Gastroenterology Practice Questions

Q: Which of the following statements about acute hepatitis is true?

Anti-HCV antibodies are never present in 10% of cases.. The correct answer is **Option B**. In approximately **10% of acute Hepatitis C (HCV) cases**, anti-HCV antibodies are never detectable during the acute phase of the illness. This occurs because the "window period" for antibody seroconversion can be prolonged (averaging 7–8 weeks) [1]. In these patients, the diagnosis must be confirmed by detecting **HCV RNA** using PCR, which is the earliest marker of infection [1]. **Analysis of Incorrect Options:** * **Option A:** Worldwide, **Genotype 1** is the most prevalent HCV genotype (approx. 46%), followed by Genotype 3 [1]. In India, Genotype 3 is the most common. * **Option C:** While HEV is a major cause of epidemics in developing countries, **Hepatitis A (HAV)** is globally the most common cause of acute viral hepatitis, especially in the pediatric population [2]. * **Option D:** HAV is significantly **more common in children** [2]. In endemic areas like India, most children are exposed early in life, often resulting in asymptomatic or mild infections, leading to lifelong immunity before reaching adulthood. **High-Yield Clinical Pearls for NEET-PG:** * **HCV Diagnosis:** HCV RNA is the gold standard for diagnosing acute infection; Anti-HCV indicates exposure but cannot distinguish between acute, chronic, or resolved infection [1]. * **HEV & Pregnancy:** HEV carries a high mortality rate (up to 20%) in pregnant women, particularly in the third trimester, due to fulminant hepatic failure. * **Hepatitis B:** The first serological marker to appear is **HBsAg**, while the first antibody to appear is **Anti-HBc (IgM)**.

Q: A 40-year-old male presented with watery diarrhea. Stool cytotoxin assay was positive. Colonoscopy revealed ulcers, plaques, and pseudomembranes. The patient's condition improved significantly with metronidazole. The provided CECT shows a characteristic sign. What is the name of this sign seen on CECT?

Accordion sign. ***Accordion sign*** - The **accordion sign** on CECT represents **oral contrast trapped between thickened, edematous haustra** in **pseudomembranous colitis**, creating alternating bands of high and low attenuation resembling an accordion. - This sign is **pathognomonic for C. difficile colitis** and correlates with severe mucosal inflammation and **pseudomembrane formation** seen on colonoscopy. *Central stellate scar* - This is a characteristic finding of **focal nodular hyperplasia (FNH)** of the liver, showing a **central fibrous scar** with radiating septa. - It has no association with **colonic pathology** or **C. difficile infection**. *Whorl sign* - The **whorl sign** is seen in **intestinal volvulus**, particularly **sigmoid volvulus**, showing a **twisted bowel loop** with a characteristic spiral appearance. - It indicates **mechanical bowel obstruction**, not infectious colitis with **pseudomembrane formation**. *Honeycombing* - **Honeycombing** is a **pulmonary imaging finding** seen in **end-stage pulmonary fibrosis**, showing clustered cystic spaces in subpleural regions. - It is completely unrelated to **gastrointestinal pathology** and **C. difficile colitis**.

Q: Poor prognostic factors for acute pancreatitis are all, EXCEPT:

Hyperamylasemia. **Explanation:** In acute pancreatitis, the **severity of the disease does not correlate with the magnitude of serum amylase or lipase elevation.** While hyperamylasemia is a diagnostic hallmark, it has no prognostic value. A patient with mild interstitial pancreatitis may have amylase levels >3000 U/L, while a patient with severe necrotizing pancreatitis may have near-normal levels due to extensive pancreatic destruction or hypertriglyceridemia. **Analysis of Options:** * **Hyperamylasemia (Correct Answer):** As stated, it is useful for diagnosis (if >3x upper limit) but does not predict complications or mortality. * **Hyperglycemia:** Included in the **Ranson Criteria** (>200 mg/dL) and **APACHE II** scores. It reflects endocrine pancreatic dysfunction and systemic stress. * **Hypocalcemia:** A sign of severe disease (Ranson’s: 350 IU/L). **Clinical Pearls for NEET-PG:** 1. **Ranson Criteria:** Assessed at admission and 48 hours. Remember the mnemonic **GAWBE** (Glucose, Age, WBC, AST, LDH) for admission. 2. **BISAP Score:** (BUN, Impaired mental status, SIRS, Age >60, Pleural effusion) is a rapid bedside tool. 3. **Most Accurate Marker:** Contrast-Enhanced CT (CECT) is the gold standard for assessing necrosis (best done after 72 hours). 4. **Early Prognosis:** Rising **Hematocrit** (indicating hemoconcentration) and **BUN** are the most reliable early indicators of poor prognosis.

Q: A 52-year-old woman is experiencing abdominal discomfort after meals and early in the morning. She has no weight loss or constitutional symptoms and has tried antacids with minimal relief. Upper endoscopy reveals a duodenal ulcer, and the biopsy is negative for malignancy. What is the most appropriate next step in management?

Antibiotic therapy and omeprazole. The patient presents with a classic duodenal ulcer (DU). In the context of Peptic Ulcer Disease (PUD), the most critical management principle is addressing the underlying etiology [1]. **1. Why Option D is Correct:** Over 90% of duodenal ulcers are associated with *Helicobacter pylori* infection [1]. Current guidelines dictate that if a duodenal ulcer is diagnosed, the patient should be treated for *H. pylori* eradication, even if specific testing (like RUT or histology) isn't explicitly mentioned, as the association is near-universal. The standard of care is **Triple Therapy**, which combines a Proton Pump Inhibitor (PPI) like **Omeprazole** (to promote mucosal healing and symptom relief) with **Antibiotics** (typically Clarithromycin and Amoxicillin/Metronidazole) to eradicate the bacteria and prevent ulcer recurrence [1]. **2. Why Other Options are Incorrect:** * **Option A & B:** While PPIs (Omeprazole) or H2 blockers (Ranitidine) provide symptomatic relief and heal the current ulcer, they do not address the *H. pylori* infection. Without antibiotics, the recurrence rate of duodenal ulcers is over 70-80% within a year [1]. * **Option C:** Antibiotics alone are insufficient because they do not provide the rapid acid suppression required for immediate pain relief and optimal mucosal healing. **High-Yield Clinical Pearls for NEET-PG:** * **DU vs. GU:** Duodenal ulcers are almost always benign (biopsy for malignancy is usually not required, unlike Gastric Ulcers) [2]. * **Pain Pattern:** DU pain typically occurs 2-3 hours after meals or at night (nocturnal pain) and is often **relieved by food**. * **Investigation of Choice:** Upper GI Endoscopy (UGIE). * **Eradication Confirmation:** Always check for successful eradication at least 4 weeks after completing therapy using a Urea Breath Test or Stool Antigen Test [1].

Q: A 25-year-old man presents with recurrent, indolent fistula in ano. He also reports weight loss, recurrent episodes of diarrhea with blood in the stool, and tenesmus. Proctoscopy reveals a healthy, normal-appearing rectum. What is the most likely diagnosis?

Crohn's colitis. ### Explanation The clinical presentation of a young patient with **recurrent, indolent fistula-in-ano** associated with systemic symptoms (weight loss) and gastrointestinal distress (bloody diarrhea) strongly suggests **Crohn’s Disease**. The pathognomonic clue in this question is the **"healthy, normal-appearing rectum"** on proctoscopy. This phenomenon is known as **Rectal Sparing**, which is a hallmark feature of Crohn’s disease. Crohn’s is characterized by transmural inflammation and "skip lesions," often involving the terminal ileum and the perianal region while leaving the rectum unaffected. Perianal complications (fistulae, fissures, abscesses) occur in up to 30% of Crohn’s patients. #### Why the other options are incorrect: * **Ulcerative Colitis (UC):** UC is characterized by continuous mucosal inflammation that **always involves the rectum** (proctitis). Rectal sparing is extremely rare in UC. Furthermore, perianal fistulae are not a feature of UC. * **Amoebic Colitis:** While it causes bloody diarrhea and tenesmus, it typically presents as an acute or subacute infection. It does not cause chronic, indolent perianal fistulae or rectal sparing. * **Ischemic Colitis:** This usually occurs in elderly patients with cardiovascular risk factors. It typically affects the "watershed areas" (splenic flexure) and presents with sudden onset abdominal pain and hematochezia, not chronic fistulae. #### NEET-PG High-Yield Pearls: * **Rectal Sparing:** Classic sign of Crohn’s Disease. * **Fistula-in-ano:** When recurrent or complex, always rule out Crohn’s. * **Transmural Inflammation:** Leads to the "String sign of Kantor" (barium study) and "Creeping fat" (gross pathology). * **Cobblestone Appearance:** Due to deep longitudinal ulcers and intervening normal mucosa. * **Non-caseating Granulomas:** The characteristic histological finding in Crohn’s (absent in UC).

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].

Question 1

Which of the following statements about acute hepatitis is true?

Accepted Answer

Anti-HCV antibodies are never present in 10% of cases.

Answer

In Hepatitis C virus (HCV) infection, genotypes 2 and 3 are the most prevalent worldwide.

Answer

Hepatitis E virus (HEV) is the commonest cause of acute hepatitis.

Answer

Hepatitis A virus (HAV) is more common in adults than in children.

Question 2

A 40-year-old male presented with watery diarrhea. Stool cytotoxin assay was positive. Colonoscopy revealed ulcers, plaques, and pseudomembranes. The patient's condition improved significantly with metronidazole. The provided CECT shows a characteristic sign. What is the name of this sign seen on CECT?

Accepted Answer

Accordion sign

Answer

Central stellate scar

Answer

Whorl sign

Answer

Honeycombing

Question 3

Poor prognostic factors for acute pancreatitis are all, EXCEPT:

Accepted Answer

Hyperamylasemia

Answer

Hyperglycemia

Answer

Hypocalcemia

Answer

Raised LDH levels in blood

Question 4

A 52-year-old woman is experiencing abdominal discomfort after meals and early in the morning. She has no weight loss or constitutional symptoms and has tried antacids with minimal relief. Upper endoscopy reveals a duodenal ulcer, and the biopsy is negative for malignancy. What is the most appropriate next step in management?

Accepted Answer

Antibiotic therapy and omeprazole

Answer

6-8 weeks of omeprazole or ranitidine

Answer

Long-term acid suppression with omeprazole

Answer

Antibiotic therapy

Question 5

A 25-year-old man presents with recurrent, indolent fistula in ano. He also reports weight loss, recurrent episodes of diarrhea with blood in the stool, and tenesmus. Proctoscopy reveals a healthy, normal-appearing rectum. What is the most likely diagnosis?

Accepted Answer

Crohn's colitis

Answer

Ulcerative colitis

Answer

Amoebic colitis

Answer

Ischemic colitis

Question 6

A 60-year-old male presents with progressive difficulty in swallowing, vomiting, and occasional regurgitation for the past 3 months. Barium studies showed marked dilatation of the upper esophagus with narrowing of the lower segment. Manometry showed absent esophageal peristalsis. What is a likely complication this patient would present with?

Accepted Answer

Recurrent chest infection

Answer

Recurrent upper gastrointestinal bleeding

Answer

Recurrent colicky abdominal pain

Answer

Esophageal perforation

Question 7

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 8

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 9

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 10

What is the most important pathophysiological cause of GERD?

Accepted Answer

Transient LES relaxation

Answer

Hiatus hernia

Answer

LES hypotension

Answer

Inadequate esophageal clearance

Gastroenterology — MCQs

Gastroenterology — MCQs

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