Gastroenterology Practice Questions

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

1000 pg/ml. **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 200 pg/ml). * **Localization:** Somatostatin Receptor Scintigraphy (SRS) or 68Ga-DOTATATE PET/CT are the preferred imaging modalities.

Q: 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?

Bacterial overgrowth syndrome. ### 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].

Q: What is the most important pathophysiological cause of GERD?

Transient LES relaxation. **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].

Q: Which of the following is associated with Autoimmune hepatitis?

Anti LKM antibody. **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].

Q: Crohn's disease is associated with which gene?

NOD-2/CARD-15 gene. **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.

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

Jaundice. 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.

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

Crohn's disease. 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**.

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

Corticosteroids. ### 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 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 1

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

Accepted Answer

1000 pg/ml

Answer

100 pg/ml

Answer

500 pg/ml

Answer

5000 pg/ml

Question 2

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?

Accepted Answer

Bacterial overgrowth syndrome

Answer

Chronic pancreatitis

Answer

Atrophic gastritis

Answer

Ileocecal tuberculosis

Question 3

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

Accepted Answer

Post necrotic cirrhosis

Answer

Haemochromatosis

Answer

Alcoholic liver disease

Answer

Veno-occlusive disease

Question 4

What is the most important pathophysiological cause of GERD?

Accepted Answer

Transient LES relaxation

Answer

Hiatus hernia

Answer

LES hypotension

Answer

Inadequate esophageal clearance

Question 5

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

Accepted Answer

Secretin injection test

Answer

Ca2+ infusion test

Answer

ACTH stimulation test

Answer

Steroid assay

Question 6

Which of the following is associated with Autoimmune hepatitis?

Accepted Answer

Anti LKM antibody

Answer

ANA

Answer

ANCA

Answer

SLA-antibody

Question 7

Crohn's disease is associated with which gene?

Accepted Answer

NOD-2/CARD-15 gene

Answer

P53 suppressor gene

Answer

Philadelphia chromosome

Answer

BRCA-1 gene

Question 8

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

Accepted Answer

Jaundice

Answer

Abdominal pain

Answer

Abdominal mass

Answer

Ascites

Question 9

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

Accepted Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Appendicitis

Answer

Carcinoma rectum

Question 10

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

Accepted Answer

Corticosteroids

Answer

Sulfasalazine

Answer

Infliximab

Answer

Cyclosporine

Gastroenterology — MCQs

Gastroenterology — MCQs

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