Gastroenterology — MCQs
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A 56-year-old woman with a history of chronic viral hepatitis B and cirrhosis presents with light-headedness upon standing and dark black stools for 3 days. On examination, her blood pressure is 90/60 mm Hg supine and 76/60 mm Hg standing. Abdominal examination reveals distension with ascites, and multiple bruises are noted on her legs. Her laboratory findings include hemoglobin 9.0 g/dL, platelets 90,000/mL, albumin 3 g/dL, bilirubin 1.3 mg/dL, and an international normalized ratio (INR) of 2.5 (prothrombin time 25 seconds). Which of the following coagulation factors are most likely deficient in this patient?
During a routine pre-employment physical examination, an apparently healthy 24-year-old man is found to have increased serum levels of unconjugated bilirubin. Conjugated bilirubin and transaminases are normal. Careful questioning reveals no evidence of recent illnesses. Which of the following is the most likely diagnosis?
What is the most common cause of lung abscess?
In which of the following conditions is spastic ileus seen?
A 50-year-old man presented with one episode of hematemesis. On vital examination, HR was 110/min with BP of 110/80 mmHg. Systemic examination shows an enlarged spleen with dilated tortuous veins around the umbilicus. What is the first differential diagnosis?
A 50-year-old chronic alcoholic and smoker presents with intermittent episodes of epigastric pain, nausea, and vomiting, along with features of malabsorption for the past 6 months. The patient has lost 12 kg over the last year and was hospitalized for acute abdominal pain 3 years ago. Serum amylase and lipase levels are only mildly elevated. A CT scan of the abdomen and MRCP were performed. What is the most likely diagnosis?
Heyde's syndrome is characterized by which of the following triad?
A 32-year-old Caucasian woman with a 12 pack-year history of smoking presents with diarrhea and right lower quadrant colicky pain. Physical examination reveals tender, red nodules on her legs. Radiological examination shows a specific presentation. What is the most likely diagnosis?
Primary sclerosing cholangitis is associated with which of the following conditions?
The presence of anti-Saccharomyces cerevisiae antibody is a surrogate marker of which of the following conditions?
Gastroenterology Indian Medical PG Practice Questions and MCQs
Question 271: A 56-year-old woman with a history of chronic viral hepatitis B and cirrhosis presents with light-headedness upon standing and dark black stools for 3 days. On examination, her blood pressure is 90/60 mm Hg supine and 76/60 mm Hg standing. Abdominal examination reveals distension with ascites, and multiple bruises are noted on her legs. Her laboratory findings include hemoglobin 9.0 g/dL, platelets 90,000/mL, albumin 3 g/dL, bilirubin 1.3 mg/dL, and an international normalized ratio (INR) of 2.5 (prothrombin time 25 seconds). Which of the following coagulation factors are most likely deficient in this patient?
- A. V and VIII
- B. VIII, IX, XI, and XII
- C. XIII
- D. II, V, VII, IX, X, and XI (Correct Answer)
Explanation: The patient presents with decompensated cirrhosis (ascites, jaundice, coagulopathy) and an upper GI bleed (melena, orthostatic hypotension). In liver cirrhosis, the primary cause of coagulopathy is the **impaired synthesis of clotting factors** by the liver [1]. **Why Option D is Correct:** The liver is responsible for synthesizing almost all coagulation factors except for Factor VIII and von Willebrand factor. * **Vitamin K-dependent factors:** II, VII, IX, and X. * **Non-Vitamin K-dependent factors:** V, XI, XII, and XIII. In this patient, the elevated INR (2.5) and prolonged PT reflect a deficiency in these liver-derived factors [2]. Specifically, **Factor VII** has the shortest half-life and is usually the first to decline, making PT/INR a sensitive marker of acute and chronic liver synthetic function [2]. **Analysis of Incorrect Options:** * **Option A:** Factor V is synthesized by the liver, but **Factor VIII** is primarily produced by endothelial cells (sinusoids) and extrahepatic sites. In liver disease, Factor VIII levels are typically **normal or even elevated** due to increased production and decreased clearance. * **Option B:** While IX, XI, and XII are liver-derived, this list excludes the Vitamin K-dependent factors (II, VII, X) and Factor V, which are also deficient. * **Option C:** Factor XIII is indeed synthesized by the liver, but it is not the only factor deficient; its deficiency alone would not explain the prolonged PT/INR. **Clinical Pearls for NEET-PG:** 1. **Factor VIII:** The "Exception Rule"—it is the only clotting factor not synthesized by hepatocytes; levels remain normal or high in liver failure. 2. **Factor V:** Useful to differentiate between Vitamin K deficiency and liver disease. Factor V is **low** in liver disease but **normal** in isolated Vitamin K deficiency (as it is not Vitamin K-dependent). 3. **Child-Pugh Score:** Uses Albumin, Bilirubin, INR, Ascites, and Encephalopathy to grade cirrhosis severity [2].
Question 272: During a routine pre-employment physical examination, an apparently healthy 24-year-old man is found to have increased serum levels of unconjugated bilirubin. Conjugated bilirubin and transaminases are normal. Careful questioning reveals no evidence of recent illnesses. Which of the following is the most likely diagnosis?
- A. Crigler-Najjar syndrome
- B. Dubin-Johnson syndrome
- C. Gilbert syndrome (Correct Answer)
- D. Rotor syndrome
Explanation: ### Explanation **Gilbert Syndrome** is the most likely diagnosis in this scenario [1]. It is a common, benign autosomal recessive condition characterized by a **reduced activity of the enzyme bilirubin uridine diphosphate-glucuronosyltransferase (UGT1A1)** [1]. This leads to intermittent episodes of mild **unconjugated hyperbilirubinemia**, typically triggered by stress, fasting, illness, or strenuous exercise. **Why it is the correct answer:** The patient is an asymptomatic young adult with isolated unconjugated hyperbilirubinemia and normal liver enzymes (ALT/AST). This "incidental finding" during routine screening is the classic presentation of Gilbert syndrome. Bilirubin levels rarely exceed 4 mg/dL, and the liver architecture remains normal. **Analysis of Incorrect Options:** * **Crigler-Najjar Syndrome:** Type I involves a total absence of UGT1A1 activity, leading to severe, life-threatening jaundice in infancy [1]. Type II (Arias syndrome) involves a severe deficiency (<10% activity) but is still more symptomatic and presents with higher bilirubin levels than Gilbert syndrome. * **Dubin-Johnson Syndrome:** This is a defect in the MRP2 transporter, resulting in **conjugated** hyperbilirubinemia. A key feature is a "black liver" due to pigment deposition. * **Rotor Syndrome:** Similar to Dubin-Johnson, this presents with **conjugated** hyperbilirubinemia due to impaired hepatic storage/uptake of bilirubin, but without the black liver pigmentation. **NEET-PG High-Yield Pearls:** * **Enzyme involved:** UGT1A1 (reduced to ~30% of normal) [1]. * **Trigger factors:** Fasting (the "Fasting Test" was historically used for diagnosis), dehydration, menstruation, and surgery. * **Treatment:** No treatment is required; the prognosis is excellent [1]. * **Differential Diagnosis:** Always rule out hemolysis; however, in Gilbert syndrome, hemoglobin and reticulocyte counts are normal [2].
Question 273: What is the most common cause of lung abscess?
- A. Staphylococcus aureus
- B. Oral anaerobes (Correct Answer)
- C. Klebsiella
- D. Tuberculosis
Explanation: **Explanation:** The most common cause of lung abscess is the **aspiration of oropharyngeal secretions** [1] containing **oral anaerobes** (e.g., *Peptostreptococcus*, *Fusobacterium*, and *Prevotella*). This typically occurs in patients with predispositions such as poor dentition (gingivitis), altered consciousness (alcoholism, seizures), or swallowing dysfunction [1, 2]. The aspirated material settles in dependent segments of the lung, leading to necrotizing pneumonia and subsequent abscess formation. **Analysis of Options:** * **A. Staphylococcus aureus:** While a common cause of necrotizing pneumonia and multiple small abscesses (especially post-influenza or via hematogenous spread), it is less frequent than anaerobic aspiration in the general population [3]. * **C. Klebsiella:** A classic cause of "Friedlander’s pneumonia" characterized by "currant jelly sputum" and tissue necrosis. It is common in chronic alcoholics but remains less frequent than mixed anaerobic infections [2]. * **D. Tuberculosis:** *Mycobacterium tuberculosis* typically causes "cavitation" rather than a pyogenic abscess. While a major differential in India, it is classified separately from primary lung abscesses [2]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common site:** The **posterior segment of the right upper lobe** and the **superior segment of the right lower lobe** (due to the vertical nature of the right main bronchus). 2. **Clinical Clue:** Foul-smelling (putrid) sputum is highly suggestive of anaerobic infection. 3. **Treatment of Choice:** **Clindamycin** [4] or Beta-lactam/Beta-lactamase inhibitor combinations (e.g., Piperacillin-Tazobactam). 4. **Air-fluid level:** The classic radiological finding on a chest X-ray.
Question 274: In which of the following conditions is spastic ileus seen?
- A. Porphyria (Correct Answer)
- B. Retroperitoneal abscess
- C. Hypokalemia
- D. Myocardial Infarction (MI)
Explanation: **Explanation:** **Spastic ileus** is a rare form of intestinal obstruction caused by sustained, uncoordinated contraction of the intestinal smooth muscle, which prevents the normal transit of contents. **1. Why Porphyria is correct:** In **Acute Intermittent Porphyria (AIP)**, the accumulation of porphyrin precursors (PBG and ALA) leads to autonomic neuropathy [1]. This causes an imbalance in the enteric nervous system, resulting in segmental hyper-contraction or "spasms" of the bowel wall. This spasticity leads to severe abdominal pain and functional obstruction (spastic ileus), which is a classic presentation of a porphyric crisis [1]. **2. Why the other options are incorrect:** * **Retroperitoneal abscess:** This typically causes **adynamic (paralytic) ileus**. The inflammatory process near the retroperitoneum triggers a neural reflex that inhibits bowel motility. * **Hypokalemia:** Low potassium levels hyperpolarize the smooth muscle cells of the gut, making them less excitable. This leads to decreased peristalsis and **paralytic ileus**. * **Myocardial Infarction (MI):** An acute MI (especially inferior wall) can cause **paralytic ileus** due to a systemic stress response and sympathetic overactivity, which inhibits intestinal motility. **High-Yield Clinical Pearls for NEET-PG:** * **Paralytic Ileus (Adynamic):** Most common type. Causes include post-operative state, electrolyte imbalances (Hypokalemia, Hypomagnesemia), and drugs (Opioids, Anticholinergics). * **Spastic Ileus:** Rare. Key causes include **Porphyria** [1], **Lead poisoning** [2], and **Uremia**. * **Ogilvie Syndrome:** Acute pseudo-obstruction of the colon (massive dilation) without mechanical cause, often seen in elderly or critically ill patients. * **Classic Triad of AIP:** Abdominal pain, Neuropsychiatric symptoms, and Peripheral neuropathy (often triggered by drugs like Barbiturates or Sulfonamides) [1].
Question 275: A 50-year-old man presented with one episode of hematemesis. On vital examination, HR was 110/min with BP of 110/80 mmHg. Systemic examination shows an enlarged spleen with dilated tortuous veins around the umbilicus. What is the first differential diagnosis?
- A. Kala Azar
- B. Non-cirrhotic portal fibrosis (Correct Answer)
- C. Fatty liver
- D. Non-alcoholic fatty liver disease
Explanation: The clinical presentation describes a classic case of **Portal Hypertension** (splenomegaly and caput medusae) presenting with an acute upper GI bleed (hematemesis) [1]. **1. Why Non-cirrhotic portal fibrosis (NCPF) is correct:** NCPF is a common cause of portal hypertension in the Indian subcontinent. It is characterized by **obliterative portovenopathy** leading to pre-sinusoidal portal hypertension [2]. Key features include: * **Massive Splenomegaly:** Often the most prominent finding. * **Preserved Liver Function:** Unlike cirrhosis, these patients usually have normal liver enzymes and synthetic function (no jaundice or ascites initially), but they present early with **variceal bleeding** due to high portal pressures [2]. * **Clinical Signs:** Caput medusae (dilated umbilical veins) confirms significant porto-systemic shunting [1]. **2. Why other options are incorrect:** * **Kala Azar:** While it causes massive splenomegaly, it does not typically cause portal hypertension or caput medusae. Patients usually present with prolonged fever, weight loss, and pancytopenia. * **Fatty Liver / NAFLD:** These conditions represent a spectrum of liver disease. While they can progress to cirrhosis (which causes portal hypertension), "Fatty liver" itself is usually asymptomatic and does not present with hematemesis or splenomegaly unless advanced fibrosis has occurred. NCPF is a more specific diagnosis for the "isolated" portal hypertension picture described. **Clinical Pearls for NEET-PG:** * **NCPF vs. EHPVO:** Both cause pre-sinusoidal portal hypertension. However, Extrahepatic Portal Venous Obstruction (EHPVO) usually presents in children/younger patients with a portal cavernoma on ultrasound. * **Schistosomiasis:** The most common cause of non-cirrhotic portal hypertension globally (pre-sinusoidal). * **Management:** The treatment of choice for acute variceal bleed in NCPF is Endoscopic Variceal Ligation (EVL). These patients have a better prognosis than cirrhotics due to preserved liver function [2].
Question 276: A 50-year-old chronic alcoholic and smoker presents with intermittent episodes of epigastric pain, nausea, and vomiting, along with features of malabsorption for the past 6 months. The patient has lost 12 kg over the last year and was hospitalized for acute abdominal pain 3 years ago. Serum amylase and lipase levels are only mildly elevated. A CT scan of the abdomen and MRCP were performed. What is the most likely diagnosis?
- A. Acute pancreatitis
- B. Chronic pancreatitis (Correct Answer)
- C. Pancreatic cancer
- D. Pancreatic pseudocyst
Explanation: The clinical presentation is classic for **Chronic Pancreatitis (CP)**. The diagnosis is based on the triad of chronic abdominal pain, features of exocrine insufficiency (malabsorption/weight loss), and a history of predisposing factors (alcoholism and smoking). [1] **1. Why Chronic Pancreatitis is Correct:** * **Clinical History:** Chronic alcohol consumption is the most common cause of CP. [1] The patient’s history of a prior acute episode 3 years ago suggests a progression from acute to chronic inflammation. * **Exocrine Insufficiency:** Significant weight loss (12 kg) and malabsorption (steatorrhea) indicate that >90% of the pancreatic parenchyma is damaged, a hallmark of late-stage CP. [3] * **Enzymes:** In CP, serum amylase and lipase are often **normal or only mildly elevated** because the pancreatic acinar cells are fibrotic and exhausted, unlike the massive release seen in acute episodes. **2. Why Other Options are Incorrect:** * **Acute Pancreatitis:** Typically presents with acute, severe, constant pain radiating to the back and significantly elevated amylase/lipase (>3x normal). It does not explain chronic malabsorption or long-term weight loss. * **Pancreatic Cancer:** While it presents with weight loss and pain, the 3-year history of abdominal pain and the specific link to chronic alcoholism favor CP. However, CP is a major risk factor for adenocarcinoma. * **Pancreatic Pseudocyst:** This is a complication of pancreatitis. While it causes pain and a palpable mass, it wouldn't typically cause generalized malabsorption unless it causes significant ductal obstruction. **3. NEET-PG High-Yield Pearls:** * **Most common cause:** Alcohol (Adults), Cystic Fibrosis (Children). [1] * **Imaging Gold Standard:** **MRCP** is the non-invasive test of choice to visualize ductal changes ("Chain of Lakes" appearance). [2] * **Most sensitive test for early CP:** Endoscopic Ultrasound (EUS). * **Classic Triad (rarely all present):** Pancreatic calcifications, steatorrhea, and diabetes mellitus. * **Treatment of Malabsorption:** Pancreatic enzyme replacement therapy (PERT) taken *with* meals.
Question 277: Heyde's syndrome is characterized by which of the following triad?
- A. Mitral stenosis, arthritis, and biliary cirrhosis
- B. Mitral regurgitation, hiatus hernia, and cirrhosis
- C. Aortic stenosis, gastrointestinal bleeding, and angiodysplasia of the colon (Correct Answer)
- D. Pulmonary arterial hypertension, tricuspid regurgitation, and cirrhosis
Explanation: **Explanation:** **Heyde’s Syndrome** is a multisystem clinical triad consisting of **Aortic Stenosis (AS)**, **Gastrointestinal bleeding**, and **Colonic Angiodysplasia**. The underlying pathophysiology is rooted in an **acquired Type 2A Von Willebrand Syndrome**. When blood passes through a narrowed, calcified aortic valve [1], the high shear stress causes the large multimeric forms of Von Willebrand Factor (vWF) to unfold. This makes them susceptible to cleavage by the enzyme ADAMTS13. The resulting deficiency of high-molecular-weight vWF multimers impairs platelet adhesion, leading to bleeding from pre-existing colonic angiodysplasias (vascular malformations). Notably, valve replacement often resolves the coagulopathy and stops the GI bleeding. **Analysis of Incorrect Options:** * **Option A & B:** Mitral valve pathologies (Stenosis/Regurgitation) do not generate the specific high shear stress required to cleave vWF multimers in this context. * **Option D:** This describes features more consistent with right-sided heart failure or "Cardiac Cirrhosis," but it does not constitute a recognized syndrome involving angiodysplastic bleeding. **High-Yield Clinical Pearls for NEET-PG:** * **Pathophysiology:** Acquired Von Willebrand Disease (Type 2A) due to mechanical destruction of vWF multimers. * **Diagnosis:** Echocardiography for AS and Colonoscopy/Angiography for angiodysplasia. * **Definitive Treatment:** Aortic Valve Replacement (AVR) is the treatment of choice, as it corrects the hematologic abnormality [1]. * **Association:** It is a classic example of the "heart-gut" connection in clinical medicine.
Question 278: A 32-year-old Caucasian woman with a 12 pack-year history of smoking presents with diarrhea and right lower quadrant colicky pain. Physical examination reveals tender, red nodules on her legs. Radiological examination shows a specific presentation. What is the most likely diagnosis?
- A. Ulcerative colitis
- B. Crohn's disease (Correct Answer)
- C. Ulcerative tuberculosis
- D. Hirschsprung's disease
Explanation: ***Crohn's disease*** - **Right lower quadrant pain** and **diarrhea** in a young smoker strongly suggests **terminal ileum** involvement, which is characteristic of Crohn's disease. - The **tender red nodules** on legs represent **erythema nodosum**, a common extraintestinal manifestation of Crohn's disease, and **smoking** is a significant risk factor. *Ulcerative colitis* - Typically presents with **bloody diarrhea** and **left lower quadrant pain** due to **rectosigmoid** involvement, not right-sided symptoms. - **Smoking is protective** against ulcerative colitis, unlike in this patient who is a smoker. *Ulcerative tuberculosis* - Usually affects the **ileocecal region** but presents with **systemic symptoms** like **fever**, **night sweats**, and **weight loss**. - More common in **endemic areas** and **immunocompromised patients**, not typically associated with erythema nodosum. *Hirschsprung's disease* - A **congenital condition** presenting in **infancy** with **chronic constipation** and **abdominal distension**. - Caused by **absence of ganglion cells** in the colon, not associated with inflammatory symptoms or erythema nodosum.
Question 279: Primary sclerosing cholangitis is associated with which of the following conditions?
- A. Ulcerative colitis
- B. Retroperitoneal fibrosis
- C. Reidel's thyroiditis
- D. All of the above (Correct Answer)
Explanation: **Explanation:** Primary Sclerosing Cholangitis (PSC) is a chronic cholestatic liver disease characterized by inflammation and obliterative fibrosis of both intrahepatic and extrahepatic bile ducts, leading to a "beaded" appearance on imaging. **1. Why "All of the above" is correct:** PSC is strongly linked to several systemic inflammatory and fibrotic conditions. * **Ulcerative Colitis (UC):** This is the most well-known association. Approximately 70-80% of patients with PSC have co-existing Inflammatory Bowel Disease (IBD), most commonly UC [1], [2]. Conversely, about 4-5% of UC patients develop PSC. * **IgG4-Related Disease (IgG4-RD):** Modern medical literature classifies several fibro-inflammatory conditions under the umbrella of IgG4-RD. PSC (specifically the IgG4-associated variant), **Retroperitoneal Fibrosis**, and **Riedel’s Thyroiditis** are all part of this spectrum of systemic fibrosing syndromes. They share similar histopathological features, including storiform fibrosis and lymphocytic infiltration. **2. Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** MRCP (Magnetic Resonance Cholangiopancreatography) is the initial diagnostic test of choice, showing the classic "string of beads" appearance. * **Antibody Marker:** **p-ANCA** (Perinuclear Anti-Neutrophil Cytoplasmic Antibody) is positive in about 60-80% of cases, though it is not specific [1], [2]. * **Malignancy Risk:** PSC is a major risk factor for **Cholangiocarcinoma** (10-15% lifetime risk) and Gallbladder cancer. * **Treatment:** Liver transplantation is the only definitive treatment for end-stage disease. Ursodeoxycholic acid (UDCA) may improve biochemical markers but does not improve survival. * **Gender Predilection:** Unlike Primary Biliary Cholangitis (PBC), which is more common in females, PSC is more common in **males** (2:1 ratio) [2].
Question 280: The presence of anti-Saccharomyces cerevisiae antibody is a surrogate marker of which of the following conditions?
- A. Celiac disease
- B. Crohn's disease (Correct Answer)
- C. Ulcerative colitis
- D. Tropical sprue
Explanation: 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).
Practice by Chapter
Esophageal Disorders
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Peptic Ulcer Disease
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Inflammatory Bowel Disease
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Irritable Bowel Syndrome
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Malabsorption Syndromes
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Pancreatitis (Acute and Chronic)
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Gastrointestinal Bleeding
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Liver Diseases and Cirrhosis
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Viral Hepatitis
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Biliary Tract Disorders
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Gastrointestinal Motility Disorders
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Gastrointestinal Malignancies
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