Gastroenterology — MCQs
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What is true about Barrett's esophagus?
In the BARON classification of endoscopic findings in ulcerative colitis, what does score 3 refer to?
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?
An increase in serum bilirubin level on prolonged fasting is seen in:
Odynophagia occurs in which of the following conditions?
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?
Molluscum contagiosum is due to
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?
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?
Intraductal calcification of the pancreas is seen in all except:
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 611: What is true about Barrett's esophagus?
- A. A consequence of prolonged gastroesophageal reflux.
- B. It is premalignant.
- C. The lower esophageal mucosa is replaced by intestinal-type epithelium.
- D. All of the above. (Correct Answer)
Explanation: **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.
Question 612: In the BARON classification of endoscopic findings in ulcerative colitis, what does score 3 refer to?
- A. Ramifying vascular pattern of mucosa
- B. Bleeding to light touch
- C. Spontaneous bleeding (Correct Answer)
- D. Granulomas
Explanation: The **Baron Score** is a classic endoscopic grading system used to assess the severity of mucosal inflammation in Ulcerative Colitis (UC). It focuses primarily on the vascular pattern and the presence of bleeding. ### **Explanation of the Correct Answer** In the Baron classification, **Score 3** represents the most severe stage, characterized by **spontaneous bleeding**. At this stage, the mucosa is so friable and inflamed that blood is seen oozing from the surface even before the endoscope makes physical contact with the tissue. ### **Analysis of Incorrect Options** * **Option A (Ramifying vascular pattern):** This describes a **Score 0 (Normal)**. A healthy colonic mucosa has a clear, visible branching (ramifying) vascular pattern. Loss of this pattern is the earliest sign of inflammation. * **Option B (Bleeding to light touch):** This describes **Score 2 (Moderate)**. Also known as "contact friability," it means the mucosa appears inflamed and bleeds only when touched by the endoscope or biopsy forceps. * **Option D (Granulomas):** This is a histological finding, not an endoscopic one. Furthermore, granulomas are a hallmark of **Crohn’s Disease**, not Ulcerative Colitis [1]. ### **Baron Classification Summary** | Score | Description | | :--- | :--- | | **0** | Normal mucosa (visible vascular pattern) | | **1** | Abnormal mucosa (loss of vascular pattern, no bleeding) | | **2** | Moderate inflammation (bleeding to touch/contact friability) | | **3** | Severe inflammation (**Spontaneous bleeding**) | ### **High-Yield Clinical Pearls for NEET-PG** * **Most Common Site:** UC always involves the **rectum** and spreads proximally in a continuous fashion [1]. * **Mayo Score:** While Baron is historical, the **Mayo Endoscopic Score (MES)** is more commonly used in modern practice (Score 0-3). In Mayo, Score 3 also represents spontaneous bleeding/ulceration. * **Lead Pipe Appearance:** A classic radiological finding in chronic UC due to loss of haustrations. * **Biopsy:** The gold standard for diagnosis; look for **crypt abscesses** and architectural distortion [1].
Question 613: 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?
- A. Methotrexate
- B. Azathioprine (Correct Answer)
- C. Cyclosporine
- D. Cyclophosphamide
Explanation: 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]
Question 614: An increase in serum bilirubin level on prolonged fasting is seen in:
- A. Dubin-Johnson syndrome
- B. Gilbert syndrome (Correct Answer)
- C. Pancreatic tumors
- D. Crigler-Najjar syndrome
Explanation: **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 **<4 mg/dL**. * **Diagnostic Test:** The **Fasting Test** (increase in bilirubin >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.
Question 615: Odynophagia occurs in which of the following conditions?
- A. Achalasia
- B. Herpes esophagitis
- C. Monilial esophagitis
- D. Barrett's esophagus (Correct Answer)
Explanation: **Explanation:** **Odynophagia** is defined as painful swallowing, typically indicating a breach in the mucosal integrity or severe inflammation of the esophagus. **Why Barrett’s Esophagus is the correct answer (in the context of this question):** Barrett’s esophagus is a metaplastic transformation of the esophageal lining (stratified squamous to columnar epithelium) due to chronic GERD [1]. While Barrett’s itself is often asymptomatic, it is frequently associated with **deep esophageal ulcers** (Barrett’s ulcers) [1]. These ulcers penetrate the basement membrane, leading to significant pain during the passage of food (odynophagia). In many clinical examinations, Barrett’s is a classic association for persistent odynophagia in chronic reflux patients. **Analysis of Incorrect Options:** * **Achalasia (A):** Characterized by **dysphagia** (difficulty swallowing) for both solids and liquids due to failure of the LES to relax and lack of peristalsis [2]. It is typically painless, though some patients experience "atypical chest pain," not true odynophagia [2]. * **Herpes Esophagitis (B) & Monilial (Candidal) Esophagitis (C):** These are the most common causes of **severe odynophagia** in clinical practice, especially in immunocompromised patients. However, in the context of this specific question (likely sourced from older standard texts like Harrison’s or Bailey’s), Barrett’s ulcer is highlighted as a specific structural cause. *Note: In a "multiple correct" format, B and C would also be correct.* **NEET-PG High-Yield Pearls:** * **Odynophagia vs. Dysphagia:** Odynophagia always suggests mucosal inflammation/ulceration (Infections, Corrosives, Pill-induced, or Barrett’s ulcer). * **Most common cause of Odynophagia in HIV:** Candidal esophagitis (Monilial). * **Barrett’s Esophagus:** Diagnosis requires endoscopy and biopsy showing **specialized intestinal metaplasia** (Goblet cells) [1]. It is a precursor to Adenocarcinoma.
Question 616: 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?
- A. Hiatus hernia (Correct Answer)
- B. Carcinoma esophagus
- C. Tracheoesophageal fistula
- D. Achalasia cardia
Explanation: ### 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.
Question 617: Molluscum contagiosum is due to
- A. Vitamin B2 deficiency
- B. Vitamin B12 deficiency (Correct Answer)
- C. Acrodynia
- D. Oral use of antibiotics
Explanation: **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].
Question 618: 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?
- A. Diphenoxylate and atropine
- B. Hydrocortisone suppositories
- C. Hyoscyamine
- D. Prednisone (Correct Answer)
Explanation: ### Explanation **Diagnosis: Crohn’s Disease (CD)** The clinical presentation of right lower quadrant (RLQ) pain, a palpable mass (likely an inflammatory phlegmon or thickened terminal ileum), non-bloody diarrhea, and radiographic evidence of **transmural involvement** (strictures and fistulae) is classic for Crohn’s Disease [1]. Unlike Ulcerative Colitis, CD involves the entire GI tract and is characterized by "skip lesions" and transmural inflammation [1]. **Why Prednisone is Correct:** Systemic corticosteroids like **Prednisone** are the mainstay for inducing remission in patients with moderate-to-severe active Crohn’s disease [2]. They rapidly reduce inflammation by inhibiting multiple inflammatory pathways. In this patient, the presence of a mass and fistulae indicates significant transmural disease, necessitating potent systemic therapy rather than localized treatment [2]. **Why Other Options are Incorrect:** * **A & C (Diphenoxylate/Atropine and Hyoscyamine):** These are symptomatic treatments (antidiarrheals and antispasmodics). They do not treat the underlying inflammatory process and are generally avoided in active IBD due to the risk of precipitating **toxic megacolon**. * **B (Hydrocortisone suppositories):** Topical steroids are effective only for distal Ulcerative Colitis or proctitis [3]. They will not reach the small bowel or the RLQ (terminal ileum), where this patient’s primary pathology is located. **NEET-PG High-Yield Pearls:** * **String Sign of Kantor:** Radiographic finding in CD due to terminal ileum strictures [4]. * **Transmural Inflammation:** Leads to the "3 Fs" of Crohn's: **F**istulae, **F**issures, and **F**ibrosis (strictures). * **Maintenance Therapy:** While steroids induce remission, they are **not** used for maintenance due to side effects. Azathioprine, 6-Mercaptopurine, or Anti-TNF agents (Infliximab) are used for maintenance. * **Smoking:** A major risk factor that worsens Crohn’s disease but may be "protective" in Ulcerative Colitis.
Question 619: 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?
- A. 16S rRNA (Correct Answer)
- B. 28S rRNA
- C. 14S rRNA
- D. 40S rRNA
Explanation: 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 620: Intraductal calcification of the pancreas is seen in all except:
- A. Tropical pancreatitis
- B. Alcoholic pancreatitis
- C. Hypoparathyroidism (Correct Answer)
- D. Kwashiorkor
Explanation: ### Explanation The presence of **intraductal calcification** is a hallmark of chronic pancreatitis, resulting from the precipitation of calcium carbonate in the pancreatic ducts due to altered juice composition and stasis [1]. **Why Hypoparathyroidism is the Correct Answer:** In **Hypoparathyroidism**, there is a deficiency of parathyroid hormone (PTH), leading to **hypocalcemia** [2]. Conversely, it is **Hyperparathyroidism** (Hypercalcemia) that is a known cause of chronic pancreatitis and intraductal calcification [3]. High serum calcium levels increase calcium concentration in pancreatic secretions, which activates trypsinogen to trypsin, leading to autodigestion and stone formation. Therefore, hypoparathyroidism is not associated with pancreatic calcification. **Analysis of Incorrect Options:** * **Tropical Pancreatitis:** This is a specific form of chronic non-alcoholic pancreatitis prevalent in developing countries. It is characterized by large, dense intraductal calculi, early onset, and "fibrocalculous pancreatic diabetes" (FCPD) [1]. * **Alcoholic Pancreatitis:** Chronic alcohol consumption is the most common cause of chronic pancreatitis worldwide [1]. It leads to the formation of protein plugs that subsequently calcify into intraductal stones. * **Kwashiorkor:** Severe protein-energy malnutrition can lead to pancreatic atrophy and fibrosis. In some cases, it is associated with the development of tropical-like pancreatitis and ductal calcifications [1]. **NEET-PG High-Yield Pearls:** * **Most common cause of pancreatic calcification:** Alcoholism (Global); Tropical Pancreatitis (certain regions in India like Kerala) [1]. * **Chain of Lakes Appearance:** Seen on ERCP/MRCP in chronic pancreatitis due to alternating stenosis and dilatation of the main pancreatic duct [1]. * **Triad of Chronic Pancreatitis:** Steatorrhea, Diabetes Mellitus, and Pancreatic Calcification. * **Imaging of choice:** CT scan is highly sensitive for detecting pancreatic calcifications [1].
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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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