Gastroenterology — MCQs

A 59-year-old man complains of progressive weakness and reports very dark stools. Physical examination demonstrates fullness in the right lower quadrant. Laboratory studies show iron deficiency anemia (serum hemoglobin 7.4 g/dL), and stool specimens are positive for occult blood. Colonoscopy discloses an ulcerating lesion of the cecum. Which of the following serum tumor markers is most likely to be useful for following this patient after surgery?

Q449Medium

A 9-month-old pregnant lady presents with jaundice, abdominal distension, and pedal edema after delivering a normal baby. Her clinical condition deteriorates with increasing abdominal distension and severe ascites. Her bilirubin is 5 mg/dL, S. alkaline phosphatase is 450 U/L, and ALT is 345 U/L. There is tender hepatomegaly 6 cm below the costal margin, and the ascitic fluid shows protein less than 2 mg%. What is the most likely diagnosis?

Q450Medium

A 47-year-old man presents to the emergency room with sudden onset of severe upper abdominal pain with vomiting. The pain is focused in the epigastrium with radiation to the back. Serum amylase levels are 2000 U/L. Which of the following are the most commonly encountered predisposing factors for this condition?

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 441: Which of the following is NOT true regarding Zollinger Ellison syndrome?

A. Diarrhoea
B. Recurrence after operation
C. Hypergastrinemia
D. Decreased ratio of basal acid output to maximal acid output (Correct Answer)

Explanation: **Explanation:** Zollinger-Ellison Syndrome (ZES) is caused by a gastrin-secreting tumor (gastrinoma), typically located in the "gastrinoma triangle." This leads to massive gastric acid hypersecretion. **1. Why Option D is the Correct Answer (The False Statement):** In ZES, the **Basal Acid Output (BAO)** is significantly elevated because the tumor continuously secretes gastrin. While the **Maximal Acid Output (MAO)** (stimulated by pentagastrin) is also high, the stomach is already secreting near its maximum capacity at baseline. Therefore, the **BAO/MAO ratio is increased** (typically >0.6 or 60%). A decreased ratio would imply low baseline acid production, which is the opposite of ZES pathophysiology. **2. Why the other options are wrong (True Statements):** * **A. Diarrhea:** This is a common symptom (seen in ~50% of patients). It occurs because the massive acid load inactivates pancreatic enzymes (lipase) and damages the intestinal mucosa, leading to malabsorption and steatorrhea. * **B. Recurrence after operation:** ZES has a high rate of recurrence, especially in patients with MEN-1 syndrome, where tumors are often small, multiple, and difficult to localize. * **C. Hypergastrinemia:** This is the hallmark of ZES. Fasting serum gastrin levels are typically >1000 pg/mL. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The best initial test is Fasting Serum Gastrin. The most sensitive/confirmatory test is the **Secretin Stimulation Test** (Secretin causes a paradoxical *increase* in gastrin in ZES). * **Location:** Most common site is the **Duodenum**, followed by the Pancreas. * **Association:** 25% of cases are associated with **MEN-1** (3Ps: Parathyroid, Pancreas, Pituitary). * **Ulcer Site:** Look for ulcers in "atypical" locations, such as the distal duodenum or jejunum.

Question 442: Congenital Wilson's disease is characterized by which of the following?

A. Kayser-Fleischer rings are present at birth
B. May present as acute hepatitis (Correct Answer)
C. Decreased urinary copper excretion
D. Decreased hepatic copper concentration

Explanation: **Explanation:** Wilson’s Disease (Hepatolenticular degeneration) is an autosomal recessive disorder caused by a mutation in the **ATP7B gene** on chromosome 13. This leads to impaired biliary copper excretion and failure to incorporate copper into ceruloplasmin, resulting in toxic copper accumulation in the liver, brain, and cornea. **Why Option B is correct:** Wilson’s disease is a "great masquerader" in hepatology. While it is a chronic condition, it frequently presents as **acute hepatitis**, which can progress to fulminant hepatic failure (often characterized by Coombs-negative hemolytic anemia and low alkaline phosphatase levels) [1]. Hepatic symptoms typically manifest in childhood or adolescence (ages 5–15), whereas neuropsychiatric symptoms appear later [1]. **Why other options are incorrect:** * **Option A:** Kayser-Fleischer (KF) rings are caused by copper deposition in the **Descemet’s membrane** of the cornea. They are **never present at birth** [1]; they develop over time as copper stores saturate the liver and spill into the systemic circulation. * **Option C:** In Wilson’s disease, there is **increased 24-hour urinary copper excretion** (>100 μg/day) because non-ceruloplasmin-bound copper is filtered by the kidneys. * **Option D:** The hallmark of the disease is **increased hepatic copper concentration** (>250 μg/g dry weight), as the liver is the primary site of accumulation. **NEET-PG High-Yield Pearls:** * **Best Initial Screening Test:** Serum Ceruloplasmin (decreased <20 mg/dL). * **Gold Standard Diagnosis:** Liver biopsy for copper quantification. * **Most Sensitive Finding for Neuro-Wilson’s:** "Face of the Giant Panda" sign on MRI Brain [1]. * **Treatment of Choice:** Chelating agents like **D-Penicillamine** (requires Pyridoxine supplementation) or Trientine. Zinc is used for maintenance or asymptomatic patients.

Question 443: Which of the following is the most common presenting symptom of non-cirrhotic portal hypertension?

A. Chronic liver disease
B. Ascites
C. Upper gastrointestinal bleeding (Correct Answer)
D. Encephalopathy

Explanation: **Explanation:** **Non-Cirrhotic Portal Hypertension (NCPH)** refers to a group of disorders characterized by an increase in portal pressure (HVPG > 5 mmHg) in the absence of cirrhosis [1]. The two most common types are **Extrahepatic Portal Venous Obstruction (EHPVO)** and **Non-Cirrhotic Portal Fibrosis (NCPF)**. **Why Upper Gastrointestinal (UGI) Bleeding is correct:** In NCPH, the liver's synthetic function remains preserved, but the portal pressure is significantly elevated. This leads to the formation of large, high-pressure esophageal and gastric varices [2]. Because these patients do not have the systemic decompensation seen in cirrhosis, they typically remain asymptomatic until a varix ruptures. Therefore, **painless, massive hematemesis (UGI bleeding)** is the most common and often the first presenting symptom [2]. **Why other options are incorrect:** * **Chronic Liver Disease (CLD):** By definition, NCPH occurs in the absence of cirrhosis. Stigmata of CLD (like palmar erythema or spider nevi) are typically absent. * **Ascites:** Since serum albumin and liver function are preserved, ascites is rare [3]. If present, it is usually transient and follows an episode of UGI bleed or infection. * **Encephalopathy:** Hepatic encephalopathy is extremely rare in NCPH because the liver's metabolic and detoxification functions are intact. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark of NCPH:** Massive Splenomegaly + Variceal Bleed + Preserved Liver Function. * **EHPVO:** Most common cause of portal hypertension in children; often associated with a history of neonatal umbilical sepsis. * **Investigation of Choice:** Color Doppler Ultrasound (shows "Cavernoma" formation in EHPVO) [3]. * **Prognosis:** Much better than cirrhotic portal hypertension because the liver is healthy.

Question 444: A 23-year-old female presented with symptoms of severe pancreatitis. All of the following are considered bad prognostic signs in this patient, EXCEPT:

A. TLC > 16000
B. Calcium < 8 mg/dL
C. Glucose > 200 mg%
D. Prothrombin time > 2 times the control (Correct Answer)

Explanation: This question tests your knowledge of the **Ranson Criteria**, which is a classic scoring system used to predict the severity and mortality of acute pancreatitis. [1] ### **Explanation of the Correct Answer** **Option D (Prothrombin Time)** is the correct answer because it is **not** a component of the Ranson Criteria. While a prolonged PT indicates coagulopathy or liver dysfunction, it is not used as a specific prognostic marker for acute pancreatitis in the Ranson, APACHE II, or BISAP scoring systems. [2] ### **Analysis of Incorrect Options (Ranson Criteria Components)** The Ranson Criteria assesses the patient at two time points: **At Admission** and **At 48 Hours**. * **Option A (TLC > 16,000/mm³):** This is a marker of severe systemic inflammation and is one of the five criteria assessed **at admission**. * **Option C (Glucose > 200 mg/dL):** Hyperglycemia at admission indicates significant pancreatic endocrine insult and stress response, correlating with a poorer prognosis. * **Option B (Calcium < 8 mg/dL):** Hypocalcemia (due to saponification of fat in the retroperitoneum) is assessed **within 48 hours** of admission. A drop below 8 mg/dL signifies severe necrotizing pancreatitis. ### **High-Yield Clinical Pearls for NEET-PG** To master Ranson Criteria, remember the mnemonics: 1. **At Admission (GAWET):** * **G**lucose > 200 mg/dL * **A**ge > 55 years * **W**BC (TLC) > 16,000/mm³ * **E**AST (AST) > 250 U/L * **L**DH > 350 U/L [1] 2. **At 48 Hours (C HOBBS):** * **C**alcium < 8 mg/dL * **H**ematocrit fall > 10% * **O**xygen (PaO2) < 60 mmHg * **B**UN increase > 5 mg/dL * **B**ase deficit > 4 mEq/L * **S**equestration of fluid > 6L **Note:** For **Gallstone-induced pancreatitis**, the thresholds change (e.g., Age > 70, WBC > 18,000). Currently, **BUN** and **BISAP score** are considered more reliable early predictors in modern clinical practice.

Question 445: The Number Connection Test is performed to detect which condition?

A. Parkinsonism
B. Dementia
C. Cerebellar ataxia
D. Hepatic encephalopathy (Correct Answer)

Explanation: **Explanation:** The **Number Connection Test (NCT)**, also known as the Reitan Trail-making Test, is a psychometric assessment used primarily to detect **Minimal Hepatic Encephalopathy (MHE)** and Grade I Hepatic Encephalopathy. In this test, the patient is asked to connect numbered circles in sequential order (1-2-3...) as quickly as possible. A delay in completion time reflects impaired cognitive function, psychomotor slowing, and poor visuospatial coordination, which are early hallmarks of hepatic encephalopathy. **Analysis of Options:** * **Hepatic Encephalopathy (Correct):** NCT is a highly sensitive bedside tool for diagnosing "latent" or subclinical encephalopathy in patients with cirrhosis who otherwise appear neurologically normal on routine examination. * **Parkinsonism:** Diagnosis is primarily clinical, based on motor symptoms like bradykinesia, tremors, and rigidity. While cognitive tests exist, NCT is not the specific diagnostic standard. * **Dementia:** Screened using the Mini-Mental State Examination (MMSE) or MoCA [2]. These tests focus on memory, orientation, and language rather than just psychomotor speed. * **Cerebellar Ataxia:** Evaluated via coordination tests like the finger-nose test, heel-to-shin test, and gait analysis, rather than a timed numerical connection task [1]. **High-Yield Clinical Pearls for NEET-PG:** * **West Haven Criteria:** The gold standard for grading the severity of Hepatic Encephalopathy (Grades 0-4). * **Asterixis (Flapping Tremors):** Characteristically seen in Grade II encephalopathy. * **Triphasic Waves:** The classic EEG finding in Hepatic Encephalopathy. * **First-line Treatment:** Lactulose (acidifies the gut to convert $NH_3$ to $NH_4^+$) and Rifaximin (non-absorbable antibiotic).

Question 446: Achalasia cardiae presents with all EXCEPT:

A. Increased lower esophageal sphincter tone
B. Normal peristalsis (Correct Answer)
C. Dilatation proximally
D. Malignancy

Explanation: 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 progressive peristalsis** in the distal esophagus [1]. **Why "Normal Peristalsis" is the correct answer:** The hallmark pathophysiology of Achalasia involves the degeneration of the myenteric (Auerbach’s) plexus. This leads to **aperistalsis** (loss of organized motor activity) in the esophageal body [1]. Therefore, finding "normal peristalsis" is incompatible with a diagnosis of Achalasia. **Analysis of other options:** * **A. Increased LES tone:** In Achalasia, there is hypertensive LES (resting pressure >45 mmHg) and, more importantly, incomplete relaxation of the sphincter upon swallowing due to a lack of inhibitory neurotransmitters (NO and VIP) [1]. * **C. Dilatation proximally:** Due to the functional obstruction at the LES, food and liquid accumulate, leading to progressive proximal dilatation of the esophagus (often termed "Megaesophagus" in advanced stages) [1]. * **D. Malignancy:** Long-standing Achalasia is a recognized risk factor for **Squamous Cell Carcinoma** of the esophagus (occurring in ~3-5% of cases) due to chronic irritation from stasis of food and fermentation. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows aperistalsis and incomplete LES relaxation). * **Barium Swallow Sign:** "Bird’s Beak" or "Rat-tail" appearance [1]. * **Triad of Achalasia:** 1. Incomplete LES relaxation, 2. Increased LES tone, 3. Aperistalsis. * **First-line Management:** Pneumatic dilation or Heller’s Myotomy (often with Dor/Toupet fundoplication). * **Pharmacotherapy:** Nitrates or Calcium Channel Blockers (least effective, used in surgical non-candidates).

Question 447: Which of the following is true regarding classical spontaneous bacterial peritonitis?

A. Ascitic fluid neutrophil count is > 250/cumm (Correct Answer)
B. Bowel perforation should be present
C. Multiple organisms are isolated from ascitic fluid
D. Board-like rigidity is present in the abdomen

Explanation: Spontaneous Bacterial Peritonitis (SBP) is an acute bacterial infection of ascitic fluid, occurring in the absence of an identifiable intra-abdominal source of infection (like a perforated viscus). It is a common and serious complication of cirrhosis. **Why Option A is Correct:** The diagnosis of SBP is established by an **absolute neutrophil count (ANC) ≥ 250 cells/mm³** (0.25 x 10⁹/L) in the ascitic fluid. This is the most sensitive indicator of infection. Even if the culture is negative (Culture-Negative Neutrocytic Ascites), a patient with an ANC > 250 should be treated empirically with antibiotics (e.g., Cefotaxime). **Why Other Options are Incorrect:** * **Option B & D:** These are features of **Secondary Peritonitis**. SBP occurs without a surgically treatable source like bowel perforation. Clinical signs of "board-like rigidity" and "rebound tenderness" are typical of surgical peritonitis; SBP often presents subtly with vague abdominal pain or worsening encephalopathy. * **Option C:** SBP is typically **monomicrobial**. The most common organisms are *E. coli*, *Klebsiella*, and *Streptococcus pneumoniae*. Isolation of multiple organisms (polymicrobial) suggests Secondary Peritonitis due to a gut wall breach. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organism:** *Escherichia coli*. * **Treatment of choice:** Third-generation cephalosporins (Cefotaxime). * **Albumin Therapy:** Administering IV albumin (1.5g/kg on day 1 and 1g/kg on day 3) reduces the risk of Hepatorenal Syndrome and mortality [1]. * **Prophylaxis:** Indicated for patients with low ascitic protein (<1.5 g/dL) or a prior episode of SBP (usually with Norfloxacin or Rifaximin) [2].

Question 448: A 59-year-old man complains of progressive weakness and reports very dark stools. Physical examination demonstrates fullness in the right lower quadrant. Laboratory studies show iron deficiency anemia (serum hemoglobin 7.4 g/dL), and stool specimens are positive for occult blood. Colonoscopy discloses an ulcerating lesion of the cecum. Which of the following serum tumor markers is most likely to be useful for following this patient after surgery?

A. Alpha-fetoprotein
B. Carcinoembryonic antigen (Correct Answer)
C. Chorionic gonadotropin
D. Chromogranin

Explanation: **Explanation:** The clinical presentation of a 59-year-old male with iron deficiency anemia (IDA), occult blood in stools, a palpable right lower quadrant mass, and an ulcerating cecal lesion is classic for **Right-sided Colorectal Cancer (CRC)**. In elderly patients, IDA is considered CRC until proven otherwise [1]. **Carcinoembryonic Antigen (CEA)** is the most widely used tumor marker for colorectal carcinoma [3]. It is important to note that CEA is **not** used for screening or primary diagnosis due to low sensitivity and specificity [2]. Its primary clinical utility lies in **monitoring for recurrence** after surgical resection and assessing the response to chemotherapy [2]. A persistent elevation of CEA post-surgery suggests residual disease or metastasis. **Analysis of Incorrect Options:** * **A. Alpha-fetoprotein (AFP):** Used for monitoring Hepatocellular Carcinoma (HCC) and non-seminomatous germ cell tumors (e.g., Yolk sac tumor) [3]. * **C. Chorionic gonadotropin (hCG):** A marker for pregnancy, gestational trophoblastic disease (Hydatidiform mole/Choriocarcinoma), and certain germ cell tumors [3]. * **D. Chromogranin:** A marker for neuroendocrine tumors (e.g., Carcinoid tumors). While carcinoids can occur in the bowel, the presentation of an ulcerating lesion with IDA strongly favors adenocarcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Right-sided CRC:** Presents with occult bleeding, IDA [1], and "cauliflower-like" masses. Obstruction is rare due to the large caliber of the cecum [1]. * **Left-sided CRC:** Presents with "napkin-ring" constrictions, altered bowel habits (pencil-thin stools), and early intestinal obstruction [1]. * **CEA Fact:** Smoking can cause a mild elevation in baseline CEA levels. * **Most common site of metastasis:** Liver (via the portal circulation).

Question 449: A 9-month-old pregnant lady presents with jaundice, abdominal distension, and pedal edema after delivering a normal baby. Her clinical condition deteriorates with increasing abdominal distension and severe ascites. Her bilirubin is 5 mg/dL, S. alkaline phosphatase is 450 U/L, and ALT is 345 U/L. There is tender hepatomegaly 6 cm below the costal margin, and the ascitic fluid shows protein less than 2 mg%. What is the most likely diagnosis?

A. Acute fatty liver of pregnancy
B. HELLP syndrome
C. Acute fulminant liver failure
D. Budd-Chiari syndrome (Correct Answer)

Explanation: ### Explanation **Correct Option: D. Budd-Chiari Syndrome (BCS)** Budd-Chiari syndrome is defined as the obstruction of hepatic venous outflow. Pregnancy and the postpartum period are hypercoagulable states that significantly increase the risk of hepatic vein thrombosis. The clinical triad of **tender hepatomegaly, severe ascites, and jaundice** is classic for BCS [1]. A key diagnostic clue in this question is the ascitic fluid protein. In BCS, the ascitic fluid is typically a **transudate** (protein <2.5 g/dL) because the obstruction is post-sinusoidal, leading to high hydrostatic pressure. The presentation immediately after delivery further supports a thrombotic etiology. **Why Incorrect Options are Wrong:** * **A. Acute Fatty Liver of Pregnancy (AFLP):** Usually presents in the third trimester *before* delivery with hypoglycemia, coagulopathy, and microvesicular steatosis [2]. It typically resolves after delivery rather than deteriorating post-partum with massive ascites. * **B. HELLP Syndrome:** Characterized by **H**emolysis (schistocytes), **E**levated **L**iver enzymes, and **L**ow **P**latelets. While it causes RUQ pain, it does not typically present with massive ascites and tender 6 cm hepatomegaly. * **C. Acute Fulminant Liver Failure:** While bilirubin and ALT are elevated, the specific combination of massive ascites and tender hepatomegaly in a postpartum hypercoagulable state points more specifically to a vascular obstruction (BCS) rather than primary hepatocellular necrosis. **NEET-PG High-Yield Pearls:** * **Most common cause of BCS worldwide:** Idiopathic or Thrombosis (e.g., Factor V Leiden, Pregnancy). In the Orient/India, membranous webs in the IVC are common. * **Diagnostic Investigation of Choice:** Color Doppler Ultrasound (shows "spider-web" collateral vessels). Gold standard is Venography. * **Ascitic Fluid in BCS:** High SAAG (>1.1) and low protein (<2.5 g/dL). * **Caudate Lobe:** Often enlarges in BCS because it has independent venous drainage directly into the IVC.

Question 450: A 47-year-old man presents to the emergency room with sudden onset of severe upper abdominal pain with vomiting. The pain is focused in the epigastrium with radiation to the back. Serum amylase levels are 2000 U/L. Which of the following are the most commonly encountered predisposing factors for this condition?

A. Alcohol use and gallstones (Correct Answer)
B. Helicobacter pylori infection and excess gastric acid secretion
C. Hepatitis B infection and iron overload
D. Obesity and high serum cholesterol

Explanation: The clinical presentation of sudden-onset epigastric pain radiating to the back, associated with vomiting and significantly elevated serum amylase (normal <140 U/L), is diagnostic of **Acute Pancreatitis** [1]. **1. Why Option A is Correct:** In over 80% of cases worldwide, acute pancreatitis is caused by either **gallstones** or **alcohol consumption** [1]. * **Gallstones:** The most common cause overall. They cause obstruction of the ampulla of Vater, leading to bile reflux into the pancreatic duct or increased ductal pressure, triggering premature activation of pancreatic enzymes (trypsinogen to trypsin) within the acinar cells [1]. * **Alcohol:** The second most common cause [1]. It increases the permeability of ductules and increases the protein content of pancreatic secretions, leading to the formation of protein plugs that obstruct small ducts. **2. Why Other Options are Incorrect:** * **Option B:** *H. pylori* and excess acid are the primary drivers of **Peptic Ulcer Disease**. While a perforated ulcer can mimic the pain of pancreatitis, it does not typically cause a massive rise in amylase [1]. * **Option C:** Hepatitis B causes cirrhosis or hepatocellular carcinoma; iron overload leads to Hemochromatosis ("Bronze Diabetes"). Neither is a common trigger for acute pancreatitis. * **Option D:** While obesity is a risk factor for gallstones and severe pancreatitis, it is not a direct trigger. Hypertriglyceridemia (specifically >1000 mg/dL) is a known cause, but high cholesterol alone is not. **Clinical Pearls for NEET-PG:** * **I GET SMASHED:** Mnemonic for causes (Idiopathic, Gallstones, Ethanol, Trauma, Steroids, Mumps, Autoimmune, Scorpion sting, Hypertriglyceridemia/Hypercalcemia, ERCP, Drugs) [1]. * **Lipase vs. Amylase:** Serum lipase is more specific and remains elevated longer than amylase. * **Sentinel Loop:** A localized ileus of the jejunum seen on X-ray is a classic sign. * **Cullen’s/Grey Turner’s signs:** Indicate hemorrhagic pancreatitis (periumbilical/flank ecchymosis).

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Esophageal Disorders

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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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