Gastroenterology Practice Questions

Q: A 17-year-old female, 6 weeks postpartum, presents with increased jaundice, abdominal pain, nausea, vomiting, and fever. Examination reveals jaundice, right upper quadrant pain with guarding, and a clear chest. Chest radiographs are normal. Which of the following tests is most likely to reveal the cause of this pain?

Ultrasound of the right upper quadrant. The clinical presentation of jaundice, right upper quadrant (RUQ) pain, fever, and vomiting in a postpartum female strongly suggests **acute cholecystitis** or **choledocholithiasis**. Pregnancy and the immediate postpartum period are significant risk factors for gallstone formation due to progesterone-induced gallbladder stasis and estrogen-induced increases in bile cholesterol saturation [2]. **Why Ultrasound is the Correct Choice:** Ultrasound of the RUQ is the **initial investigation of choice** for suspected biliary tract disease [2]. It is highly sensitive (up to 95%) and specific for detecting gallstones, gallbladder wall thickening, pericholecystic fluid, and biliary ductal dilatation. It is non-invasive, cost-effective, and avoids radiation, making it the gold standard for diagnosing the cause of RUQ pain in this demographic. **Why Other Options are Incorrect:** * **Serum Chemistries (A):** While Liver Function Tests (LFTs) can confirm cholestasis (elevated bilirubin/alkaline phosphatase), they cannot differentiate between the mechanical causes of obstruction (e.g., stones vs. strictures). * **CBC (B):** A CBC may show leukocytosis [1], indicating inflammation or infection, but it is non-specific and does not identify the anatomical cause of the pain. * **Upper GI Series (D):** This involves barium swallow/follow-through, which is used for mucosal or structural abnormalities of the esophagus, stomach, and duodenum. It has no role in evaluating the biliary tree. **NEET-PG High-Yield Pearls:** * **The "4 F’s" of Gallstones:** Female, Fat, Fertile, Forty. * **Charcot’s Triad:** Fever, Jaundice, and RUQ pain (indicative of Ascending Cholangitis). * **Murphy’s Sign:** Cessation of inspiration on deep palpation of the RUQ; a classic physical exam finding for acute cholecystitis [1]. * **HIDA Scan:** The most sensitive *confirmatory* test for acute cholecystitis if ultrasound is inconclusive.

Q: Fistula formation is most common in which of the following conditions?

Crohn's disease. **Explanation:** The hallmark of **Crohn’s Disease** that leads to fistula formation is **transmural inflammation**. Unlike other inflammatory conditions, Crohn’s involves all layers of the bowel wall (mucosa to serosa). This deep, penetrating inflammation leads to the formation of sinus tracts that eventually penetrate through the serosa into adjacent structures, resulting in **fistulae** (entero-enteric, entero-vesical, entero-vaginal, or perianal). **Analysis of Options:** * **Ulcerative Colitis (B):** Inflammation is strictly limited to the **mucosa and submucosa**. Because it does not involve the full thickness of the wall, fistulae and perforations are rare. * **Infective Enterocolitis (C):** While infections like Salmonellosis or Amoebiasis cause acute mucosal ulceration, they rarely lead to chronic transmural tract formation or fistulae. (Note: Intestinal TB can cause fistulae, but Crohn’s remains the most common association in a general GI context). * **Celiac Sprue (D):** This is an immune-mediated enteropathy characterized by villous atrophy and malabsorption. It does not involve deep ulceration or transmural destruction. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for Crohn's fistula:** Entero-enteric (between two loops of bowel). * **Perianal disease:** Fissures, fistulae, and skin tags are highly suggestive of Crohn’s over UC. * **String Sign of Kantor:** Seen on barium studies in Crohn’s due to terminal ileal narrowing. * **Creeping Fat:** Mesenteric fat wrapping around the bowel is a pathognomonic surgical finding in Crohn’s. * **Skip Lesions:** Crohn’s is patchy, whereas UC is continuous and starts from the rectum.

Q: Which of the following is NOT a complication of cirrhosis?

Haemophilia. The correct answer is **Haemophilia**. **1. Why Haemophilia is NOT a complication:** Haemophilia is an **X-linked recessive genetic disorder** [1] characterized by a deficiency of specific clotting factors (Factor VIII in Haemophilia A, Factor IX in Haemophilia B). It is a congenital condition present from birth. While cirrhosis causes bleeding tendencies, it does so through acquired mechanisms, not by causing the genetic mutations that define haemophilia. **2. Analysis of Incorrect Options:** * **Coagulopathy:** The liver synthesizes almost all coagulation factors (except Factor VIII and vWF). In cirrhosis, synthetic dysfunction leads to decreased levels of Factors II, VII, IX, and X. Additionally, impaired bile flow reduces Vitamin K absorption, further worsening the coagulopathy [1]. * **Splenomegaly:** Portal hypertension [2] causes "congestive splenomegaly." Increased pressure in the portal vein backs up into the splenic vein, leading to splenic sequestration of platelets (thrombocytopenia). * **Osteoporosis:** Known as **Hepatic Osteodystrophy**, this is a common but often overlooked complication. It occurs due to Vitamin D malabsorption, chronic inflammation (TNF-α), and the direct inhibitory effect of bilirubin and alcohol on osteoblasts. **Clinical Pearls for NEET-PG:** * **Factor VIII:** This is the only clotting factor **not** synthesized by hepatocytes (it is produced by sinusoidal endothelial cells). Therefore, Factor VIII levels are often **normal or elevated** in liver failure, helping differentiate DIC from liver disease. * **Child-Pugh Score:** Remember the mnemonic **ABCDE** for parameters: **A**lbumin, **B**ilirubin, **C**oagulation (INR), **D**istension (Ascites), and **E**ncephalopathy [2]. * **Most common cause of death** in cirrhosis is variceal bleeding or complications of hepatic encephalopathy/sepsis [3].

Q: Which of the following diseases causes achalasia?

Chaga's disease. **Explanation:** **Achalasia Cardia** is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis [1]. This occurs due to the degeneration of the **myenteric (Auerbach’s) plexus** in the esophageal wall [1]. **Why Chagas Disease is correct:** Chagas disease, caused by the protozoan parasite ***Trypanosoma cruzi***, is the most common cause of **secondary achalasia** (also known as Pseudoachalasia). The parasite releases toxins that lead to the destruction of the inhibitory postganglionic neurons in the myenteric plexus. This results in a clinical picture identical to idiopathic achalasia, often accompanied by other "mega" syndromes like megacolon and dilated cardiomyopathy. **Analysis of Incorrect Options:** * **Kala-azar (Visceral Leishmaniasis):** Caused by *Leishmania donovani*, it primarily affects the reticuloendothelial system, leading to hepatosplenomegaly and pancytopenia, not esophageal motility. * **KFD (Kyasanur Forest Disease):** A viral hemorrhagic fever transmitted by ticks. It presents with high fever, headache, and bleeding manifestations, with no link to achalasia. * **Schistosomiasis:** Primarily causes portal hypertension (due to liver fibrosis) or urinary tract complications, depending on the species (*S. mansoni* vs. *S. haematobium*). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow Sign:** "Bird’s Beak" or "Rat-tail" appearance. * **Pathology:** Loss of NO-producing inhibitory neurons (Nitric Oxide and VIP) [1]. * **Treatment of Choice:** Heller’s Myotomy (often with Dor/Toupet fundoplication) or POEM (Peroral Endoscopic Myotomy).

Q: Which of the following anemias is a risk factor for the development of gastric carcinoma?

Pernicious anaemia. Explanation: Pernicious Anemia (Option A) is the correct answer because it is an autoimmune condition characterized by the destruction of gastric parietal cells [1]. This leads to Type A Chronic Atrophic Gastritis, primarily affecting the fundus and body of the stomach [1]. The resulting chronic inflammation and achlorhydria (lack of acid) trigger compensatory hypergastrinemia. Over time, the gastric mucosa undergoes intestinal metaplasia, which is a well-established precancerous lesion. Patients with pernicious anemia have a 3- to 6-fold increased risk of developing Gastric Adenocarcinoma and are also at risk for Gastric Carcinoid tumors (Neuroendocrine tumors) [2]. Incorrect Options: * Megaloblastic Anemia (Option B): This is a broad morphological category caused by Vitamin B12 or Folate deficiency [3]. While pernicious anemia is a *cause* of megaloblastic anemia, not all megaloblastic anemias (e.g., those due to dietary deficiency or folate malabsorption) involve the gastric pathology required to increase cancer risk. * Aplastic Anemia (Option C): This is a bone marrow failure syndrome. It does not involve the gastric mucosa and has no association with gastric malignancy. * Haemolytic Anemia (Option D): This involves the premature destruction of red blood cells. It is associated with complications like gallstones (pigment stones) but not with gastric carcinoma. NEET-PG High-Yield Pearls: * Type A Gastritis: Autoimmune, involves Antibodies (Anti-parietal/Anti-IF), affects the Anatomical fundus, and leads to Achlorhydria [1]. * Type B Gastritis: Caused by Bacteria (H. pylori), affects the Basilar part (Antrum), and is the most common cause of gastric cancer worldwide [2]. * Screening: Patients with pernicious anemia do not require routine endoscopic screening unless they develop new gastrointestinal symptoms.

Q: What are the causes of conjugated hyperbilirubinemia?

Rotor syndrome. Hyperbilirubinemia is classified into unconjugated (indirect) and conjugated (direct) based on whether the bilirubin has undergone glucuronidation in the liver [1]. **Correct Answer: A. Rotor syndrome** Rotor syndrome is an autosomal recessive condition characterized by a defect in the hepatic storage and excretion of bilirubin [2]. Specifically, there is a deficiency in the organic anion transporting polypeptides (**OATP1B1 and OATP1B3**), which are responsible for the re-uptake of conjugated bilirubin into hepatocytes. This leads to an accumulation of **conjugated bilirubin** in the blood. It is clinically benign and presents with mild jaundice. **Explanation of Incorrect Options:** * **B. Breast milk jaundice:** This occurs in neonates due to substances in breast milk (like beta-glucuronidase) that inhibit conjugation or increase enterohepatic circulation, leading to **unconjugated hyperbilirubinemia**. * **C. Crigler-Najjar syndrome:** This is caused by a total (Type I) or partial (Type II) deficiency of the enzyme **UGT1A1**, which is essential for conjugating bilirubin [1]. Therefore, it causes severe **unconjugated hyperbilirubinemia**. * **D. Gilbert syndrome:** The most common hereditary hyperbilirubinemia, caused by reduced activity of **UGT1A1** [2]. It results in mild, intermittent **unconjugated hyperbilirubinemia**, often triggered by stress, fasting, or illness. **High-Yield NEET-PG Pearls:** * **Dubin-Johnson vs. Rotor:** Both cause conjugated hyperbilirubinemia [2]. However, Dubin-Johnson presents with a **black liver** (due to melanin-like pigment) and normal urinary coproporphyrin levels (but 80% is Coproporphyrin I). Rotor syndrome has a **normal-colored liver** and high total urinary coproporphyrin levels. * **Rule of Thumb:** If the defect is in *conjugation* (UGT1A1), it is unconjugated. If the defect is in *excretion/transport* (MRP2, OATP), it is conjugated [1].

Q: A serum-ascitic albumin gradient less than 1.1 g/dL can be due to all the following except?

Nephrotic syndrome. The **Serum-Ascites Albumin Gradient (SAAG)** is the most reliable tool for classifying ascites, replacing the older "transudate vs. exudate" terminology [1]. It is calculated as: *SAAG = (Serum Albumin) – (Ascitic Fluid Albumin)* ### **1. Why Nephrotic Syndrome is the Correct Answer** A **SAAG < 1.1 g/dL** indicates **Non-Portal Hypertension**. In Nephrotic Syndrome, there is a profound loss of albumin in the urine, leading to severe hypoalbuminemia. Because the serum albumin levels are extremely low, the gradient between the serum and the ascitic fluid remains narrow (< 1.1 g/dL). Other causes of low SAAG include peritoneal carcinomatosis, tuberculosis, and pancreatitis [1]. ### **2. Why the Other Options are Incorrect** A **SAAG ≥ 1.1 g/dL** indicates **Portal Hypertension**. This occurs because high hydrostatic pressure in the portal system "pushes" water into the peritoneal cavity while leaving albumin behind in the vessels. * **Cirrhosis (Option A):** The classic cause of sinusoidal portal hypertension (High SAAG) [1]. * **Budd-Chiari Syndrome (Option B):** Post-sinusoidal obstruction leads to high portal pressures (High SAAG). * **Congestive Cardiac Failure (Option C):** Increased systemic venous pressure is transmitted to the portal system (High SAAG) [1]. *Note: CCF typically has a high SAAG but also a high total protein (>2.5 g/dL) in the ascitic fluid.* ### **High-Yield Clinical Pearls for NEET-PG** * **SAAG ≥ 1.1:** Portal Hypertension (Cirrhosis, Alcoholic hepatitis, Cardiac failure, Budd-Chiari, Portal vein thrombosis) [1]. * **SAAG 2.5 g/dL** because the liver sinusoids are healthy and allow protein leakage [1].

Q: On endoscopy, serpiginous ulcers are seen in the distal esophagus with otherwise normal mucosa. What is the most likely diagnosis?

Cytomegalovirus (CMV) esophagitis. The correct answer is **Cytomegalovirus (CMV) esophagitis**. **1. Why CMV Esophagitis is Correct:** CMV esophagitis is a common opportunistic infection in immunocompromised patients (e.g., HIV/AIDS, transplant recipients) [1]. On endoscopy, it characteristically presents as **large, shallow, linear, or serpiginous (snake-like) ulcers**, typically located in the **distal esophagus**. The surrounding mucosa is usually normal. Histopathology typically reveals **intranuclear and intracytoplasmic inclusion bodies** (classic "Owl’s eye" appearance) in endothelial or stromal cells. **2. Why the Other Options are Incorrect:** * **Herpes Simplex Esophagitis (HSV):** Presents as small, multiple, **punched-out "volcano" ulcers**. Unlike CMV, HSV affects the squamous epithelium, showing multinucleated giant cells and Cowdry Type A inclusion bodies on biopsy. * **Candidal Esophagitis:** The most common infectious esophagitis [1]. It presents as **adherent white plaques** (pseudomembranes) that leave a friable, erythematous base when scraped, rather than deep serpiginous ulcers. * **Pill-induced Esophagitis:** Usually presents as sudden-onset odynophagia with **discrete, "kissing" ulcers** at sites of anatomical narrowing (e.g., mid-esophagus near the aortic arch), rather than the distal serpiginous pattern seen in CMV. **Clinical Pearls for NEET-PG:** * **CMV:** Large, shallow, linear/serpiginous ulcers; biopsy the **base** of the ulcer. * **HSV:** Small, deep, punched-out ulcers; biopsy the **edge/margin** of the ulcer. * **Drug of Choice:** Ganciclovir for CMV; Acyclovir for HSV; Fluconazole for Candida. * **HIV Correlation:** CMV esophagitis is usually seen when CD4 counts drop below **50 cells/mm³**.

Question 1

A 17-year-old female, 6 weeks postpartum, presents with increased jaundice, abdominal pain, nausea, vomiting, and fever. Examination reveals jaundice, right upper quadrant pain with guarding, and a clear chest. Chest radiographs are normal. Which of the following tests is most likely to reveal the cause of this pain?

Accepted Answer

Ultrasound of the right upper quadrant

Answer

Serum chemistries

Answer

Complete blood count (CBC) with platelets and differential

Answer

Upper GI series

Question 2

Fistula formation is most common in which of the following conditions?

Accepted Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Infective enterocolitis

Answer

Celiac sprue

Question 3

Which of the following is NOT a complication of cirrhosis?

Accepted Answer

Haemophilia

Answer

Coagulopathy

Answer

Splenomegaly

Answer

Osteoporosis

Question 4

Which of the following diseases causes achalasia?

Accepted Answer

Chaga's disease

Answer

Kala azar

Answer

KFD

Answer

Schistosomiasis

Question 5

Which of the following anemias is a risk factor for the development of gastric carcinoma?

Accepted Answer

Pernicious anaemia

Answer

Megaloblastic anaemia

Answer

Aplastic anaemia

Answer

Haemolytic anaemia

Question 6

What are the causes of conjugated hyperbilirubinemia?

Accepted Answer

Rotor syndrome

Answer

Breast milk jaundice

Answer

Crigler-Najjar syndrome

Answer

Gilbert syndrome

Question 7

Which of the following statements regarding primary sclerosing cholangitis is true?

Accepted Answer

Associated with inflammatory bowel disease

Answer

More common in males

Answer

Involves both intrahepatic and extrahepatic ducts

Answer

ERCP is a diagnostic tool

Question 8

A serum-ascitic albumin gradient less than 1.1 g/dL can be due to all the following except?

Accepted Answer

Nephrotic syndrome

Answer

Cirrhosis

Answer

Budd-Chiari syndrome

Answer

Congestive cardiac failure

Question 9

A 27-year-old man develops malaise, fatigue, and loss of appetite three weeks after a meal. He notes passing dark urine. On physical examination, he has mild scleral icterus and right upper quadrant tenderness. Laboratory studies show serum AST of 62 U/L and ALT of 58 U/L. The total bilirubin concentration is 3.9 mg/dL, and the direct bilirubin concentration is 2.8 mg/dL. His symptoms abate over the next 3 weeks. The cause of his illness is most likely related to contaminated food. Which of the following serologic test results is most likely to be positive in this patient?

Accepted Answer

Anti-HAV

Answer

Anti-HBc

Answer

Anti-HBs

Answer

Anti-HCV

Question 10

On endoscopy, serpiginous ulcers are seen in the distal esophagus with otherwise normal mucosa. What is the most likely diagnosis?

Accepted Answer

Cytomegalovirus (CMV) esophagitis

Answer

Herpes simplex esophagitis

Answer

Candidal esophagitis

Answer

Pill-induced esophagitis

Gastroenterology — MCQs

Gastroenterology — MCQs

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