad-spectrum antibiotics** (e.g., tetracycline or rifaximin), the bacterial population is reduced, allowing the B12-IF complex to be absorbed normally, thus **normalizing the test**. **2. Why the other options are incorrect:** * **Chronic Pancreatitis:** Pancreatic enzymes are required to cleave B12 from R-binders. While this causes malabsorption, it would normalize only after **pancreatic enzyme supplementation**, not antibiotics. * **Atrophic Gastritis:** This leads to a deficiency of Intrinsic Factor (Pernicious Anemia) [1]. The Schilling test would normalize only after the administration of **oral Intrinsic Factor** (Stage II). * **Ileocecal Tuberculosis:** This involves structural damage or resection of the terminal ileum (the site of B12 absorption). Antibiotics do not acutely reverse ileal damage; therefore, the test would remain abnormal. **Clinical Pearls for NEET-PG:** * **Stage I:** B12 alone (Abnormal in all the above conditions). * **Stage II:** B12 + Intrinsic Factor (Normalizes in **Pernicious Anemia**). * **Stage III:** B12 + Antibiotics (Normalizes in **SIBO**). * **Stage IV:** B12 + Pancreatic enzymes (Normalizes in **Chronic Pancreatitis**). * **High-Yield:** SIBO is often associated with "Blind Loop Syndrome" or motility disorders like Scleroderma [1].

Question 353: A patient presents with esophageal varices and a liver span of 10cm. All of the following are likely causes, except:

A. Haemochromatosis
B. Alcoholic liver disease
C. Veno-occlusive disease
D. Post necrotic cirrhosis (Correct Answer)

Explanation: The core of this question lies in assessing the **liver size** in the context of portal hypertension (esophageal varices) [2]. A liver span of 10 cm is considered **normal** (normal range is 8–12 cm). Therefore, the question asks which of the listed conditions typically presents with a **shrunken or small liver** rather than a normal or enlarged one. **Why Post-necrotic Cirrhosis is the Correct Answer:** Post-necrotic cirrhosis (often the end-stage of chronic viral hepatitis B or C) is characterized by extensive parenchymal destruction and collapse. This leads to significant scarring and architectural distortion, resulting in a **small, shrunken, and nodular liver**. While it causes esophageal varices due to portal hypertension, the liver span would typically be significantly less than 10 cm. **Analysis of Incorrect Options:** * **Haemochromatosis:** This is an infiltrative/storage disorder. Iron deposition leads to significant **hepatomegaly** (enlarged liver) in the early and middle stages, often maintaining a span >12 cm even when varices develop. * **Alcoholic Liver Disease:** In the stages of fatty liver or alcoholic hepatitis, the liver is typically **enlarged** due to steatosis and inflammation. Even in early alcoholic cirrhosis, the liver may remain normal-sized or enlarged before eventually shrinking in terminal stages. * **Veno-occlusive Disease (Sinusoidal Obstruction Syndrome):** This involves post-sinusoidal obstruction [1]. It classically presents with the triad of **hepatomegaly**, ascites, and jaundice. The liver is congested and enlarged. **NEET-PG High-Yield Pearls:** * **Small Liver Cirrhosis:** Post-necrotic cirrhosis, late-stage Laennec’s (alcoholic) cirrhosis. * **Large Liver Cirrhosis:** Haemochromatosis, Primary Biliary Cholangitis (PBC), Wilson’s disease (early), and Nonalcoholic Steatohepatitis (NASH) [2]. * **Normal Liver Span:** 8–12 cm (MCD) via percussion in the mid-clavicular line. * **Cruveilhier-Baumgarten Syndrome:** A clinical sign of portal hypertension where a venous hum is heard over the epigastrium due to recanalization of the umbilical vein.

Question 354: What is the most important pathophysiological cause of GERD?

A. Hiatus hernia
B. Transient LES relaxation (Correct Answer)
C. LES hypotension
D. Inadequate esophageal clearance

Explanation: **Explanation:** The primary pathophysiological mechanism behind Gastroesophageal Reflux Disease (GERD) is the **Transient Lower Esophageal Sphincter Relaxation (TLESR)** [2]. **1. Why Transient LES Relaxation is Correct:** In most patients, especially those with mild-to-moderate disease, the resting LES pressure is actually normal. Reflux occurs during TLESRs—spontaneous, swallow-independent relaxations of the LES that are triggered by gastric distension (mediated by the vagus nerve) [2]. These relaxations allow gastric contents to enter the esophagus. While TLESRs are a physiological mechanism to allow gas to escape (belching), they are more frequent or prolonged in patients with GERD. **2. Analysis of Incorrect Options:** * **Hiatus Hernia (A):** While a common association, it is a structural anatomical defect rather than the primary functional cause [1]. It contributes to GERD by displacing the LES into the thorax, but many people with hiatus hernia do not have GERD [1]. * **LES Hypotension (C):** Low resting LES pressure (hypotension) is a significant factor, particularly in severe cases or scleroderma, but it is not the *most common* cause across the general population of GERD patients [2]. * **Inadequate Esophageal Clearance (D):** This refers to poor peristalsis or reduced salivation (which neutralizes acid). This is a *contributory* factor that prolongs acid exposure but is not the initiating cause of the reflux event itself [1]. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** 24-hour ambulatory pH monitoring (specifically the DeMeester score). * **Most Common Symptom:** Heartburn (Pyrosis). * **Barrett’s Esophagus:** A complication where squamous epithelium undergoes intestinal metaplasia (columnar cells with Goblet cells), increasing the risk of Adenocarcinoma [1]. * **First-line Management:** Lifestyle modifications and Proton Pump Inhibitors (PPIs) [2].

Question 355: What is the most important investigation for the diagnosis of Zollinger-Ellison syndrome?

A. Ca2+ infusion test
B. Secretin injection test (Correct Answer)
C. ACTH stimulation test
D. Steroid assay

Explanation: **Zollinger-Ellison Syndrome (ZES)** is caused by a gastrin-secreting neuroendocrine tumor (gastrinoma), leading to severe peptic ulcer disease and diarrhea. **Why Secretin Injection Test is the Correct Answer:** The **Secretin stimulation test** is the most sensitive and specific provocative test for diagnosing ZES. Under normal physiological conditions, secretin inhibits gastric acid secretion and gastrin release from G-cells. However, in patients with a gastrinoma, secretin paradoxically stimulates the tumor cells to release large amounts of gastrin. A rise in serum gastrin levels of **>200 pg/mL** above the baseline after secretin injection is diagnostic of ZES. **Analysis of Incorrect Options:** * **A. Ca2+ infusion test:** While calcium infusion also stimulates gastrin release from gastrinomas, it is less sensitive and more time-consuming than the secretin test. It is generally reserved for cases where ZES is strongly suspected but the secretin test is negative. * **C. ACTH stimulation test:** This is used to evaluate adrenal insufficiency (Addison’s disease) or to localize the source of excess cortisol in Cushing’s syndrome [1]. It has no role in diagnosing gastrinomas. * **D. Steroid assay:** This measures levels of adrenal or gonadal hormones and is irrelevant to the diagnosis of acid-peptic disorders or gastrin-secreting tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Screening:** The first step in diagnosis is measuring **Fasting Serum Gastrin (FSG)** levels (usually >1000 pg/mL is diagnostic) [2]. * **Gastric pH:** To confirm ZES, FSG must be measured alongside **gastric pH**; a pH ≤ 2.0 is required to rule out secondary hypergastrinemia (e.g., due to PPI use or atrophic gastritis). * **Localization:** Once biochemically confirmed, **Somatostatin Receptor Scintigraphy (Octreotide scan)** or Endoscopic Ultrasound (EUS) is used to locate the tumor. * **Association:** Approximately 25% of ZES cases occur as part of **Multiple Endocrine Neoplasia type 1 (MEN1)**.

Question 356: Which of the following is associated with Autoimmune hepatitis?

A. Anti LKM antibody (Correct Answer)
B. ANA
C. ANCA
D. SLA-antibody

Explanation: **Explanation:** Autoimmune Hepatitis (AIH) is a chronic inflammatory liver disease characterized by elevated serum globulins and the presence of specific autoantibodies [1]. It is broadly classified into two types based on serological markers: * **Type 1 AIH:** The most common form, typically seen in adults [1]. It is associated with **ANA (Anti-nuclear antibody)** and/or **ASMA (Anti-smooth muscle antibody)**. * **Type 2 AIH:** More common in children and adolescents. It is characterized by the presence of **Anti-LKM1 (Liver-Kidney Microsomal type 1)** antibodies and/or **Anti-LC1 (Liver Cytosol type 1)** antibodies. **Analysis of Options:** * **A. Anti LKM antibody (Correct):** This is the hallmark marker for Type 2 AIH. It targets the cytochrome P450 2D6 enzyme. * **B, C, & D (Incorrect in context):** While ANA (Option B), ANCA (Option C - specifically p-ANCA), and SLA/LP (Option D - Soluble Liver Antigen) are all associated with AIH, the question asks "which is associated" in a single-best-answer format [3]. In many standard NEET-PG patterns, Anti-LKM is frequently tested as the specific differentiator for Type 2 AIH. *Note: Technically, all four options can be associated with AIH; however, Anti-LKM is a classic high-yield diagnostic marker.* **High-Yield Clinical Pearls for NEET-PG:** 1. **Type 1 AIH:** ANA (+), ASMA (+), HLA-DR3/DR4 association. 2. **Type 2 AIH:** Anti-LKM1 (+), Anti-LC1 (+), more aggressive clinical course. 3. **SLA/LP Antibody:** The most specific marker for AIH; patients are often ANA/ASMA negative. 4. **Treatment:** Corticosteroids (Prednisolone) are the mainstay, often combined with Azathioprine [2]. 5. **Histology:** Look for **"Interface Hepatitis"** (piecemeal necrosis) and plasma cell infiltration [2].

Question 357: Crohn's disease is associated with which gene?

A. NOD-2/CARD-15 gene (Correct Answer)
B. P53 suppressor gene
C. Philadelphia chromosome
D. BRCA-1 gene

Explanation: **Explanation:** **1. Correct Option: A (NOD-2/CARD-15 gene)** Crohn’s disease (CD) has a strong genetic predisposition. The most strongly associated gene is **NOD2 (Nucleotide-binding Oligomerization Domain 2)**, also known as **CARD15**, located on **chromosome 16**. * **Mechanism:** NOD2 encodes an intracellular receptor that recognizes bacterial peptidoglycans (muramyl dipeptide). * **Pathophysiology:** Mutations in this gene lead to a defective innate immune response to luminal bacteria, resulting in chronic, transmural inflammation characteristic of Crohn's disease [1]. It is particularly associated with **ileal involvement** and a fibrostenosing clinical phenotype. **2. Incorrect Options:** * **B. P53 suppressor gene:** This is the "guardian of the genome." Mutations are associated with various malignancies (e.g., Li-Fraumeni syndrome) [2] and the progression of the adenoma-carcinoma sequence in colorectal cancer, but not specifically with the etiology of IBD. * **C. Philadelphia chromosome:** This refers to the **t(9;22)** translocation resulting in the BCR-ABL fusion protein, which is the hallmark of **Chronic Myeloid Leukemia (CML)** and some cases of ALL. * **D. BRCA-1 gene:** This is a DNA repair gene associated with hereditary **breast and ovarian cancer** syndromes. **3. High-Yield Clinical Pearls for NEET-PG:** * **IBD Genetics:** While NOD2 is specific to Crohn's, the **HLA-B27** association is common to both CD and UC, especially in patients with associated ankylosing spondylitis. * **Smoking:** It is a risk factor for **Crohn’s disease** but serves as a protective factor for **Ulcerative Colitis**. * **ASCA vs. p-ANCA:** Crohn’s is typically **ASCA positive**, whereas Ulcerative Colitis is **p-ANCA positive**. * **Granulomas:** The presence of non-caseating granulomas is a pathognomonic histological feature of Crohn’s disease.

Question 358: All of the following are important clinical manifestations of hepatocellular carcinoma EXCEPT?

A. Jaundice (Correct Answer)
B. Abdominal pain
C. Abdominal mass
D. Ascites

Explanation: Hepatocellular Carcinoma (HCC) typically arises in the setting of chronic liver disease or cirrhosis. While it presents with several systemic and localized symptoms, **Jaundice (Option A)** is considered an **uncommon** or late manifestation of the tumor itself [1, 2]. When jaundice occurs in an HCC patient, it is usually due to underlying end-stage cirrhosis or massive tumor infiltration causing biliary obstruction, rather than being a primary presenting feature of the malignancy [1]. **Analysis of other options:** * **Abdominal Pain (Option B):** This is the most common presenting symptom. It is usually a dull, aching pain in the right upper quadrant caused by the rapid expansion of the liver capsule. * **Abdominal Mass (Option C):** A palpable, firm, and irregular liver mass or generalized hepatomegaly is a classic physical finding in HCC [2]. * **Ascites (Option D):** The sudden development of ascites or the rapid worsening of pre-existing ascites in a stable cirrhotic patient is a high-yield clinical "red flag" for the development of HCC [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common symptom:** Abdominal pain. * **Most common sign:** Hepatomegaly [2]. * **Paraneoplastic syndromes:** HCC is associated with erythrocytosis (due to EPO production), hypoglycemia, and hypercalcemia. * **Auscultation:** A hepatic bruit or friction rub over the liver is highly suggestive of HCC. * **Tumor Marker:** Alpha-fetoprotein (AFP) >400 ng/mL is highly suggestive, though not definitive. * **Triad of HCC:** RUQ pain, weight loss, and a palpable mass.

Question 359: Cobble stone appearance is seen in which of the following conditions?

A. Ulcerative colitis
B. Crohn's disease (Correct Answer)
C. Appendicitis
D. Carcinoma rectum

Explanation: The "cobblestone appearance" is a classic endoscopic and gross pathological hallmark of Crohn’s disease. This occurs due to the presence of **deep, longitudinal, and transverse aphthous ulcers** (fissures) that intersect with islands of **edematous, normal-looking mucosa** [1]. This creates a bumpy, irregular surface resembling a cobblestone street [1]. Unlike Ulcerative Colitis, Crohn’s is characterized by transmural inflammation and "skip lesions" [1]. **Why other options are incorrect:** * **Ulcerative Colitis:** This condition involves continuous, superficial mucosal inflammation [1]. Instead of cobblestoning, it typically presents with a **"lead pipe" appearance** (loss of haustrations) on imaging and **pseudopolyps** (regenerating mucosal islands) on endoscopy [1]. * **Appendicitis:** This is an acute inflammatory process usually presenting with a dilated appendix and periappendiceal fat stranding, not chronic mucosal remodeling like cobblestoning. * **Carcinoma Rectum:** This typically presents as a fungating mass, annular narrowing ("apple-core" lesion), or a malignant ulcer with raised, everted edges, rather than diffuse cobblestoning. **High-Yield Clinical Pearls for NEET-PG:** * **Transmural involvement:** Crohn’s affects all layers; UC is limited to the mucosa/submucosa [1]. * **String Sign of Kantor:** Seen on barium swallow in Crohn’s due to terminal ileal narrowing [2]. * **Granulomas:** Non-caseating granulomas are pathognomonic for Crohn’s (seen in ~40-60% of cases). * **Creeping Fat:** Mesenteric fat wrapping around the bowel is another specific gross finding in Crohn’s. * **ASCA vs. p-ANCA:** Crohn’s is associated with **ASCA** (Anti-Saccharomyces cerevisiae antibodies), while UC is associated with **p-ANCA**.

Question 360: What is the first-line treatment for a severe exacerbation of ulcerative colitis?

A. Sulfasalazine
B. Corticosteroids (Correct Answer)
C. Infliximab
D. Cyclosporine

Explanation: ### Explanation The management of Ulcerative Colitis (UC) is stratified based on the severity of the disease (Truelove and Witts criteria). For a **severe exacerbation**, the primary goal is to induce rapid remission and prevent complications like toxic megacolon. **1. Why Corticosteroids are the Correct Answer:** Systemic corticosteroids (e.g., IV Hydrocortisone or Methylprednisolone) are the **gold standard first-line therapy** for inducing remission in severe UC [1]. They possess potent anti-inflammatory properties that act rapidly to reduce mucosal inflammation. According to clinical guidelines, if a patient does not respond to IV steroids within 3–5 days, they are considered "steroid-refractory," and rescue therapy is initiated. **2. Analysis of Incorrect Options:** * **A. Sulfasalazine:** This is a 5-ASA compound used primarily for **maintenance** of remission or for treating **mild-to-moderate** active disease [1]. It is insufficient for severe exacerbations. * **C. Infliximab:** This is an anti-TNF agent used as **"rescue therapy"** if the patient fails to respond to initial IV corticosteroids. It is not the first-line choice. * **D. Cyclosporine:** Similar to Infliximab, this calcineurin inhibitor is reserved for **steroid-refractory** severe UC as a bridge to long-term maintenance therapy. **3. High-Yield Clinical Pearls for NEET-PG:** * **Truelove and Witts Criteria for Severe UC:** >6 bloody stools/day + systemic toxicity (Fever >37.8°C, Tachycardia >90 bpm, Anemia <10.5 g/dL, or ESR >30 mm/hr). * **Drug of Choice for Maintenance:** Mesalamine (5-ASA) is preferred over Sulfasalazine due to fewer side effects [1]. * **Toxic Megacolon:** A dreaded complication of severe UC; diagnosed when colonic dilatation is **>6 cm** on X-ray. * **Surgery:** Total proctocolectomy with Ileal Pouch-Anal Anastomosis (IPAA) is the curative surgical procedure of choice.

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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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