Gastroenterology Practice Questions

Q: The presence of anti-Saccharomyces cerevisiae antibody is a surrogate marker of which of the following conditions?

Crohn's disease. The presence of **Anti-Saccharomyces cerevisiae antibodies (ASCA)** is a highly specific serological marker for **Crohn’s Disease (CD)**. ASCA are directed against mannan, a component of the cell wall of the yeast *Saccharomyces cerevisiae*. In patients with Crohn’s disease, increased intestinal permeability and an aberrant immune response lead to the formation of these antibodies. * **Crohn’s Disease (Option B):** ASCA is positive in approximately 60-70% of CD cases [2]. When combined with p-ANCA (which is typically negative in CD), it has a high positive predictive value for the diagnosis. * **Ulcerative Colitis (Option C):** The characteristic marker for UC is **p-ANCA** (Perinuclear Anti-Neutrophil Cytoplasmic Antibodies), seen in 60-80% of patients. ASCA is usually negative in UC [1]. * **Celiac Disease (Option A):** This is an autoimmune response to gluten [3]. Key markers include **Anti-tissue Transglutaminase (tTG) IgA** (the screening test of choice) and **Anti-Endomysial antibodies (EMA)** [3]. * **Tropical Sprue (Option D):** This is a malabsorption syndrome caused by chronic small bowel infection; it does not have specific diagnostic autoantibodies and is diagnosed via clinical history and biopsy. **High-Yield Clinical Pearls for NEET-PG:** * **ASCA (+) / p-ANCA (-):** Highly suggestive of Crohn’s Disease. * **ASCA (-) / p-ANCA (+):** Highly suggestive of Ulcerative Colitis. * ASCA levels in Crohn’s disease are often associated with a more aggressive phenotype, including ileal involvement and fibrostenosing disease. * Remember the "Rule of C": **C**rohn's = AS**C**A; **U**lcerative Colitis = p-ANCA (often associated with **U**veitis/P-ANCA).

Q: Amyl nitrite inhalation test is used to detect which condition?

Achalasia cardia. **Explanation:** **Achalasia Cardia** is characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis [1]. The **Amyl Nitrite Inhalation Test** is a pharmacological provocative test used during barium swallow or manometry to differentiate Achalasia from mechanical obstructions (like Pseudoachalasia). 1. **Mechanism (Why B is correct):** Amyl nitrite is a potent smooth muscle relaxant. In patients with Achalasia, the LES hypertonicity is functional. Inhalation of amyl nitrite causes the LES to relax, allowing the barium column to drain into the stomach. This confirms that the obstruction is due to a functional motor disorder rather than a fixed anatomical lesion. 2. **Why other options are incorrect:** * **Carcinoma Esophagus:** This is a mechanical/organic obstruction. Amyl nitrite will not relax a malignant stricture; therefore, the barium column will remain unchanged. * **Esophageal Diverticulum:** These are structural outpouchings (e.g., Zenker’s) diagnosed by barium swallow based on anatomy, not smooth muscle response [1]. * **Tracheoesophageal Fistula:** This is a congenital or acquired communication between the trachea and esophagus, diagnosed via imaging or endoscopy, unrelated to LES tone. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows "incomplete LES relaxation" and "aperistalsis") [1]. * **Barium Swallow Sign:** "Bird’s Beak" or "Rat-tail" appearance. * **Heller’s Myotomy:** The surgical treatment of choice. * **Chagas Disease:** A common secondary cause of Achalasia (caused by *Trypanosoma cruzi*).

Q: Hemochromatosis is associated with all features except?

Gastric atrophy. **Explanation:** Hereditary Hemochromatosis is an autosomal recessive disorder (most commonly involving the **HFE gene**) characterized by excessive iron absorption and deposition in various parenchymal organs, leading to tissue damage and functional failure [1]. **Why Gastric Atrophy is the Correct Answer:** Iron deposition in Hemochromatosis typically affects the liver, pancreas, heart, joints, and pituitary gland. It **does not involve the stomach mucosa** or cause gastric atrophy. Gastric atrophy is more commonly associated with autoimmune processes (Pernicious anemia) or chronic *H. pylori* infection. **Analysis of Other Options:** * **Hypogonadism:** This is a classic feature caused by iron deposition in the **anterior pituitary gland**, leading to hypogonadotropic hypogonadism [1]. It manifests as decreased libido, impotence, and testicular atrophy. * **Skin Pigmentation:** Often described as "bronzing" of the skin, this occurs due to both increased **melanin production** and direct iron deposition (hemosiderin) in the dermis [1]. * **Micronodular Cirrhosis:** The liver is the primary site of iron storage. Chronic iron overload leads to oxidative stress, fibrosis, and eventually **micronodular cirrhosis**, which significantly increases the risk of Hepatocellular Carcinoma (HCC) [1]. **NEET-PG High-Yield Pearls:** * **Classic Triad:** "Bronze Diabetes" (Skin pigmentation, Diabetes Mellitus, and Cirrhosis) [1]. * **Arthropathy:** Characteristically involves the 2nd and 3rd metacarpophalangeal (MCP) joints with "hook-like" osteophytes. * **Cardiac Involvement:** Can lead to restrictive or dilated cardiomyopathy and arrhythmias. * **Diagnosis:** Best initial test is **Transferrin Saturation** (>45%); Gold standard is **MRI (T2*)** or Liver Biopsy (Perls' Prussian Blue stain) [2]. * **Treatment:** Therapeutic phlebotomy is the mainstay of management [2].

Q: A 61-year-old man presents with a 5-year history of pain in both legs during exercise. He has been treated for diabetes for 8 years and his fasting blood glucose is 280 mg/dL. Which of the following best explains the pathogenesis of leg pain in this patient?

Atherosclerosis. The patient presents with classic **intermittent claudication** (pain in legs during exercise, relieved by rest), a hallmark of **Peripheral Arterial Disease (PAD)** [1]. **1. Why Atherosclerosis is correct:** Diabetes mellitus is a major independent risk factor for **atherosclerosis**. Chronic hyperglycemia leads to endothelial dysfunction, increased oxidative stress, and the formation of Advanced Glycation End-products (AGEs). These processes accelerate the buildup of fibro-fatty plaques in large and medium-sized arteries (Macroangiopathy). In the lower extremities, these plaques narrow the arterial lumen, leading to ischemia during periods of high oxygen demand (exercise), which manifests as claudication [1]. **2. Why other options are incorrect:** * **Malignant hypertension:** Characterized by severe BP elevation (usually >180/120 mmHg) with end-organ damage (papilledema, encephalopathy). It does not typically present as chronic, exercise-induced leg pain. * **Microaneurysms:** These are characteristic of **diabetic retinopathy** (Kimmelstiel-Wilson lesions in the kidney are different) and involve microvascular damage, not the large-vessel occlusion seen in claudication. * **Peripheral neuropathy:** While common in diabetics, neuropathic pain is typically "burning" or "tingling" in nature, occurs at rest (often worse at night), and follows a "stocking-glove" distribution [2]. It is not specifically triggered by exercise [2]. **Clinical Pearls for NEET-PG:** * **Ankle-Brachial Index (ABI):** The best initial diagnostic test for PAD. An ABI **< 0.9** is diagnostic [1]. * **Monckeberg Arteriosclerosis:** Medial calcific sclerosis common in diabetics; it causes non-compressible arteries and falsely elevated ABI readings. * **Risk Factors:** Smoking is the strongest modifiable risk factor for PAD, followed by Diabetes. * **Management:** Cilostazol (PDE-3 inhibitor) is used for symptomatic relief of claudication.

Q: Which of the following statements is false regarding Primary Sclerosing Cholangitis?

It is more common in females. **Explanation:** **Primary Sclerosing Cholangitis (PSC)** is a chronic cholestatic liver disease characterized by inflammation and obliterative fibrosis of both intrahepatic and extrahepatic bile ducts [1]. **1. Why Option C is the Correct (False) Statement:** Unlike many autoimmune liver diseases (like Primary Biliary Cholangitis), **PSC is more common in males**, with a male-to-female ratio of approximately **2:1** [1]. The median age at diagnosis is around 40 years [1]. **2. Analysis of Other Options:** * **Option A (Beaded Appearance):** This is the classic radiologic hallmark. Multifocal strictures alternating with normal or dilated segments create a **"string of beads"** appearance on MRCP or ERCP. * **Option B (CBD Involvement):** In PSC, the **entire biliary tree** is typically involved. The common bile duct (CBD) is affected in the vast majority of cases, often leading to generalized cholestasis [1]. * **Option D (Caudate Lobe Hypertrophy):** Due to chronic biliary obstruction and subsequent cirrhosis, the liver undergoes structural remodeling. Similar to Budd-Chiari syndrome, the **caudate lobe often undergoes compensatory hypertrophy** while the right and left lobes may atrophy. **High-Yield Clinical Pearls for NEET-PG:** * **Strong Association:** ~70-80% of patients with PSC have coexisting **Ulcerative Colitis** (UC) [1]. However, only 4-5% of UC patients develop PSC. * **Serology:** Most specific marker is **p-ANCA** (positive in 60-80%) [1]. * **Gold Standard Investigation:** **MRCP** is now the initial diagnostic test of choice (non-invasive). * **Malignancy Risk:** PSC is a major risk factor for **Cholangiocarcinoma** (10-15% lifetime risk) and Gallbladder cancer. * **Histology:** Classic finding is **"Onion-skin fibrosis"** (periductal concentric fibrosis).

Q: Diarrhoea is a feature of all the following conditions or treatments except:

Steroids. **Explanation:** The correct answer is **Steroids**. In clinical practice, corticosteroids (like Prednisolone or Dexamethasone) are actually used to **treat** inflammatory causes of diarrhoea (e.g., Inflammatory Bowel Disease) rather than causing it. In fact, a common side effect of steroids is constipation, not diarrhoea. **Analysis of Options:** * **Pellagra (Option A):** Characterized by the "4 Ds": **D**ermatitis, **D**iarrhoea, **D**ementia, and **D**eath. It is caused by a deficiency of Niacin (Vitamin B3) or its precursor, Tryptophan. * **Diabetes Mellitus (Option B):** Chronic diabetes leads to **autonomic neuropathy**. Damage to the enteric nervous system results in disordered intestinal motility (diabetic enteropathy), leading to "diabetic diarrhoea," which is often nocturnal and painless [3]. * **Antibiotic Therapy (Option C):** Antibiotics disrupt the normal gut flora [2]. This can lead to simple antibiotic-associated diarrhoea or the more severe **Pseudomembranous colitis** caused by *Clostridioides difficile* overgrowth [2]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Steroids and the Gut:** While steroids don't cause diarrhoea, they are notorious for causing **Peptic Ulcer Disease (PUD)** and gastroduodenal irritation, especially when combined with NSAIDs. 2. **Pellagra Triggers:** Can be seen in populations consuming **maize** (corn) as a staple diet (low in available niacin) or **Hartnup disease** (impaired tryptophan absorption). 3. **Diabetic Diarrhoea Treatment:** Often managed with loperamide [1] or, in cases of bacterial overgrowth, rotating antibiotics [3]. 4. **C. difficile:** The drug of choice for *C. difficile* infection is now **Oral Vancomycin** or Fidaxomicin (Metronidazole is no longer first-line for all cases).

Q: What is the most common cause of malabsorption?

Sprue. **Explanation:** **Correct Answer: C. Sprue** Malabsorption is a clinical syndrome resulting from the impaired absorption of nutrients across the intestinal mucosa. Globally and historically, **Sprue** (specifically Celiac Sprue and Tropical Sprue) remains the most common cause of generalized malabsorption [1]. * **Celiac Sprue** is an immune-mediated enteropathy triggered by gluten, leading to villous atrophy and a significant reduction in the surface area available for absorption [1]. * **Tropical Sprue** is a chronic diarrheal illness (likely post-infectious) prevalent in tropical regions, characterized by megaloblastic anemia and malabsorption of fat and Vitamin B12 [2]. **Analysis of Incorrect Options:** * **A & B (Intestinal and Gastric Surgery):** While surgeries like Roux-en-Y gastric bypass or extensive bowel resection (Short Bowel Syndrome) cause malabsorption, they are iatrogenic and occur only in a specific subset of the population. They are not as prevalent as primary mucosal diseases. * **D (Intestinal Parasite):** While Giardia lamblia and Strongyloides can cause malabsorption, they typically present as acute or chronic diarrhea rather than the classic, widespread malabsorption syndrome seen in Sprue. **High-Yield NEET-PG Pearls:** * **Gold Standard Diagnosis for Celiac Disease:** Intestinal biopsy showing villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes [1]. * **Screening Test for Celiac:** Anti-tissue transglutaminase (anti-tTG) IgA antibodies [1]. * **D-Xylose Test:** Used to differentiate mucosal malabsorption (e.g., Sprue) from pancreatic insufficiency (D-xylose absorption is normal in pancreatic disease). * **Site of Absorption:** Iron is absorbed in the duodenum; Folate in the jejunum; Vitamin B12 and Bile salts in the terminal ileum.

Q: All are features seen in chronic pancreatitis except?

Paralytic ileus. Chronic pancreatitis is a progressive inflammatory disorder characterized by irreversible destruction of the pancreatic parenchyma, leading to both exocrine and endocrine insufficiency [1]. **Why Paralytic Ileus is the Correct Answer:** **Paralytic ileus** is a feature of **Acute Pancreatitis**, not chronic [3]. In acute pancreatitis, the intense peripancreatic inflammation causes a localized "sentinel loop" or generalized ileus due to irritation of the surrounding bowel [3]. Chronic pancreatitis, being a slow, fibrotic process, does not typically present with acute intestinal dysmotility. **Analysis of Incorrect Options:** * **Chronic persistent pain:** This is the most common symptom [1]. It is typically epigastric, radiates to the back, and is caused by increased intrapancreatic pressure, neural inflammation, and ductal obstruction. * **Diarrhea and Steatorrhea:** These occur due to **exocrine insufficiency**. Steatorrhea (foul-smelling, oily stools) typically manifests only when >90% of the pancreatic lipase-secreting capacity is lost. * **Calcification:** Intraductal calcifications are a hallmark of chronic pancreatitis (especially alcoholic and tropical types) [2]. They are easily visualized on a plain X-ray or CT scan and are considered pathognomonic [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Pancreatic calcification, steatorrhea, and diabetes mellitus (seen in advanced cases). * **Most Common Cause:** Alcohol abuse (Adults); Cystic Fibrosis (Children). * **Investigation of Choice:** **MRCP** is the most sensitive non-invasive test for ductal changes; **CT scan** is best for visualizing calcifications [2]. * **Fecal Elastase-1:** The most sensitive and specific non-invasive screening test for exocrine insufficiency [2]. * **TIGAR-O classification:** Used to categorize risk factors (Toxic-metabolic, Idiopathic, Genetic, Autoimmune, Recurrent/Severe acute pancreatitis, Obstructive).

Question 1

The presence of anti-Saccharomyces cerevisiae antibody is a surrogate marker of which of the following conditions?

Accepted Answer

Crohn's disease

Answer

Celiac disease

Answer

Ulcerative colitis

Answer

Tropical sprue

Question 2

Gastric erosions are likely to be associated with which of the following conditions?

Accepted Answer

Pernicious anaemia

Answer

Cor pulmonale

Answer

Polycythemia rubra vera

Answer

Hepatic cirrhosis

Question 3

Amyl nitrite inhalation test is used to detect which condition?

Accepted Answer

Achalasia cardia

Answer

Carcinoma esophagus

Answer

Oesophageal diverticulum

Answer

Transeoesophageal fistula

Question 4

Hemochromatosis is associated with all features except?

Accepted Answer

Gastric atrophy

Answer

Hypogonadism

Answer

Skin pigmentation

Answer

Micronodular cirrhosis

Question 5

A 61-year-old man presents with a 5-year history of pain in both legs during exercise. He has been treated for diabetes for 8 years and his fasting blood glucose is 280 mg/dL. Which of the following best explains the pathogenesis of leg pain in this patient?

Accepted Answer

Atherosclerosis

Answer

Malignant hypertension

Answer

Microaneurysms

Answer

Peripheral neuropathy

Question 6

Which of the following statements is false regarding Primary Sclerosing Cholangitis?

Accepted Answer

It is more common in females

Answer

Shows a beaded appearance of the biliary tree on imaging

Answer

The common bile duct is almost always involved

Answer

The caudate lobe undergoes hypertrophy

Question 7

Diarrhoea is a feature of all the following conditions or treatments except:

Accepted Answer

Steroids

Answer

Pellagra

Answer

Diabetes mellitus

Answer

Antibiotic therapy

Question 8

What is the most common cause of malabsorption?

Accepted Answer

Sprue

Answer

Intestinal surgery

Answer

Gastric surgery

Answer

Intestinal parasite

Question 9

In chronic pancreatitis, which symptom typically appears?

Accepted Answer

Steatorrhea

Answer

Weight gain

Answer

Increased appetite

Answer

Diabetes insipidus

Question 10

All are features seen in chronic pancreatitis except?

Accepted Answer

Paralytic ileus

Answer

Chronic persistent pain

Answer

Diarrhea, Steatorrhea

Answer

Calcification

Gastroenterology — MCQs

Gastroenterology — MCQs

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