Gastroenterology Practice Questions

Q: All of the following are criteria for irritable bowel syndrome except?

Blood and mucus in stool. **Explanation:** Irritable Bowel Syndrome (IBS) is a **functional gastrointestinal disorder**, meaning it is characterized by symptoms without any underlying structural, inflammatory, or biochemical abnormalities. The diagnosis is primarily clinical, based on the **Rome IV Criteria**. **1. Why "Blood and mucus in stool" is the correct answer:** The presence of blood in the stool is a major **"Red Flag" (Alarm Symptom)** [1]. It suggests an organic pathology such as Inflammatory Bowel Disease (IBD), malignancy, or infection, rather than a functional disorder like IBS. While clear mucus can sometimes be seen in IBS, blood is never a feature [1]. Its presence necessitates further investigation (e.g., colonoscopy). **2. Analysis of other options (Rome IV Criteria):** According to Rome IV, IBS is defined as recurrent abdominal pain (at least 1 day/week in the last 3 months) associated with **two or more** of the following: * **Option D (Related to defecation):** The pain is typically relieved by or associated with defecation [1]. * **Option A (Change in frequency):** Associated with a change in how often the patient has a bowel movement [1]. * **Option C (Change in form):** Associated with a change in the appearance (Bristol Stool Scale) of the stool [1]. **Clinical Pearls for NEET-PG:** * **Manning Criteria:** An older diagnostic tool; "passage of mucus" and "feeling of incomplete evacuation" are included here, but **blood** remains an exclusion [1]. * **Alarm Symptoms (Exclusion Criteria):** Weight loss >5kg, nocturnal diarrhea, anemia, onset after age 50, and family history of colorectal cancer [1]. * **Treatment:** High-fiber diet, antispasmodics (Dicyclomine), and for refractory cases, TCAs or SSRIs.

Q: What is the most common cause of non-alcoholic fatty liver disease?

Metabolic syndrome. **Explanation:** **Non-alcoholic Fatty Liver Disease (NAFLD)**, recently renamed **MASLD** (Metabolic Dysfunction-Associated Steatotic Liver Disease), is the most common cause of chronic liver disease worldwide [1]. **1. Why Metabolic Syndrome is Correct:** The pathogenesis of NAFLD is primarily driven by **insulin resistance**, which is the hallmark of **Metabolic Syndrome** [2]. Insulin resistance leads to increased lipolysis in adipose tissue and increased de novo lipogenesis in the liver [3]. This results in the accumulation of triglycerides within hepatocytes (steatosis). Metabolic syndrome—defined by obesity, type 2 diabetes, hypertension, and dyslipidemia—is present in the vast majority of patients with NAFLD. **2. Why Other Options are Incorrect:** * **Reye Syndrome:** This is an acute, life-threatening condition characterized by microvesicular steatosis and encephalopathy, typically occurring in children following a viral illness treated with **aspirin**. It is not a chronic cause of fatty liver. * **Cardiac Syndrome-X:** This refers to microvascular angina (chest pain with normal coronary arteries on angiogram). While it shares risk factors with metabolic syndrome, it is a cardiac diagnosis, not a cause of liver disease. * **Pregnancy:** While **Acute Fatty Liver of Pregnancy (AFLP)** is a serious condition occurring in the third trimester, it is a rare, acute obstetric emergency, not the primary cause of the global NAFLD epidemic. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Liver biopsy (shows macrovesicular steatosis). * **Most Common Cause of Death:** Cardiovascular disease (not liver failure) [1]. * **First-line Management:** Weight loss (7-10%) and lifestyle modification. * **Key Association:** NAFLD is considered the hepatic manifestation of metabolic syndrome [2].

Q: Cirrhosis of the liver with portal hypertension occurs in all of the following conditions except:

Schistosomiasis. The key to this question lies in the distinction between **cirrhosis** and **non-cirrhotic portal hypertension**. While all four options can lead to portal hypertension, **Schistosomiasis** (specifically *S. mansoni* and *S. japonicum*) causes portal hypertension without causing true cirrhosis [1]. **1. Why Schistosomiasis is the correct answer:** In Schistosomiasis, the parasite eggs lodge in the small branches of the portal vein, leading to a granulomatous reaction and intense **"pipestem" fibrosis (Symmers' fibrosis)**. Crucially, this process is **presinusoidal**. Because the pathology is limited to the portal tracts, the liver parenchyma and lobular architecture remain preserved. Since cirrhosis is defined by diffuse fibrosis *and* regenerative nodules that distort the entire liver architecture, Schistosomiasis does not meet the criteria for cirrhosis. **2. Why the other options are incorrect:** * **Wilson’s Disease:** A disorder of copper metabolism that leads to chronic hepatitis, which eventually progresses to macronodular cirrhosis [2]. * **Alpha-1 Antitrypsin Deficiency:** The accumulation of misfolded protein (PiZZ phenotype) in hepatocytes causes chronic liver injury, leading to cirrhosis and an increased risk of hepatocellular carcinoma [2], [3]. * **Cystic Fibrosis:** Thickened biliary secretions cause focal biliary cirrhosis, which can eventually become diffuse and lead to portal hypertension [2]. **Clinical Pearls for NEET-PG:** * **Schistosomiasis** is the most common cause of non-cirrhotic portal hypertension worldwide [1]. * **Presinusoidal Portal Hypertension:** Characterized by normal Wedged Hepatic Venous Pressure (WHVP) but elevated portal venous pressure. * **High-Yield Distinction:** In Schistosomiasis, liver function tests (synthetic function) are often preserved until very late stages, unlike in true cirrhosis where albumin and INR are early markers of failure [1].

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: A 22-year-old woman with bipolar disorder develops neurologic manifestations over one year, including resting and intention tremors, rigidity, chorea, dysphagia, and dysarthria. Physical examination reveals bilateral Babinski signs. She has ring-like deposits of green material in the corneas bilaterally, without decreased vision. One year later, she experiences a 3-week illness with nausea, vomiting, malaise, and scleral icterus. Laboratory findings include serum AST 100 U/L, ALT 122 U/L, alkaline phosphatase 105 U/L, total bilirubin 4.5 mg/dL, glucose 77 mg/dL, and creatinine 0.9 mg/dL. Serologic tests for hepatitis A, B, and C are negative. This episode resolves without treatment, but she eventually develops cirrhosis. A mutation in a gene encoding for what substance is most likely present in this woman?

Copper-transporting ATPase. ### Explanation The clinical presentation of a young patient with **neuropsychiatric symptoms** (bipolar disorder, tremors, chorea, dysarthria), **Kayser-Fleischer (KF) rings** (green corneal deposits), and **recurrent liver injury** leading to cirrhosis is pathognomonic for **Wilson Disease** (Hepatolenticular Degeneration) [1]. **1. Why the Correct Answer is Right:** Wilson disease is an autosomal recessive disorder caused by a mutation in the **ATP7B gene** on chromosome 13. This gene encodes a **copper-transporting P-type ATPase** located in the hepatocytes. This protein is essential for: * Incorporating copper into **apoceruloplasmin** to form ceruloplasmin. * Excreting excess copper into the **bile** [2]. Deficiency leads to copper accumulation in the liver, brain (basal ganglia), and cornea, causing the multisystem manifestations described [1]. **2. Why the Other Options are Wrong:** * **A. α1-Antitrypsin:** Deficiency causes neonatal jaundice or adult-onset cirrhosis and emphysema. It does not cause KF rings or extrapyramidal neurological symptoms. * **B. CFTR:** Mutations cause Cystic Fibrosis. While it can cause biliary cirrhosis, the primary features are respiratory infections and pancreatic insufficiency. * **D. Galactose-1-phosphate uridyltransferase:** Deficiency causes classic Galactosemia, which presents in **neonates** with cataracts, hepatomegaly, and jaundice upon starting milk. **3. NEET-PG High-Yield Pearls:** * **Diagnosis:** Best initial test is **Serum Ceruloplasmin** (decreased); Gold standard is **Liver Biopsy** (increased copper content). * **KF Rings:** Located in the **Descemet’s membrane** of the cornea; seen via slit-lamp exam. * **Treatment:** Chelators like **D-Penicillamine** (first-line) or Trientine; Zinc (prevents absorption). * **Hemolysis:** Wilson disease can present with Coombs-negative hemolytic anemia [1].

Question 1

The Bernstein test involves the infusion of 0.1 N HCl into the esophagus. This test is used to diagnose which of the following conditions?

Accepted Answer

Gastroesophageal reflux disorder

Answer

Achalasia cardia

Answer

Diffuse esophageal spasm

Answer

Esophageal malignancy

Question 2

A young boy presented with severe hematemesis. On examination, there was no hepatomegaly, but mild splenomegaly was present. Endoscopy shows esophageal varices. What is the most probable diagnosis?

Accepted Answer

Non-cirrhotic portal fibrosis

Answer

Veno occlusive disease

Answer

Budd-Chiari syndrome

Answer

Cirrhosis of the liver

Question 3

All of the following are criteria for irritable bowel syndrome except?

Accepted Answer

Blood and mucus in stool

Answer

Change in frequency of stool

Answer

Change in form of stool

Answer

Improves with defecation

Question 4

What is the most common cause of non-alcoholic fatty liver disease?

Accepted Answer

Metabolic syndrome

Answer

Reye syndrome

Answer

Cardiac syndrome-X

Answer

Pregnancy

Question 5

A 60-year-old male presents with progressive difficulty in swallowing, vomiting, and occasional regurgitation for the past 3 months. Barium studies showed marked dilatation of the upper esophagus with narrowing of the lower segment. Manometry showed absent esophageal peristalsis. The pathogenesis of this condition is most likely related to:

Accepted Answer

Absence of ganglion cells in the myenteric plexus of the esophagus

Answer

Reflux of gastric acid into the lower esophagus

Answer

Abnormal dilatation of the lower esophageal vein

Answer

Incompetence of the lower esophageal sphincter

Question 6

Cirrhosis of the liver with portal hypertension occurs in all of the following conditions except:

Accepted Answer

Schistosomiasis

Answer

Cystic fibrosis

Answer

Alpha 1 anti-trypsin deficiency

Answer

Wilson's disease

Question 7

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 8

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 9

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 10

A 22-year-old woman with bipolar disorder develops neurologic manifestations over one year, including resting and intention tremors, rigidity, chorea, dysphagia, and dysarthria. Physical examination reveals bilateral Babinski signs. She has ring-like deposits of green material in the corneas bilaterally, without decreased vision. One year later, she experiences a 3-week illness with nausea, vomiting, malaise, and scleral icterus. Laboratory findings include serum AST 100 U/L, ALT 122 U/L, alkaline phosphatase 105 U/L, total bilirubin 4.5 mg/dL, glucose 77 mg/dL, and creatinine 0.9 mg/dL. Serologic tests for hepatitis A, B, and C are negative. This episode resolves without treatment, but she eventually develops cirrhosis. A mutation in a gene encoding for what substance is most likely present in this woman?

Accepted Answer

Copper-transporting ATPase

Answer

a1-Antitrypsin

Answer

CFTR

Answer

Galactose-1-phosphate uridyltransferase

Gastroenterology — MCQs

Gastroenterology — MCQs

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