Gastroenterology Practice Questions

Q: What condition is characterized by a "crumbled egg appearance" in the liver?

Hydatid liver disease. **Explanation:** **Hydatid Liver Disease (Correct Answer):** Hydatid disease is caused by the larval stage of the tapeworm *Echinococcus granulosus* [1]. The "crumbled egg appearance" (also known as the **Water Lily sign**) occurs when the endocyst (the inner germinal layer) ruptures and detaches from the pericyst, causing the membranes to float or collapse within the cyst fluid [1]. On imaging (USG or CT), these undulating, collapsed membranes resemble a crumbled eggshell or floating lilies. **Analysis of Incorrect Options:** * **Hepatic Adenoma:** Typically presents as a well-demarcated, hypervascular solid mass, often associated with oral contraceptive use. It does not show cystic membrane detachment. * **Chronic Amoebic Liver Abscess:** Classically described as having **"Anchovy sauce"** appearance (reddish-brown pus). On imaging, it appears as a poorly defined hypoechoic collection, not a structured cyst with membranes. * **Haemangioma:** The most common benign liver tumor. It shows a characteristic **"peripheral globular enhancement"** with centripetal fill-in on contrast CT, rather than a cystic appearance. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Agent:** *Echinococcus granulosus* (Definitive host: Dog; Intermediate host: Sheep; Accidental host: Human). * **Gharbi Classification:** Used for USG staging of Hydatid cysts. * **Other Signs:** **Snowstorm appearance** (hydatid sand) and **Cartwheel/Honeycomb appearance** (daughter cysts). * **Treatment:** PAIR (Puncture, Aspiration, Injection, Re-aspiration) is a minimally invasive option. Albendazole is the drug of choice. * **Complication:** Rupture can lead to life-threatening **Anaphylaxis**.

Q: Defective hepatic conjugation is seen in all of the following conditions except?

Novobiocin therapy. This question tests your knowledge of the mechanisms of unconjugated hyperbilirubinemia, specifically focusing on the enzyme **Uridine diphosphate-glucuronosyltransferase (UGT1A1)**. [1] ### **Explanation of the Correct Answer** **D. Novobiocin therapy:** While Novobiocin can cause unconjugated hyperbilirubinemia, it does so primarily by **inhibiting the hepatic uptake** of bilirubin, not by defecting the conjugation process itself. In NEET-PG, it is crucial to distinguish between defects in uptake (e.g., Rifampicin, Novobiocin) and defects in conjugation (e.g., Gilbert, Crigler-Najjar). [2] ### **Analysis of Incorrect Options** * **A. Neonatal jaundice:** This is a physiological state where conjugation is defective due to the **immaturity of the UGT1A1 enzyme** at birth, leading to transient unconjugated hyperbilirubinemia. [1] * **B. Gilbert syndrome:** This is a common hereditary condition characterized by **reduced activity (approx. 30%)** of UGT1A1, usually due to a promoter mutation (TATAA box). [1] * **C. Crigler-Najjar syndrome:** This involves a severe defect in conjugation. **Type I** has a total absence of UGT1A1 activity, while **Type II (Arias syndrome)** has a severe deficiency ( 20 mg/dL; risk of kernicterus; does **not** respond to Phenobarbital. [1] * **Crigler-Najjar Type II:** Serum bilirubin <20 mg/dL; **responds** to Phenobarbital (induces enzyme activity). [1] * **Drug-induced uptake inhibition:** Rifampicin and Novobiocin are classic examples. [2]

Q: A 40-year-old female presents with koilonychias, iron deficiency, and dysphagia. What is the most likely diagnosis?

Plummer-Vinson syndrome. ### Explanation The correct answer is **Plummer-Vinson syndrome (PVS)**, also known as Paterson-Brown-Kelly syndrome. **1. Why Plummer-Vinson Syndrome is Correct:** PVS is characterized by a classic clinical triad: **Iron deficiency anemia (IDA), dysphagia, and esophageal webs.** * **Koilonychia:** This "spoon-shaped" nail deformity is a specific physical sign of chronic, severe iron deficiency. * **Dysphagia:** In PVS, this is typically painless and progressive, caused by the formation of post-cricoid esophageal webs (thin mucosal folds). * **Demographics:** It most commonly affects middle-aged women, matching the patient profile in the question. **2. Why Other Options are Incorrect:** * **Achalasia Cardia:** While it presents with dysphagia, it is a motility disorder due to the failure of the Lower Esophageal Sphincter (LES) to relax. It is not associated with iron deficiency or koilonychia. * **Zollinger-Ellison Syndrome:** This is caused by a gastrin-secreting tumor (gastrinoma) leading to severe peptic ulcers and diarrhea. It does not typically cause esophageal webs or koilonychia. **3. NEET-PG High-Yield Pearls:** * **Pre-malignant Condition:** PVS is a significant risk factor for **Squamous Cell Carcinoma** of the esophagus and pharynx. * **Diagnosis:** The investigation of choice for visualizing the web is a **Barium Swallow** (lateral view), though endoscopy is also used. * **Treatment:** The primary treatment is **Iron supplementation**, which often resolves the dysphagia. Refractory cases may require endoscopic dilation. * **Associated signs:** Glossitis (smooth red tongue) and cheilosis are also frequently seen in these patients.

Q: Secretory diarrhea is found in which of the following conditions?

Shigella infection. **Explanation:** **Secretory diarrhea** occurs when there is an active secretion of electrolytes (primarily sodium and chloride) and water into the intestinal lumen, or an inhibition of their absorption. This process is independent of food intake and typically persists even during fasting. **Why Shigella is the correct answer:** *Shigella* species produce the **Shiga toxin** (and enterotoxins), which stimulates the mucosal cells to secrete fluids and electrolytes [2]. While *Shigella* is classically associated with inflammatory diarrhea (dysentery), its initial phase often presents as a profuse secretory diarrhea due to the action of enterotoxins on the small intestine before the organism invades the colonic mucosa [2]. **Analysis of Incorrect Options:** * **A. Thyrotoxicosis:** Causes diarrhea primarily through **hypermotility** (decreased transit time), which limits the time available for fluid absorption. * **C. Lactase deficiency:** Causes **osmotic diarrhea** [1]. Undigested lactose remains in the gut lumen, creating an osmotic gradient that pulls water into the intestine [1]. This diarrhea characteristically stops with fasting. * **D. Glucose intake:** In normal individuals, glucose aids sodium absorption via the SGLT-1 transporter. However, in cases of malabsorption, it acts as an **osmotic agent**, leading to osmotic diarrhea. **High-Yield Clinical Pearls for NEET-PG:** 1. **Stool Osmotic Gap:** In secretory diarrhea, the gap is **low ( 125 mOsm/kg)**. 2. **Classic Example:** The "gold standard" for secretory diarrhea is **Vibrio cholerae** (via cAMP activation). 3. **Hormonal Causes:** VIPoma (Verner-Morrison syndrome), Carcinoid syndrome, and Medullary Thyroid Carcinoma are important non-infectious causes of secretory diarrhea.

Q: Which of the following is NOT a feature of chronic liver disease?

Koilonychia. Chronic Liver Disease (CLD) is characterized by the progressive destruction of hepatic parenchyma, leading to fibrosis and cirrhosis [1]. **Why Koilonychia is the correct answer:** **Koilonychia** (spoon-shaped nails) is a classic sign of **Iron Deficiency Anemia**. While patients with CLD may develop anemia due to chronic blood loss (varices) or malnutrition [1], koilonychia is not a primary clinical feature or diagnostic sign of liver cirrhosis itself. In contrast, the characteristic nail finding in CLD is **Terry’s nails** (proximal 2/3rd white, distal 1/3rd red/pink) or clubbing [1]. **Analysis of incorrect options:** * **Hepatomegaly:** In the early stages of CLD (especially in alcoholic liver disease or NAFLD), the liver is often enlarged [1]. While the liver eventually shrinks and becomes nodular in advanced cirrhosis, hepatomegaly remains a recognized feature of the disease spectrum. * **Variceal Bleeding:** This is a direct consequence of **Portal Hypertension** [1]. Fibrosis increases intrahepatic resistance, diverting blood to portosystemic collaterals (esophageal/gastric varices), which are prone to rupture. * **Hepatic Encephalopathy:** This occurs due to the liver's inability to detoxify neurotoxic substances (like ammonia) and the shunting of blood around the liver, leading to altered mental status and asterixis [1]. **NEET-PG High-Yield Pearls:** * **Most common cause of CLD in India:** Post-hepatitic (Hepatitis B) followed by Alcohol. * **Stigmata of Hyperestrogenism in CLD:** Spider naevi (in the distribution of SVC), Palmar erythema, and Gynecomastia [1]. * **Cruveilhier-Baumgarten Murmur:** A venous hum heard over the epigastrium due to recanalization of the umbilical vein in portal hypertension. * **Child-Pugh Score parameters:** Bilirubin, Albumin, INR, Ascites, and Encephalopathy [1].

Q: Which of the following is a new drug available to treat multidrug-resistant tuberculosis?

Bedaquiline. Explanation: Bedaquiline (Option A) is the correct answer. It represents a breakthrough in the management of Multidrug-Resistant Tuberculosis (MDR-TB). It is a diarylquinoline that works by a unique mechanism: inhibiting the mycobacterial ATP synthase enzyme, thereby depleting the energy source of Mycobacterium tuberculosis. It was the first new class of TB drugs approved by the FDA in over 40 years and is a cornerstone of the WHO-recommended all-oral shorter regimens for MDR-TB. Analysis of Incorrect Options: * Rifampicin (Option B): This is a first-line antitubercular drug (Group 1). By definition, MDR-TB is characterized by resistance to at least Isoniazid and Rifampicin; therefore, it is not a "new" drug for treating MDR-TB, but rather the drug to which the bacteria are resistant [1]. * Linezolid (Option C): While Linezolid is used in the treatment of MDR-TB and XDR-TB (classified as a Group A drug by WHO), it is an oxazolidinone antibiotic originally developed for Gram-positive infections (like MRSA) [2]. It is not a "newly developed" drug specifically for TB in the same context as Bedaquiline. * Cefepime (Option D): This is a fourth-generation cephalosporin used for systemic bacterial infections (e.g., Pseudomonas). It has no clinical role in the treatment of tuberculosis. High-Yield Clinical Pearls for NEET-PG: * MDR-TB Definition: Resistance to at least Isoniazid (H) and Rifampicin (R). * Bedaquiline Side Effect: The most significant adverse effect is QT interval prolongation; baseline and follow-up ECGs are mandatory. * Pre-XDR TB: MDR-TB plus resistance to any fluoroquinolone. * XDR-TB: MDR-TB plus resistance to any fluoroquinolone AND at least one additional Group A drug (Bedaquiline or Linezolid). * Other New Drugs: Delamanid (inhibits mycolic acid synthesis) and Pretomanid are other recent additions to the MDR-TB armamentarium.

Q: Which of the following is an indicator of severe ulcerative colitis?

Blood in lumen on sigmoidoscopy. The assessment of severity in Ulcerative Colitis (UC) is crucial for determining management strategies (outpatient vs. inpatient). [1] The correct answer is **Blood in lumen on sigmoidoscopy**, which is a key endoscopic marker of severe mucosal inflammation. [1] ### Why Option A is Correct According to the **Truelove and Witts criteria** and the **Mayo Score** (standard tools for UC assessment), endoscopic findings are pivotal. The presence of spontaneous bleeding or "blood in the lumen" indicates deep ulcerations and significant mucosal friability. In the Mayo Endoscopic Subscore, a score of 3 (Severe) is defined by spontaneous bleeding, prominent ulceration, and loss of vascular pattern. ### Why Other Options are Incorrect * **B. Stool volume > 1 liter:** While stool frequency (>6 times/day) is a criterion for severity, absolute stool volume is more characteristic of secretory diarrheas (like VIPoma or Cholera) rather than the inflammatory exudative diarrhea of UC. * **C. Serum albumin < 40 g/L:** While hypoalbuminemia is a marker of severity, the threshold in the Truelove and Witts criteria is typically **<30 g/L** (or <75% of normal). 40 g/L is within the low-normal range and is not specific for severe UC. * **D. Abdominal discomfort:** This is a subjective, non-specific symptom found in mild, moderate, and severe cases, as well as in Irritable Bowel Syndrome (IBS). ### NEET-PG High-Yield Pearls * **Truelove and Witts Criteria for Severe UC:** 1. Stools ≥6/day with macroscopic blood. [1] 2. Fever (>37.8°C). 3. Tachycardia (>90 bpm). 4. Anemia (Hb 30 mm/hr. * **Toxic Megacolon:** A life-threatening complication of severe UC; diagnosed when the transverse colon diameter is **>6 cm** on X-ray. [1] * **Drug of Choice:** IV Corticosteroids (e.g., Hydrocortisone) are the first-line treatment for acute severe UC.

Q: Which of the following is false regarding involvement in Crohn's disease?

Rectum. In Crohn’s disease (CD), the **rectum is characteristically spared**, which is a key diagnostic feature distinguishing it from Ulcerative Colitis (UC) [1]. While UC always involves the rectum and spreads proximally, CD can affect any part of the gastrointestinal tract from the mouth to the anus in a non-contiguous ("skip lesions") fashion [1]. ### **Explanation of Options:** * **Option B (Rectum):** This is the correct answer because rectal involvement is rare in CD (seen in <20% of cases). The "rectal sparing" sign is a classic endoscopic finding used to differentiate CD from UC [1]. * **Option A (Anorectal area):** This is a common site for CD. Up to 30% of patients present with perianal complications such as fistulae, fissures, or perianal abscesses, even when the rectum itself is not inflamed [1]. * **Option C (Small intestine with right colon):** This is the most common presentation of CD (Ileocolic involvement), seen in approximately 40-50% of patients. The terminal ileum is the most frequently affected site [1]. * **Option D (Large intestine alone):** This occurs in about 20% of patients (Colonic Crohn’s). It can mimic UC but is distinguished by the presence of skip lesions and the absence of rectal involvement [1]. ### **High-Yield Clinical Pearls for NEET-PG:** * **Distribution:** CD is "transmural" (affects all layers) and "discontinuous" (skip lesions) [1]. * **Most Common Site:** Terminal ileum [1]. * **Microscopy:** Non-caseating granulomas (pathognomonic, but seen in only 50% of biopsies). * **Endoscopy:** "Cobblestone" appearance and "creeping fat" (mesenteric fat wrapping around the bowel). * **Serology:** ASCA (Anti-Saccharomyces cerevisiae antibodies) is positive in CD, whereas p-ANCA is associated with UC.

Question 1

What condition is characterized by a "crumbled egg appearance" in the liver?

Accepted Answer

Hydatid liver disease

Answer

Hepatic adenoma

Answer

Chronic amoebic liver abscess

Answer

Haemangioma

Question 2

Defective hepatic conjugation is seen in all of the following conditions except?

Accepted Answer

Novobiocin therapy

Answer

Neonatal jaundice

Answer

Gilbert syndrome

Answer

Crigler-Najjar syndrome

Question 3

What is the recommended treatment for latent tuberculosis infection in patients who are Tuberculin positive and HIV positive?

Accepted Answer

Isoniazid biweekly for 9 months

Answer

2(HRZ)3 + 4(HR)3

Answer

Rifampicin biweekly for 6 months

Answer

Pyrazinamide daily for 6 months

Question 4

A 40-year-old female presents with koilonychias, iron deficiency, and dysphagia. What is the most likely diagnosis?

Accepted Answer

Plummer-Vinson syndrome

Answer

Achalasia cardia

Answer

Zollinger-Ellison syndrome

Answer

None of the above

Question 5

Which is the most likely cause of protein-losing enteropathy?

Accepted Answer

Menetrier's disease

Answer

Monosaccharidase deficiency

Answer

Sarcoidosis

Answer

Celiac sprue

Question 6

Secretory diarrhea is found in which of the following conditions?

Accepted Answer

Shigella infection

Answer

Thyrotoxicosis

Answer

Lactase deficiency

Answer

Glucose intake

Question 7

Which of the following is NOT a feature of chronic liver disease?

Accepted Answer

Koilonychia

Answer

Hepatomegaly

Answer

Variceal bleeding

Answer

Hepatic encephalopathy

Question 8

Which of the following is a new drug available to treat multidrug-resistant tuberculosis?

Accepted Answer

Bedaquiline

Answer

Rifampicin

Answer

Linezolid

Answer

Cefepime

Question 9

Which of the following is an indicator of severe ulcerative colitis?

Accepted Answer

Blood in lumen on sigmoidoscopy

Answer

Stool volume > 1 liter

Answer

Serum albumin < 40 g/L

Answer

Abdominal discomfort

Question 10

Which of the following is false regarding involvement in Crohn's disease?

Accepted Answer

Rectum

Answer

Anorectal area

Answer

Small intestine with right colon

Answer

Large intestine alone without involvement of small intestine

Gastroenterology — MCQs

Gastroenterology — MCQs

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