Gastroenterology Practice Questions

Q: Which of the following is the most appropriate diagnostic test for pancreatic insufficiency?

Faecal fat estimation. **Explanation:** **Pancreatic insufficiency** occurs when the exocrine pancreas fails to produce or secrete adequate digestive enzymes (lipase, protease, amylase), leading to malabsorption. Since dietary fats require pancreatic lipase for digestion, fat malabsorption is the hallmark of this condition. **Why Faecal Fat Estimation is Correct:** The **72-hour faecal fat estimation** is the gold standard for diagnosing and quantifying steatorrhea (excess fat in stools). It directly measures the functional consequence of lipase deficiency. A fat excretion of >7 grams/day (while on a 100g fat diet) confirms malabsorption, making it the most appropriate diagnostic test among the given options. **Analysis of Incorrect Options:** * **A. Schilling Test:** Historically used to diagnose Vitamin B12 malabsorption (Pernicious anemia vs. ileal disease). While pancreatic enzymes are needed to cleave R-binders from B12, it is not the primary test for pancreatic function. * **B & C. Serum Lipase and Amylase:** These are markers of **acute pancreatic injury** (Acute Pancreatitis). In chronic pancreatic insufficiency, these enzymes are often normal or even low due to the destruction of acinar tissue. They are not used to assess functional insufficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Most Sensitive Non-invasive Test:** Faecal Elastase-1 (more specific and easier than 72-hour fat collection). * **Gold Standard (Invasive):** Secretin-Cholecystokinin (CCK) stimulation test. * **Classic Triad of Chronic Pancreatitis:** Steatorrhea, Diabetes Mellitus, and Pancreatic Calcification. * **D-Xylose Test:** Used to differentiate mucosal malabsorption (e.g., Celiac disease) from pancreatic insufficiency (D-xylose absorption is normal in pancreatic disease).

Q: In which of the following conditions of malabsorption is an intestinal biopsy diagnostic?

Whipple's disease. In malabsorption syndromes, intestinal biopsy findings are categorized into three groups: **Diagnostic** (pathognomonic), **Suggestive** (but not specific), and **Non-diagnostic**. ### Why Whipple's Disease is the Correct Answer **Whipple’s disease** is one of the few conditions where an intestinal biopsy is considered **diagnostic** [1]. The characteristic histological finding is the presence of **PAS-positive macrophages** in the lamina propria containing Gram-positive bacilli (*Tropheryma whipplei*) [1]. These macrophages distort the villi, providing a definitive diagnosis that does not require further clinical correlation for confirmation. ### Explanation of Incorrect Options * **Celiac Disease:** While biopsy is essential, it is **suggestive** rather than pathognomonic. Findings like villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes (Marsh Criteria) can also be seen in tropical sprue or viral enteritis [2]. Diagnosis requires clinical and serological correlation (e.g., anti-tTG antibodies). * **Tropical Sprue:** Similar to Celiac disease, the biopsy shows non-specific subtotal villous atrophy. It is a diagnosis of exclusion based on travel history and response to antibiotics/folate. * **Lactose Intolerance:** This is a mucosal enzyme deficiency. The intestinal morphology (biopsy) appears **completely normal**. Diagnosis is typically made via a Hydrogen Breath Test or clinical challenge. ### High-Yield Clinical Pearls for NEET-PG * **Other conditions where biopsy is diagnostic:** Abetalipoproteinemia (clear vacuolated enterocytes), Agammaglobulinemia (absence of plasma cells), and Mycobacterium avium-intracellulare (acid-fast bacilli in macrophages). * **Whipple's Disease Triad:** Malabsorption, migratory polyarthritis, and lymphadenopathy [1]. * **Treatment of Whipple's:** Ceftriaxone (initial) followed by oral Trimethoprim-sulfamethoxazole (TMP-SMX) for 1 year.

Q: A 45-year-old male presents with a history of epigastric pain radiating to the back after a night of partying. Which of the following investigations is most appropriate for diagnosing the cause of his symptoms?

Serum lipase. The clinical presentation of epigastric pain radiating to the back, especially following alcohol consumption ("partying"), is a classic description of **Acute Pancreatitis** [1]. **1. Why Serum Lipase is the Correct Answer:** Serum lipase is the preferred biochemical marker for diagnosing acute pancreatitis. According to the Revised Atlanta Criteria, the diagnosis requires at least two of the following: (a) characteristic abdominal pain, (b) serum amylase or lipase levels >3 times the upper limit of normal, and (c) characteristic findings on imaging. Lipase is more **specific** than amylase and remains elevated for a longer duration (7–14 days), making it superior for diagnosis. **2. Why Other Options are Incorrect:** * **CPK-MB:** This is a marker for myocardial injury (Acute Coronary Syndrome). While an inferior wall MI can present with epigastric pain, it does not typically radiate to the back or follow alcohol binges. * **ALP (Alkaline Phosphatase):** This is a marker of cholestasis or bone turnover. While it may be elevated in gallstone pancreatitis, it is not diagnostic of pancreatitis itself. * **Gamma-GGT:** This is a sensitive marker for hepatobiliary disease and chronic alcohol consumption, but it lacks the specificity to diagnose acute pancreatic inflammation. **Clinical Pearls for NEET-PG:** * **Most Specific Marker:** Serum Lipase. * **Earliest Marker:** Serum Amylase (rises within 2–12 hours) but returns to normal faster (3–5 days). * **Most Common Cause:** Gallstones (overall), followed by Alcohol. * **Imaging of Choice:** Contrast-Enhanced CT (CECT) is the gold standard but is ideally performed after 48–72 hours to assess for necrosis [2]. * **Cullen’s Sign/Grey Turner’s Sign:** Indicators of hemorrhagic pancreatitis (periumbilical and flank ecchymosis, respectively).

Q: A middle-aged patient presents with dysphagia for liquids. A barium esophagogram is shown. What is the diagnosis?

Achalasia. ***Achalasia*** - Barium esophagogram shows the classic **"bird-beak" sign** with a dilated esophagus and smooth tapering at the gastroesophageal junction. - **Dysphagia for both liquids and solids** is characteristic, caused by failure of the **lower esophageal sphincter** to relax properly. *Diffuse esophageal spasm (DES)* - Barium study would show a **"corkscrew" pattern** with multiple simultaneous contractions, not the smooth tapering seen here. - Typically causes **chest pain** rather than progressive dysphagia, and liquids are usually tolerated better than solids. *Nutritional causes of esophageal dysfunction (NCE)* - Would not produce the characteristic **bird-beak appearance** on barium swallow studies. - Usually associated with **vitamin deficiencies** (B12, folate) and presents with more generalized symptoms rather than isolated dysphagia. *Esophageal cancer* - Barium study would show an **irregular filling defect** or **apple-core lesion** rather than smooth tapering. - Typically presents with **progressive dysphagia** starting with solids then progressing to liquids, opposite to the pattern in achalasia.

Q: In a 30-year-old man, which of the following is the most likely organism causing infection of the epididymis?

Chlamydia. The etiology of acute epididymitis is primarily determined by the **patient's age** and sexual history. This is a high-yield distinction for NEET-PG. ### **Explanation of the Correct Answer** In men **under the age of 35**, acute epididymitis is most commonly caused by sexually transmitted organisms. **Chlamydia trachomatis** is the most frequent pathogen [1], followed by *Neisseria gonorrhoeae* [1]. These infections typically result from retrograde spread of the organism from the urethra through the vas deferens. ### **Analysis of Incorrect Options** * **A. E. coli:** This is the most common cause of epididymitis in men **over 35 years** or in children. In these groups, the infection is usually associated with urinary tract infections (UTIs), bladder outlet obstruction (e.g., BPH), or recent urological instrumentation [2]. * **B. Gonococci:** While *Neisseria gonorrhoeae* is a common cause of sexually transmitted epididymitis in young men, it is statistically less frequent than *Chlamydia* [1]. * **D. Ureaplasma ureolyticum:** This is a recognized cause of non-gonococcal urethritis and can occasionally cause epididymitis, but it is far less common than Chlamydia [1]. ### **Clinical Pearls for NEET-PG** * **Age *Gonorrhea*). Treatment: Ceftriaxone (IM) + Doxycycline. * **Age > 35 years:** Think Coliforms (*E. coli*, *Pseudomonas*). Treatment: Fluoroquinolones (e.g., Levofloxacin).

Q: Hereditary pancreatitis is characterised by all except?

Autosomal recessive inheritance. **Explanation:** Hereditary Pancreatitis is a rare genetic condition characterized by recurrent episodes of acute pancreatitis starting in childhood, often progressing to chronic pancreatitis. **1. Why Option D is the Correct Answer (The Exception):** Hereditary pancreatitis is primarily an **Autosomal Dominant** condition, not recessive. The most common cause is a mutation in the **PRSS1 gene** (cationic trypsinogen gene) on chromosome 7. This mutation prevents the deactivation of trypsin within the pancreas, leading to premature enzyme activation and autodigestion. **2. Analysis of Other Options:** * **Option A (30% leads to Chronic Pancreatitis):** This is a recognized clinical progression. Recurrent inflammatory insults lead to permanent structural damage, calcification, and exocrine/endocrine insufficiency in a significant portion of patients. * **Option B (80% penetrance):** The PRSS1 mutation exhibits high but incomplete penetrance, typically cited around 80%. This means 80% of individuals carrying the gene will manifest clinical symptoms. * **Option C (High risk for Pancreatic cancer):** This is a critical clinical feature. Patients have a **50- to 70-fold increased risk** of developing pancreatic adenocarcinoma. The cumulative risk of cancer by age 70 is estimated to be nearly 40%. **Clinical Pearls for NEET-PG:** * **Gene Mutation:** PRSS1 (most common), SPINK1 (associated with tropical pancreatitis), and CFTR. * **Diagnosis:** Suspect in patients with two or more family members with pancreatitis across two generations. * **Management:** Primarily supportive; however, due to the extreme cancer risk, total pancreatectomy with auto-islet cell transplantation is sometimes considered. * **Screening:** Annual screening for pancreatic cancer (using EUS or MRI) is recommended starting at age 40.

Q: Which of the following is the established biological therapy for Crohn's disease?

Anti TNF-alpha antibody. **Explanation:** **1. Why Anti-TNF-alpha is Correct:** Tumor Necrosis Factor-alpha (TNF-α) is a key pro-inflammatory cytokine that plays a central role in the pathogenesis of Crohn’s disease by inducing intestinal inflammation and mucosal damage. Biological therapies targeting TNF-α (e.g., **Infliximab, Adalimumab, Certolizumab**) have revolutionized management. They work by neutralizing soluble and membrane-bound TNF-α, inducing apoptosis of inflammatory cells, and promoting mucosal healing. These are indicated for moderate-to-severe Crohn’s disease, especially in patients refractory to conventional steroids or thiopurines [1]. **2. Why the Other Options are Incorrect:** * **IL-1 Antagonist (Anakinra):** While IL-1 is involved in general inflammation, its antagonists have not shown clinical efficacy in Crohn’s disease and are primarily used in Rheumatoid Arthritis or Autoinflammatory syndromes. * **IL-6 Antagonist (Tocilizumab):** Although IL-6 levels are elevated in IBD, clinical trials have not established IL-6 inhibition as a standard therapy for Crohn’s; it is mainly used in Rheumatoid Arthritis and Giant Cell Arteritis. * **IL-8 Antagonist:** IL-8 is a potent neutrophil chemoattractant, but it is not a target for any currently approved biological therapy for IBD. **3. NEET-PG High-Yield Pearls:** * **First-line Biological:** Infliximab is often the first biological used, especially for **fistulizing Crohn’s disease**. * **Other Biological Targets:** Apart from Anti-TNF, other approved biologics include **Vedolizumab** (Anti-α4β7 integrin) and **Ustekinumab** (Anti-IL-12/23). * **Pre-treatment Screening:** Before starting Anti-TNF therapy, always screen for **Latent Tuberculosis (Chest X-ray, TST/IGRA)** and **Hepatitis B**, as these drugs can cause reactivation. * **Side Effects:** Increased risk of opportunistic infections and lymphoma (especially when combined with azathioprine).

Question 1

Which of the following is the most appropriate diagnostic test for pancreatic insufficiency?

Accepted Answer

Faecal fat estimation

Answer

Schilling test

Answer

Serum lipase

Answer

Serum amylase

Question 2

A 25-year-old male with no previous history of jaundice presents with yellowish discoloration of the sclera for 3 days, accompanied by fatigue and abdominal pain. He has been fasting for the past 3 days due to religious reasons. On examination, his abdomen was soft and tender with no evidence of hepatomegaly. Hepatic histology showed a moderate increase in the lipofuscin pigment. Which of the following would be expected in this patient?

Accepted Answer

Unconjugated hyperbilirubinemia

Answer

Conjugated hyperbilirubinemia

Answer

Grossly elevated AST/ALT

Answer

Normal bilirubin

Question 3

In which of the following conditions of malabsorption is an intestinal biopsy diagnostic?

Accepted Answer

Whipple's disease

Answer

Celiac disease

Answer

Tropical sprue

Answer

Lactose intolerance

Question 4

A 45-year-old male presents with a history of epigastric pain radiating to the back after a night of partying. Which of the following investigations is most appropriate for diagnosing the cause of his symptoms?

Accepted Answer

Serum lipase

Answer

CPK-MB

Answer

ALP

Answer

Gamma-GGT

Question 5

A middle-aged patient presents with dysphagia for liquids. A barium esophagogram is shown. What is the diagnosis?

Accepted Answer

Achalasia

Answer

Diffuse esophageal spasm (DES)

Answer

Nutritional causes of esophageal dysfunction (NCE)

Answer

Esophageal cancer

Question 6

Antiendomysial Antibody is typically seen in which of the following conditions?

Accepted Answer

Celiac Disease

Answer

Systemic Lupus Erythematosus (SLE)

Answer

Tropical sprue

Answer

Collagenous Colitis

Question 7

In a 30-year-old man, which of the following is the most likely organism causing infection of the epididymis?

Accepted Answer

Chlamydia

Answer

E. coli

Answer

Gonococci

Answer

Ureaplasma ureolyticum

Question 8

Hereditary pancreatitis is characterised by all except?

Accepted Answer

Autosomal recessive inheritance

Answer

30% leads to Chronic Pancreatitis

Answer

80% penetrance

Answer

High risk for Pancreatic cancer

Question 9

Transjugular intrahepatic portosystemic shunt (TIPS) is used in all except?

Accepted Answer

Hepatopulmonary syndrome

Answer

Refractory ascites

Answer

Budd-Chiari syndrome

Answer

Refractory hepatic hydrothorax

Question 10

Which of the following is the established biological therapy for Crohn's disease?

Accepted Answer

Anti TNF-alpha antibody

Answer

IL-1 antagonist

Answer

IL-6 antagonist

Answer

IL-8 antagonist

Gastroenterology — MCQs

Gastroenterology — MCQs

On this page

Practice by Chapter

Want unlimited practice?