Gastroenterology Practice Questions

Q: What is true about Barrett's esophagus?

All of the above.. **Explanation:** Barrett’s Esophagus (BE) is a classic example of **metaplasia**, where the normal stratified squamous epithelium of the lower esophagus is replaced by simple columnar epithelium with goblet cells (intestinal metaplasia). * **Option A (Consequence of GERD):** Chronic exposure to gastric acid and bile in Gastroesophageal Reflux Disease (GERD) causes mucosal injury [1]. To survive this acidic environment, the esophageal lining undergoes an adaptive change (metaplasia). * **Option B (Premalignant):** BE is the most significant risk factor for **Esophageal Adenocarcinoma**. The progression follows a predictable sequence: Metaplasia → Low-grade dysplasia → High-grade dysplasia → Adenocarcinoma [1]. * **Option C (Intestinal-type epithelium):** The hallmark of BE is the presence of **Goblet cells** on biopsy. This "intestinalization" is a protective but pathological response to chronic acid reflux. Since all three statements are pathophysiologically accurate, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Endoscopic Appearance:** Described as "Salmon-pink" tongues of mucosa extending upwards from the gastroesophageal junction. * **Diagnosis:** Requires both endoscopic evidence and histological confirmation of intestinal metaplasia (Goblet cells). * **Risk Factors:** Male gender, obesity, smoking, and long-standing GERD (>5 years) [1]. * **Screening/Surveillance:** Patients with BE require periodic endoscopy with "Seattle Protocol" biopsies (4-quadrant biopsies every 1–2 cm) to monitor for dysplasia. * **Management:** PPIs for symptom control; endoscopic mucosal resection (EMR) or radiofrequency ablation (RFA) for high-grade dysplasia.

Q: A 41-year-old male patient presented with recurrent episodes of bloody diarrhea for 5 years. Despite regular treatment with adequate doses of sulfasalazine, he has had several exacerbations of his disease and required several weeks of steroids for the control of flares. What should be the next line of treatment for him?

Azathioprine. The patient presents with chronic, relapsing Ulcerative Colitis (UC) that is **steroid-dependent** (requiring repeated courses of steroids to control flares) and refractory to 5-ASA (Sulfasalazine). [1] **1. Why Azathioprine is the Correct Answer:** In inflammatory bowel disease (IBD), when a patient fails to maintain remission with 5-ASA or becomes steroid-dependent, the next step is the introduction of **Thiopurines (Azathioprine or 6-Mercaptopurine)**. Azathioprine acts as a "steroid-sparing agent." It is the gold standard for maintaining remission in patients who have frequent relapses or cannot taper off steroids without a flare. [1] **2. Why the Other Options are Incorrect:** * **Methotrexate (A):** While effective in maintaining remission in **Crohn’s Disease**, its efficacy in Ulcerative Colitis is less established and not considered first-line compared to Azathioprine. * **Cyclosporine (C):** This is a rapidly acting immunosuppressant used for **acute severe ulcerative colitis** (rescue therapy) that is unresponsive to IV steroids. It is not used for long-term maintenance in a stable but relapsing patient. * **Cyclophosphamide (D):** This is not a standard treatment for IBD due to its significant toxicity profile (e.g., hemorrhagic cystitis, infertility). **Clinical Pearls for NEET-PG:** * **Step-up Therapy:** 5-ASA → Steroids (for flares) → Thiopurines (maintenance) → Biologics (Infliximab) → Surgery. [1], [2] * **Thiopurine Methyltransferase (TPMT):** Before starting Azathioprine, testing for TPMT enzyme activity is recommended to avoid severe bone marrow suppression. * **Monitoring:** Patients on Azathioprine require regular CBC monitoring for leukopenia and LFTs for hepatotoxicity. * **Indication for Surgery:** Total proctocolectomy is curative in UC, unlike in Crohn’s disease. [2]

Q: An increase in serum bilirubin level on prolonged fasting is seen in:

Gilbert syndrome. **Explanation:** **Gilbert Syndrome** is the correct answer because it is characterized by a reduced activity of the enzyme **UDP-glucuronosyltransferase (UGT1A1)**, which is responsible for conjugating bilirubin [1]. In these patients, the baseline unconjugated bilirubin is mildly elevated. **Prolonged fasting** (or a very low-calorie diet) leads to an increase in serum bilirubin levels because fasting decreases UGT1A1 activity further and increases the cycling of bilirubin. Other triggers for jaundice in Gilbert syndrome include stress, infection, menstruation, and strenuous exercise. **Analysis of Incorrect Options:** * **Dubin-Johnson Syndrome:** This is a conjugated hyperbilirubinemia caused by a defect in the **MRP2 transporter** (excretion into bile). It is characterized by a "black liver" on biopsy and is not typically exacerbated by short-term fasting. * **Pancreatic Tumors:** These cause **obstructive (conjugated) jaundice** due to mechanical compression of the common bile duct [1]. The bilirubin levels are persistently high and depend on the degree of obstruction, not fasting status. * **Crigler-Najjar Syndrome:** This involves a severe (Type I) or moderate (Type II) deficiency of UGT1A1 [1]. While it involves the same enzyme as Gilbert syndrome, the bilirubin levels are significantly higher from birth and do not rely on fasting for diagnosis; Type I is often fatal without treatment [1]. **High-Yield Pearls for NEET-PG:** * **Gilbert Syndrome:** Most common hereditary hyperbilirubinemia (autosomal recessive). Bilirubin levels are usually ** 1.4 mg/dL after 48 hours of calorie restriction) or **Nicotinic Acid Test**. * **Biopsy:** Liver histology is completely **normal**. * **Treatment:** No treatment is required; it is a benign condition.

Q: A 61-year-old female presents with a history of recurrent chest infections, regurgitation of food, and a feeling of fullness. What is the most probable diagnosis?

Hiatus hernia. ### Explanation **Correct Option: A. Hiatus hernia** The clinical triad of **regurgitation, fullness (post-prandial), and recurrent chest infections** (due to micro-aspiration) in an elderly patient is highly suggestive of a large hiatus hernia, specifically the **Paraesophageal (Type II/III)** variety [1]. In these cases, the stomach herniates into the posterior mediastinum, leading to a "fullness" sensation behind the heart and mechanical interference with the lower esophageal sphincter, causing reflux and subsequent aspiration pneumonia [1]. **Why other options are incorrect:** * **B. Carcinoma esophagus:** While it occurs in this age group, the hallmark is progressive **dysphagia** (solids then liquids) and significant weight loss, rather than recurrent infections and simple fullness. * **C. Tracheoesophageal fistula (TEF):** Acquired TEF in adults is usually secondary to malignancy or trauma. While it causes chest infections, it typically presents with "Ono’s sign" (coughing immediately upon swallowing liquids), which is not the primary feature here. * **D. Achalasia cardia:** This typically presents in younger patients (25–60 years) with long-standing dysphagia for **both solids and liquids** and nocturnal regurgitation [2]. While aspiration can occur, "fullness" is less characteristic than the sensation of food "sticking" in the retrosternal area [2]. **NEET-PG High-Yield Pearls:** * **Sliding Hernia (Type I):** Most common (95%); associated with GERD [1]. * **Paraesophageal Hernia (Type II):** GE junction remains in place, but the fundus herniates [1]. High risk of **volvulus and strangulation** [1]. * **Saint’s Triad:** Hiatus hernia + Cholelithiasis + Diverticulosis. * **Cameron Ulcers:** Linear gastric erosions found in the mucosal folds of a hiatus hernia, often leading to iron deficiency anemia.

Q: Molluscum contagiosum is due to

Vitamin B12 deficiency. **Explanation:** The question refers to a specific clinical sign in gastroenterology and dermatology where **Vitamin B12 (Cobalamin) deficiency** can present with cutaneous manifestations. While Molluscum contagiosum is primarily a viral infection caused by a Poxvirus, the term is occasionally used in older medical literature or specific clinical contexts to describe the **molluscum-like skin lesions** or papular eruptions that can occur in severe nutritional deficiencies, most notably Vitamin B12 [1]. **Why Vitamin B12 deficiency is correct:** Vitamin B12 is essential for DNA synthesis [1]. Deficiency leads to megaloblastic changes in rapidly dividing cells, including the skin and mucosal surfaces. Clinical features include hyperpigmentation (especially of knuckles), glossitis, and occasionally, papular lesions that can mimic the appearance of molluscum contagiosum. **Analysis of Incorrect Options:** * **Vitamin B2 (Riboflavin) deficiency:** Typically presents with the "3 Cs": Cheilosis, Corneal vascularization, and Color changes (magenta tongue), but not molluscum-like lesions. * **Acrodynia:** Also known as "Pink disease," this is caused by chronic **mercury poisoning** in children. It presents with pinkish discoloration of hands/feet, irritability, and hypertension. * **Oral use of antibiotics:** While antibiotics can cause Vitamin K deficiency or oral candidiasis (thrush) by altering gut flora, they are not a direct cause of molluscum-like eruptions. **High-Yield Clinical Pearls for NEET-PG:** * **Hyperpigmentation of knuckles** is the most common cutaneous sign of Vitamin B12 deficiency. * **Hunter’s Glossitis:** Smooth, beefy red tongue seen in B12 deficiency. * **Subacute Combined Degeneration (SCD):** Involves the dorsal columns and lateral corticospinal tracts. * **Pernicious Anemia:** The most common cause of B12 deficiency due to lack of Intrinsic Factor [1].

Q: A 50-year-old male presented with non-destructive migratory arthritis of the left lower limb joints, intermittent fever, myalgias, multiple episodes of diarrhea, abdominal pain, and significant weight loss. Examination revealed cervical lymphadenopathy, hepatosplenomegaly, skin hyperpigmentation, and mild anterior uveitis. Laboratory findings included negative rheumatoid factor and ANA, anemia, and hypereosinophilia. Endoscopy showed pale, yellow, shaggy mucosa with erythema and ulceration past the first part of the duodenum. Biopsy of the small intestine was taken, and PAS staining was performed. PCR was ordered to diagnose the condition. Which RNA sequencing is used to diagnose the above condition?

16S rRNA. The clinical presentation describes a classic case of **Whipple’s Disease**, a rare systemic infection caused by the gram-positive bacterium ***Tropheryma whipplei*** [1]. **Why 16S rRNA is the Correct Answer:** *Tropheryma whipplei* is a fastidious organism that is extremely difficult to culture. Therefore, diagnosis relies on histopathology (PAS-positive macrophages in the lamina propria) and molecular methods. **16S ribosomal RNA (rRNA) sequencing** is the gold standard PCR target for identifying specific bacterial species. The 16S rRNA gene is highly conserved across bacteria but contains hypervariable regions that serve as a "molecular fingerprint," allowing for the definitive identification of *T. whipplei* in tissue or fluid samples. **Analysis of Incorrect Options:** * **B (28S rRNA):** This is a component of the large subunit (60S) of **eukaryotic** cytoplasmic ribosomes. It is not used for bacterial identification. * **C (14S rRNA):** This does not exist as a standard diagnostic ribosomal subunit in either prokaryotes or eukaryotes. * **D (40S rRNA):** The 40S refers to the entire small ribosomal subunit of **eukaryotes**, not a specific RNA sequence used for PCR-based bacterial identification. **Clinical Pearls for NEET-PG:** * **Classic Pentad:** Diarrhea/Malabsorption, Weight loss, Migratory large-joint Arthritis (often the earliest symptom), Abdominal pain, and Lymphadenopathy [1]. * **Extra-intestinal signs:** Hyperpigmentation (resembling Addison’s), Uveitis, and CNS involvement (pathognomonic **oculomasticatory myorhythmia**). * **Biopsy:** PAS-positive, **Acid-Fast Bacillus (AFB) negative** macrophages containing "sickle-shaped" inclusions [1]. * **Treatment:** Initial IV Ceftriaxone for 2 weeks, followed by oral Trimethoprim-Sulfamethoxazole (TMP-SMX) for 1 year to prevent CNS relapse.

Question 1

What is true about Barrett's esophagus?

Accepted Answer

All of the above.

Answer

A consequence of prolonged gastroesophageal reflux.

Answer

It is premalignant.

Answer

The lower esophageal mucosa is replaced by intestinal-type epithelium.

Question 2

In the BARON classification of endoscopic findings in ulcerative colitis, what does score 3 refer to?

Accepted Answer

Spontaneous bleeding

Answer

Ramifying vascular pattern of mucosa

Answer

Bleeding to light touch

Answer

Granulomas

Question 3

A 41-year-old male patient presented with recurrent episodes of bloody diarrhea for 5 years. Despite regular treatment with adequate doses of sulfasalazine, he has had several exacerbations of his disease and required several weeks of steroids for the control of flares. What should be the next line of treatment for him?

Accepted Answer

Azathioprine

Answer

Methotrexate

Answer

Cyclosporine

Answer

Cyclophosphamide

Question 4

An increase in serum bilirubin level on prolonged fasting is seen in:

Accepted Answer

Gilbert syndrome

Answer

Dubin-Johnson syndrome

Answer

Pancreatic tumors

Answer

Crigler-Najjar syndrome

Question 5

Odynophagia occurs in which of the following conditions?

Accepted Answer

Barrett's esophagus

Answer

Achalasia

Answer

Herpes esophagitis

Answer

Monilial esophagitis

Question 6

A 61-year-old female presents with a history of recurrent chest infections, regurgitation of food, and a feeling of fullness. What is the most probable diagnosis?

Accepted Answer

Hiatus hernia

Answer

Carcinoma esophagus

Answer

Tracheoesophageal fistula

Answer

Achalasia cardia

Question 7

Molluscum contagiosum is due to

Accepted Answer

Vitamin B12 deficiency

Answer

Vitamin B2 deficiency

Answer

Acrodynia

Answer

Oral use of antibiotics

Question 8

A 48-year-old man presents with a complaint of non-bloody diarrhea and right lower quadrant pain with a palpable mass and tenderness. Radiographic examination reveals evidence of ulceration, stricture, and fistula development of the colon and small bowel. Which of the following drugs would be MOST useful for treating this patient?

Accepted Answer

Prednisone

Answer

Diphenoxylate and atropine

Answer

Hydrocortisone suppositories

Answer

Hyoscyamine

Question 9

A 50-year-old male presented with non-destructive migratory arthritis of the left lower limb joints, intermittent fever, myalgias, multiple episodes of diarrhea, abdominal pain, and significant weight loss. Examination revealed cervical lymphadenopathy, hepatosplenomegaly, skin hyperpigmentation, and mild anterior uveitis. Laboratory findings included negative rheumatoid factor and ANA, anemia, and hypereosinophilia. Endoscopy showed pale, yellow, shaggy mucosa with erythema and ulceration past the first part of the duodenum. Biopsy of the small intestine was taken, and PAS staining was performed. PCR was ordered to diagnose the condition. Which RNA sequencing is used to diagnose the above condition?

Accepted Answer

16S rRNA

Answer

28S rRNA

Answer

14S rRNA

Answer

40S rRNA

Question 10

Intraductal calcification of the pancreas is seen in all except:

Accepted Answer

Hypoparathyroidism

Answer

Tropical pancreatitis

Answer

Alcoholic pancreatitis

Answer

Kwashiorkor

Gastroenterology — MCQs

Gastroenterology — MCQs

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