Gastroenterology Practice Questions

Q: Kayser Fleischer ring is seen in which condition?

Wilson's disease. **Explanation:** **Wilson’s Disease (Hepatolenticular Degeneration)** is an autosomal recessive disorder caused by a mutation in the **ATP7B gene** on chromosome 13. This defect leads to impaired biliary copper excretion and failure to incorporate copper into ceruloplasmin [1]. Consequently, free copper deposits in various tissues, leading to liver disease, neurological symptoms such as tremor and choreoathetosis, and renal tubulopathy [1]. The **Kayser-Fleischer (KF) ring** is a pathognomonic sign representing copper deposition in the **Descemet’s membrane** of the cornea. It appears as a golden-brown or greenish ring at the limbus and is best visualized via a **slit-lamp examination**. **Analysis of Incorrect Options:** * **Alpha 1-antitrypsin deficiency:** Characterized by the accumulation of misfolded AAT proteins in the liver (PAS-positive globules), leading to cirrhosis and emphysema, but no ocular copper deposition. * **Hemochromatosis:** A disorder of iron overload [2]. While it causes "bronze diabetes" (skin hyperpigmentation), iron deposits do not form KF rings; diagnosis often involves the Hepatic Iron Index (HII) [2]. * **Primary Biliary Cirrhosis (PBC):** While chronic cholestasis in PBC can occasionally lead to secondary copper retention and rare KF-like rings, the classic association for exams remains Wilson’s disease. **NEET-PG High-Yield Pearls:** * **KF Rings:** Present in >95% of patients with neurological Wilson’s but only ~50-60% of those with isolated hepatic presentation. * **Sunflower Cataract:** Another ocular finding in Wilson’s (copper deposition in the lens). * **Diagnosis:** Low serum ceruloplasmin (<20 mg/dL), increased 24-hour urinary copper excretion, and increased hepatic copper content on biopsy [3]. * **Treatment:** Chelating agents like **D-Penicillamine** or Trientine; Zinc is used for maintenance [1].

Q: A 30-year-old man presents with a 3-week history of fatigue, occasional fever, yellow skin and sclerae, tenderness below the right costal margin, and dark urine. Physical examination reveals jaundice and mild hepatomegaly. Laboratory studies show elevated serum levels of bilirubin, decreased albumin, and prolonged prothrombin time. Serologic tests disclose antibodies to hepatitis C virus. Which of the following tests is the most accurate method for assessing the extent of liver disease in this patient?

Liver biopsy. The patient presents with clinical and biochemical evidence of chronic liver disease (jaundice, hepatomegaly, hypoalbuminemia, and coagulopathy) secondary to **Hepatitis C Virus (HCV)** infection [4]. **Why Liver Biopsy is the Correct Answer:** While serology and PCR confirm the diagnosis of HCV, a **liver biopsy** remains the "gold standard" for assessing the **extent** of liver disease [1]. It provides two critical pieces of information: 1. **Grade:** Reflects the degree of active inflammation and hepatocellular necrosis. 2. **Stage:** Reflects the degree of fibrosis and the presence of cirrhosis (using systems like METAVIR or Ishak). Staging is crucial for determining prognosis and the urgency of treatment, as it identifies patients at high risk for hepatocellular carcinoma (HCC) and portal hypertension. **Why Other Options are Incorrect:** * **B. Serum Alkaline Phosphatase:** This is a marker of cholestasis or biliary obstruction. While it may be elevated in liver disease, it does not correlate with the degree of fibrosis or inflammation. * **C. Serum Ammonia:** This is used to evaluate hepatic encephalopathy but does not reflect the structural extent or stage of chronic liver disease. * **D. Serum Immunoglobulins:** Polyclonal gammopathy (elevated IgG) is common in chronic liver disease and autoimmune hepatitis, but it is non-specific and cannot stage the disease [2]. **NEET-PG High-Yield Pearls:** * **METAVIR Score for HCV:** F0 (no fibrosis) to F4 (cirrhosis). * **Non-invasive alternatives:** In modern practice, **Transient Elastography (FibroScan)** is increasingly used to assess fibrosis, but biopsy remains the most accurate reference standard. * **Prothrombin Time (PT):** This is the best prognostic marker among liver function tests because it reflects the liver's synthetic function and has a short half-life (Factor VII) [3].

Q: What is the best test for intestinal malabsorption?

D-xylose test. **Explanation:** The **D-xylose test** is considered the best initial screening test to differentiate between malabsorption caused by mucosal disease (e.g., Celiac disease, Tropical sprue) and malabsorption due to pancreatic insufficiency. D-xylose is a monosaccharide that is absorbed passively in the proximal small intestine without requiring pancreatic enzymes. Therefore, low urinary or blood levels of D-xylose indicate **intestinal mucosal damage**, whereas normal levels in a patient with malabsorption suggest pancreatic etiology. **Analysis of Incorrect Options:** * **B. NBT-PABA test:** This is a test for **pancreatic exocrine function**. It measures the ability of pancreatic chymotrypsin to cleave PABA from a synthetic peptide; it does not assess intestinal mucosal absorption. * **C. Fecal fat estimation (72-hour):** While this is the **gold standard for diagnosing steatorrhea** (confirming that malabsorption is present), it cannot differentiate the *cause* (mucosal vs. pancreatic) [2]. The question asks for the best test to evaluate the "intestinal" component specifically. * **D. Schilling test:** This was historically used to determine the cause of **Vitamin B12 malabsorption** (e.g., Pernicious anemia vs. bacterial overgrowth), but it does not assess general intestinal carbohydrate or protein absorption. **NEET-PG High-Yield Pearls:** * **Gold Standard for Steatorrhea:** 72-hour fecal fat estimation (>7g/day is abnormal). * **D-xylose False Positives:** Low levels can occur in SIBO (bacteria metabolize the sugar), renal failure (delayed excretion), and delayed gastric emptying. * **Most Sensitive Screening Test for Celiac:** Anti-tissue Transglutaminase (tTG) IgA [1]. * **Best Initial Test for Chronic Pancreatitis:** Fecal Elastase (highly specific).

Q: Which is the test of choice for assessment of mucosal function of the GIT?

D-xylose test. **Explanation:** The **D-xylose test** is the gold standard for assessing the **functional integrity of the proximal small intestinal mucosa**. D-xylose is a pentose sugar that is absorbed via passive diffusion in the proximal small bowel without requiring pancreatic enzymes. If the intestinal mucosa is damaged (e.g., in Celiac disease or Tropical sprue), absorption decreases, leading to low levels in the blood and urine. It is primarily used to differentiate **malabsorption** (mucosal disease) from **maldigestion** (pancreatic insufficiency). **Analysis of Incorrect Options:** * **A. Biopsy:** While a biopsy is the "gold standard" for providing a **histological diagnosis** (e.g., identifying villous atrophy), it assesses structure rather than overall mucosal function [1]. * **B. Schilling test:** This test specifically assesses **Vitamin B12 absorption**. It helps localize the cause of B12 deficiency (e.g., Pernicious anemia, ileal disease, or bacterial overgrowth) rather than general mucosal function. * **C. Small bowel study:** Imaging (like Barium follow-through) evaluates the **anatomy and transit time** of the GIT but cannot quantify the absorptive capacity of the mucosa. **NEET-PG High-Yield Pearls:** * **Normal Values:** After a 25g oral dose, a 5-hour urinary excretion of **>4.5g** is considered normal. * **False Positives:** Low urinary D-xylose can occur in **renal failure**, ascites, or **Small Intestinal Bacterial Overgrowth (SIBO)** (bacteria metabolize the sugar before absorption). * **Clinical Use:** It is the best initial test to distinguish between chronic pancreatitis (normal D-xylose) and Celiac disease (abnormal D-xylose).

Q: Which of the following is a precancerous condition of the stomach?

Atrophic gastritis. **Explanation:** The development of gastric adenocarcinoma (intestinal type) follows a well-defined multi-step progression known as **Correa’s Cascade**. This sequence begins with chronic inflammation, leading to **Atrophic Gastritis**, followed by intestinal metaplasia, dysplasia, and finally, carcinoma. **1. Why Atrophic Gastritis is correct:** Atrophic gastritis involves the chronic inflammation and subsequent loss of gastric glandular cells, often replaced by intestinal-type epithelium (metaplasia) [1]. This environment, frequently caused by chronic *H. pylori* infection or autoimmune processes, promotes DNA damage and cellular transformation, making it a definitive precancerous condition [1], [2]. **2. Why the other options are incorrect:** * **Lipoma:** This is a benign mesenchymal tumor composed of mature adipose tissue. It has no malignant potential and is usually an incidental finding. * **Linitis Plastica:** This is not a precancerous condition; rather, it is a **manifestation of advanced gastric cancer** (diffuse type). It is characterized by a "leather bottle" appearance of the stomach due to extensive submucosal infiltration by signet ring cells. * **Hyperacidity:** While associated with peptic ulcer disease (specifically duodenal ulcers), hyperacidity is not a precursor to malignancy [3]. In fact, gastric cancer is more commonly associated with *hypochlorhydria* (low acid) resulting from mucosal atrophy [1]. **NEET-PG High-Yield Pearls:** * **Correa’s Cascade:** Normal Mucosa → Chronic Gastritis → Atrophic Gastritis → Intestinal Metaplasia → Dysplasia → Adenocarcinoma. * **Most common site** for atrophic gastritis: Antrum (H. pylori); Body/Fundus (Autoimmune) [2]. * **Other Precancerous Conditions:** Adenomatous gastric polyps (not hyperplastic), Gastric ulcers (rarely), and Menetrier’s disease. * **H. pylori** is classified as a Class 1 Carcinogen by the WHO [1].

Q: The Rockall scoring system is used for the assessment of which condition?

Non-variceal upper gastrointestinal bleeding. The **Rockall Scoring System** is a clinical tool used to predict the risk of re-bleeding and mortality in patients presenting with **Non-Variceal Upper Gastrointestinal Bleeding (NVUGIB)**, such as peptic ulcer disease or Mallory-Weiss tears [1]. #### 1. Why the Correct Answer is Right The Rockall score is unique because it combines **clinical parameters** (age, shock status, comorbidities) with **endoscopic findings** (diagnosis and stigmata of recent hemorrhage, like an adherent clot or visible vessel) [1]. * **Pre-endoscopy score:** Based only on clinical data (max score 7). * **Full Rockall score:** Calculated after endoscopy (max score 11). A score of $\leq 2$ indicates a low risk of re-bleeding and mortality, often allowing for early discharge. #### 2. Why the Incorrect Options are Wrong * **Variceal Bleeding (Options B & C):** While Rockall can be applied to any UGIB, it is specifically validated and primarily used for non-variceal causes [1]. For variceal bleeding (secondary to portal hypertension), the **Child-Pugh Score** or **MELD Score** are more appropriate for prognosis, as they assess underlying liver function. #### 3. Clinical Pearls for NEET-PG * **Glasgow-Blatchford Score (GBS):** Unlike Rockall, GBS is used **strictly pre-endoscopy** to identify "low-risk" patients who do not require hospital admission [1]. It relies on urea, hemoglobin, systolic BP, and clinical markers (syncope/melena). * **Forrest Classification:** Used during endoscopy to grade the risk of re-bleeding in peptic ulcers (e.g., Ia is spurting hemorrhage). * **High-Yield Fact:** If a question asks for the score that predicts the need for **intervention** (transfusion/surgery), the answer is usually **Glasgow-Blatchford**. If it asks for **mortality risk** post-endoscopy, it is **Rockall**.

Question 1

Kayser Fleischer ring is seen in which condition?

Accepted Answer

Wilson's disease

Answer

Alpha 1-antitrypsin deficiency

Answer

Hemochromatosis

Answer

Primary biliary cirrhosis

Question 2

Which of the following conditions does NOT cause protein-losing enteropathy?

Accepted Answer

Irritable bowel syndrome

Answer

Ulcerative colitis

Answer

Celiac disease

Answer

Lymphoma

Question 3

A 30-year-old man presents with a 3-week history of fatigue, occasional fever, yellow skin and sclerae, tenderness below the right costal margin, and dark urine. Physical examination reveals jaundice and mild hepatomegaly. Laboratory studies show elevated serum levels of bilirubin, decreased albumin, and prolonged prothrombin time. Serologic tests disclose antibodies to hepatitis C virus. Which of the following tests is the most accurate method for assessing the extent of liver disease in this patient?

Accepted Answer

Liver biopsy

Answer

Serum alkaline phosphatase

Answer

Serum ammonia

Answer

Serum immunoglobulins

Question 4

What is the best test for intestinal malabsorption?

Accepted Answer

D-xylose test

Answer

NBT-PABA test

Answer

Fecal fat estimation

Answer

Schilling test

Question 5

Which is the test of choice for assessment of mucosal function of the GIT?

Accepted Answer

D-xylose test

Answer

Biopsy

Answer

Schilling test

Answer

Small bowel study

Question 6

Which of the following is FALSE regarding Primary Sclerosing Cholangitis (PSC)?

Accepted Answer

PSC in Ulcerative Colitis (UC) is associated in 30% of cases.

Answer

There is a low incidence of cholangitis.

Answer

There is an increased incidence of colonic carcinoma in PSC patients with UC.

Answer

Despite the presence of diffuse disease, the hepatic duct bifurcation is the most severely structured segment.

Question 7

Which of the following is a precancerous condition of the stomach?

Accepted Answer

Atrophic gastritis

Answer

Lipoma

Answer

Linitis plastica

Answer

Hyperacidity

Question 8

What is the first-line treatment for Wilson disease with neurologic or psychiatric manifestations?

Accepted Answer

Tetrathiomolybdate and Zinc

Answer

Trientine and Zinc

Answer

Zinc alone

Answer

d-Penicillamine alone

Question 9

Which of the following statements is FALSE about Blind loop syndrome?

Accepted Answer

Broad-spectrum antibiotics are sufficient treatment for anatomic stasis

Answer

Also called Bacterial overgrowth syndrome

Answer

Macrocytic anemia due to Cobalamin deficiency

Answer

Malabsorption of fat-soluble vitamins

Question 10

The Rockall scoring system is used for the assessment of which condition?

Accepted Answer

Non-variceal upper gastrointestinal bleeding

Answer

Variceal bleeding

Answer

Ectopic variceal bleeding

Answer

None of the above

Gastroenterology — MCQs

Gastroenterology — MCQs

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