Gastroenterology Practice Questions

Q: Lalloo, 60 years of age, a known case of cirrhosis of the liver, presents with increased levels of Alpha-fetoprotein and hepatomegaly 3 cm below the costal margin. Ultrasonography showed lesions involving the right lobe of the liver. What is the most probable diagnosis?

Hepatocellular carcinoma. The clinical presentation of a patient with **pre-existing cirrhosis**, new-onset **hepatomegaly**, and significantly **elevated Alpha-fetoprotein (AFP)** levels is a classic triad for **Hepatocellular Carcinoma (HCC)**. In a cirrhotic liver, any new focal lesion should be considered HCC until proven otherwise [1]. AFP is a highly specific tumor marker for HCC when levels are significantly raised (typically >200 ng/mL) [1]. **Why other options are incorrect:** * **Focal Nodular Hyperplasia (FNH):** This is a benign "leave-me-alone" lesion usually found in young females. It is not associated with cirrhosis or elevated AFP and typically shows a characteristic "central stellate scar" on imaging. * **Hepatic Adenoma:** This is a benign tumor strongly associated with oral contraceptive use or glycogen storage diseases. It carries a risk of rupture but does not typically occur in a background of cirrhosis or cause high AFP levels. * **Metastasis:** While the liver is a common site for metastases, they usually present as multiple "umbilicated" nodules. Furthermore, primary liver cirrhosis is a stronger risk factor for primary HCC than for secondary metastasis, and AFP is specific to primary liver cell origin. **High-Yield NEET-PG Pearls:** * **Screening for HCC:** Patients with cirrhosis should undergo screening every 6 months using **Ultrasonography + AFP** [1]. * **Diagnosis:** Unlike most cancers, HCC can often be diagnosed based on imaging (Triphasic CT/MRI) without a biopsy if the lesion shows **arterial phase enhancement** and **venous phase washout** [1]. * **Risk Factors:** Hepatitis B (can cause HCC even without cirrhosis), Hepatitis C, Alcohol, and Aflatoxin B1.

Q: The D-Xylose test is primarily used in the diagnosis of which condition?

Malabsorption syndrome. The **D-Xylose test** is a classic diagnostic tool used to assess the integrity of the proximal small intestinal mucosa. D-Xylose is a pentose sugar that is absorbed via passive diffusion in the jejunum and does not require pancreatic enzymes for digestion. **Why Malabsorption Syndrome is correct:** In conditions causing **mucosal malabsorption** (e.g., Celiac disease, Tropical sprue, or Whipple’s disease), the damaged intestinal lining cannot absorb D-Xylose efficiently [1]. Consequently, blood levels of D-Xylose remain low, and urinary excretion is decreased. This helps clinicians differentiate between **mucosal causes** of malabsorption (low D-Xylose) and **maldigestion** due to pancreatic insufficiency (normal D-Xylose, as pancreatic enzymes are not needed for its absorption) [2]. **Why other options are incorrect:** * **Zinc deficiency:** Diagnosed via serum zinc levels; D-Xylose does not track trace element absorption. * **Vitamin B12 deficiency:** Traditionally assessed via the Schilling test (now largely historical) or serum B12/Methylmalonic acid levels. B12 absorption occurs in the terminal ileum and requires Intrinsic Factor. * **Bacterial overgrowth syndrome (SIBO):** While SIBO can cause a false positive (low D-Xylose) because bacteria metabolize the sugar before absorption, the test is not the primary diagnostic modality [3]. The gold standard for SIBO is a jejunal aspirate culture or carbohydrate breath tests (e.g., Lactulose/Glucose). **High-Yield Clinical Pearls for NEET-PG:** * **Normal Result:** >4g excreted in urine over 5 hours (after a 25g oral dose). * **False Positives:** Low urinary D-Xylose can occur in **renal insufficiency**, ascites, or delayed gastric emptying, even if the mucosa is healthy. * **Key Distinction:** D-Xylose test is **Normal in Chronic Pancreatitis** but **Abnormal in Celiac Disease.**

Q: What is the most likely underlying diagnosis?

Cirrhosis. ***Cirrhosis*** - The **classic physical signs** such as **leukonychia (white nails)** or **spider nevi** are pathognomonic features of **chronic liver disease** and cirrhosis. - These manifestations result from **decreased albumin synthesis** and **altered hormone metabolism** in advanced liver disease. *Chronic renal failure* - While CRF can cause **nail changes**, it typically presents with **half-and-half nails** (proximal white, distal pink) rather than complete leukonychia. - Associated findings include **uremic frost**, **pallor**, and **pitting edema**, which are distinct from hepatic signs. *Hypothyroidism* - Nail changes in hypothyroidism include **brittle, slow-growing nails** and **onycholysis**, not the white discoloration seen in liver disease. - Classic features include **myxedema**, **bradycardia**, and **delayed deep tendon reflexes**. *Myeloma* - **Multiple myeloma** primarily affects bones and causes **lytic lesions**, **hypercalcemia**, and **renal dysfunction**. - Nail changes are not characteristic features, and patients typically present with **bone pain** and **recurrent infections**.

Q: What is the "string sign" of Kantor seen in?

Crohn's disease. The **"String sign of Kantor"** is a classic radiological finding seen on a barium meal follow-through (BMFT) in patients with **Crohn’s disease** [1]. It represents a thin, string-like appearance of the barium column in the terminal ileum [1]. This occurs due to severe narrowing of the intestinal lumen caused by transmural inflammation, thickening of the bowel wall, and intense spasms . **Why the other options are incorrect:** * **Ulcerative colitis:** This condition typically involves the colon and rectum (sparing the small intestine). The characteristic radiological finding is the **"Lead pipe appearance"** (loss of haustrations) due to chronic inflammation and fibrosis. * **Cholecystitis:** This is inflammation of the gallbladder, usually diagnosed via ultrasound (showing wall thickening or pericholecystic fluid) or HIDA scan, not by signs of intestinal luminal narrowing. * **Appendicitis:** While it can cause ileal irritation, it is primarily diagnosed clinically or via CT/Ultrasound. A specific radiological sign associated with it is the "inverted 3 sign" or "cecal bar," but not the string sign. **High-Yield Clinical Pearls for NEET-PG:** * **Kantor’s String Sign:** Terminal ileum narrowing in Crohn’s [1]. * **Stierlin’s Sign:** Rapid emptying of the cecum due to irritability (seen in Ileocecal TB and Crohn's). * **Cobblestone Appearance:** Seen on endoscopy in Crohn's due to deep longitudinal ulcers and intervening normal mucosa. * **Creeping Fat:** Mesenteric fat wrapping around the bowel, pathognomonic for Crohn’s disease. * **Skip Lesions:** Discontinuous areas of involvement, a hallmark of Crohn's .

Q: A patient with antral carcinoma repeatedly vomits. Which of the following is NOT typically seen?

Acidosis. **Explanation:** Antral carcinoma causing gastric outlet obstruction (GOO) leads to repeated vomiting of gastric contents. The characteristic metabolic derangement in this scenario is **Metabolic Alkalosis**, not acidosis. **1. Why Acidosis is the Correct Answer (The "NOT" seen feature):** Gastric juice is rich in hydrochloric acid (HCl). Repeated vomiting results in a massive loss of hydrogen ions ($H^+$). To compensate, the body shifts towards an alkaline state, leading to **Metabolic Alkalosis** (specifically, hypochloremic hypokalemic metabolic alkalosis). Therefore, acidosis is not typically seen. **2. Why the other options are wrong (Features that ARE seen):** * **Hypochloremia (D):** Gastric juice contains high concentrations of chloride ($Cl^-$). Vomiting leads to direct depletion of chloride, which is the primary driver of the alkalosis. * **Hyponatremia (C):** Sodium is lost both in the vomitus and through the kidneys. As the body becomes dehydrated, ADH is secreted, which retains water and further dilutes serum sodium. * **Hypokalemia (B):** This occurs due to three reasons: direct loss in vomitus, renal loss (as the kidney exchanges $K^+$ for $H^+$ to conserve acid), and the "aldosterone effect" triggered by volume depletion. **Clinical Pearls for NEET-PG:** * **Paradoxical Aciduria:** In severe GOO, despite systemic alkalosis, the urine becomes acidic. This happens because the kidney, faced with severe volume depletion, prioritizes sodium reabsorption in exchange for $H^+$ ions (via the $Na^+/H^+$ pump) once $K^+$ stores are exhausted. * **Treatment of Choice:** The initial management for this metabolic state is **0.9% Normal Saline** (to correct volume and chloride) with **Potassium supplementation**. * **Classic Triad:** Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria.

Q: Pseudoachalasia is associated with all of the following conditions EXCEPT?

Rosary esophagus. **Explanation:** **Pseudoachalasia** (also known as secondary achalasia) is a clinical condition that mimics the clinical, manometric, and radiographic features of primary achalasia (e.g., failure of LES relaxation and aperistalsis) [1]. However, unlike primary achalasia, which is idiopathic, pseudoachalasia is caused by an underlying secondary process—most commonly a malignancy [2]. **Why "Rosary Esophagus" is the correct answer:** **Rosary esophagus** (or "corkscrew esophagus") is the classic radiographic finding on a barium swallow for **Diffuse Esophageal Spasm (DES)** [1]. DES is a primary motility disorder characterized by high-amplitude, non-peristaltic contractions. It is a distinct entity and is not a cause or feature of pseudoachalasia. **Analysis of incorrect options:** * **Esophageal tumor & Carcinoma of the gastric fundus:** These are the most common causes of pseudoachalasia. Malignant infiltration of the esophageal wall or the myenteric (Auerbach’s) plexus at the gastroesophageal junction leads to mechanical obstruction and impaired relaxation of the LES [2]. * **Paraneoplastic syndrome:** Certain malignancies (notably small cell lung cancer) can cause pseudoachalasia via a paraneoplastic mechanism, where antibodies (like anti-Hu) attack the esophageal neurons, mimicking the idiopathic disease [2]. **Clinical Pearls for NEET-PG:** * **Red Flags for Pseudoachalasia:** Age >60 years, rapid weight loss, and short duration of symptoms (<6 months). Primary achalasia usually presents in younger patients with a more chronic course. * **Diagnostic Clue:** If an endoscope cannot pass through the LES easily ("pop" sensation), it suggests primary achalasia; if there is a fixed, rigid narrowing, suspect pseudoachalasia (malignancy) [2]. * **Chagas Disease:** Caused by *Trypanosoma cruzi*, this is another cause of secondary achalasia (common in South America).

Question 1

Lalloo, 60 years of age, a known case of cirrhosis of the liver, presents with increased levels of Alpha-fetoprotein and hepatomegaly 3 cm below the costal margin. Ultrasonography showed lesions involving the right lobe of the liver. What is the most probable diagnosis?

Accepted Answer

Hepatocellular carcinoma

Answer

Focal nodular hyperplasia

Answer

Hepatic adenoma

Answer

Metastasis

Question 2

The D-Xylose test is primarily used in the diagnosis of which condition?

Accepted Answer

Malabsorption syndrome

Answer

Zinc deficiency

Answer

Vitamin B12 deficiency

Answer

Bacterial overgrowth syndrome

Question 3

For a client in hepatic coma, which outcome indicates the most appropriate improvement?

Accepted Answer

The client is oriented to time, place, and person.

Answer

The client exhibits no ecchymotic areas.

Answer

The client increases oral intake to 2,000 calories/day.

Answer

The client exhibits an increased serum albumin level.

Question 4

What is the most likely underlying diagnosis?

Accepted Answer

Cirrhosis

Answer

Chronic renal failure

Answer

Hypothyroidism

Answer

Myeloma

Question 5

What is the "string sign" of Kantor seen in?

Accepted Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Cholecystitis

Answer

Appendicitis

Question 6

A patient with antral carcinoma repeatedly vomits. Which of the following is NOT typically seen?

Accepted Answer

Acidosis

Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypochloremia

Question 7

Which of the following is NOT a cause of acute pancreatitis?

Accepted Answer

Hypercalcemia

Answer

Increased amylase level

Answer

Subcutaneous fat necrosis

Answer

Hyperlipidemia

Question 8

Which of the following statements regarding peptic ulcer disease is true?

Accepted Answer

Helicobacter pylori infection is known to increase the incidence of gastric ulcers.

Answer

Anterior ulcers bleed more commonly than posterior ulcers.

Answer

Posteriorly perforated ulcers always require conservative management.

Answer

Anti-Helicobacter pylori drugs must always be included in the treatment regimen for peptic ulcer disease.

Question 9

Pseudoachalasia is associated with all of the following conditions EXCEPT?

Accepted Answer

Rosary esophagus

Answer

Esophageal tumor

Answer

Paraneoplastic syndrome

Answer

Carcinoma of the gastric fundus

Question 10

Duodenal ulcer is most commonly caused by:

Accepted Answer

H. pylori

Answer

GERD

Answer

NSAID therapy

Answer

Stress ulcer

Gastroenterology — MCQs

Gastroenterology — MCQs

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