Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 351: 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 352: 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 353: 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 354: 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 355: 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 356: 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 357: 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 358: 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 359: 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.

Question 360: What is true about ulcerative colitis?

A. Involves the rectum and then extends proximally throughout the colon. (Correct Answer)
B. Involves only the colon.
C. Skip lesions are seen.
D. The ileum is not involved.

Explanation: **Explanation:** Ulcerative Colitis (UC) is a chronic inflammatory bowel disease characterized by diffuse, mucosal inflammation limited to the colon [1]. **1. Why Option A is correct:** The hallmark of UC is its **continuous and symmetrical** involvement. It almost always starts in the **rectum (proctitis)** and extends proximally in a retrograde fashion to involve the sigmoid, descending, or the entire colon (pancolitis) [1]. Unlike Crohn’s disease, there are no healthy areas of bowel between inflamed segments. **2. Why the other options are incorrect:** * **Option B:** While UC primarily affects the colon, it is not strictly "only" the colon. In cases of pancolitis, the terminal ileum can show superficial inflammation known as **"backwash ileitis"** (seen in ~10-20% of cases). * **Option C:** **Skip lesions** are a characteristic feature of **Crohn’s disease**, where areas of disease are separated by normal-appearing mucosa [1]. UC is strictly continuous. * **Option D:** As mentioned above, the ileum can be involved via **backwash ileitis**. Therefore, saying the ileum is "not involved" is factually incorrect in the context of advanced pancolitis. **High-Yield Clinical Pearls for NEET-PG:** * **Depth of Involvement:** Limited to the **mucosa and submucosa** (Crohn’s is transmural) [1]. * **Microscopy:** Presence of **Crypt abscesses** and crypt distortion [1]. * **Smoking Paradox:** Smoking is actually **protective** in UC (but a risk factor for Crohn’s). * **Serology:** **p-ANCA** is positive in 60-70% of UC patients. * **Complications:** Toxic megacolon and a significantly higher risk of **Colorectal Carcinoma** compared to Crohn’s [1]. * **Lead Pipe Appearance:** Seen on barium enema due to loss of haustrations in chronic cases.

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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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