Gastroenterology — MCQs

Gastroenterology Indian Medical PG Practice Questions and MCQs

Question 1151: A 40-year-old man presents with epigastric pain that improves with meals but worsens at night. Endoscopy reveals a well-defined ulcer in the duodenum. Which organism is most commonly associated with this condition?

A. Helicobacter pylori (Correct Answer)
B. Escherichia coli
C. Candida albicans
D. Clostridium difficile

Explanation: ***Helicobacter pylori*** - *H. pylori* infection is the leading cause of **duodenal ulcers**, accounting for over 90% of cases [1]. Its presence leads to chronic inflammation and damage to the protective mucosal lining [1]. - The constellation of epigastric pain relieved by food and worsening at night, along with a **duodenal ulcer** on endoscopy, is highly suggestive of *H. pylori*-associated disease [1]. *Escherichia coli* - *E. coli* is a common bacterium in the gut flora but is generally not associated with **peptic ulcer disease** [2]. - While certain strains can cause gastrointestinal issues like **diarrhea** or urinary tract infections, it typically does not cause ulcers in the duodenum. *Candida albicans* - *Candida albicans* is a fungus that can cause infections (candidiasis), most commonly in the **oral cavity** (thrush) or **esophagus** in immunocompromised individuals. - It is not a known causative agent of **duodenal ulcers** in immunocompetent patients. *Clostridium difficile* - *Clostridium difficile* is a bacterium primarily associated with **pseudomembranous colitis**, often following antibiotic use. - It causes severe **diarrhea** and colonic inflammation, not duodenal ulcers.

Question 1152: A 70-year-old male presents with abdominal pain and weight loss. A barium enema shows an 'apple core' lesion. What is the most likely diagnosis?

A. Diverticulosis
B. Colon cancer (Correct Answer)
C. Crohn's disease
D. Ulcerative colitis

Explanation: ***Colon cancer*** - An **'apple core' lesion** on a barium enema is a classic radiographic sign highly suggestive of an obstructing **colorectal carcinoma** [1]. - The patient's age combined with **abdominal pain** and **weight loss** are common symptoms of advanced colon cancer [1]. *Diverticulosis* - Characterized by the presence of **diverticula** (outpouchings) in the colon, which are not typically associated with an 'apple core' lesion. - While diverticulosis can cause abdominal pain, **weight loss** is not a common associated symptom. *Crohn's disease* - Often presents with **skip lesions**, **transmural inflammation**, and sometimes **strictures**, but not typically an 'apple core' appearance [2]. - While it can cause abdominal pain and weight loss, it is more common in younger patients and has distinct endoscopic and histological features [2]. *Ulcerative colitis* - Involves **continuous inflammation** of the colon, starting from the rectum, and is characterized by mucosal rather than transmural involvement. - It does not present with an 'apple core' lesion and often causes bloody diarrhea, which is not mentioned in this case.

Question 1153: A 7-year-old with recurrent abdominal pain, diarrhea, weight loss, joint pain, and a non-pruritic rash presents with laboratory findings of anemia, high ESR, and positive ASCA. What is the most likely diagnosis?

A. Celiac disease
B. Henoch-Schönlein purpura
C. Crohn's disease (Correct Answer)
D. Ulcerative colitis

Explanation: ***Crohn's disease*** - The combination of **recurrent abdominal pain**, **diarrhea**, **weight loss**, **joint pain**, and a **non-pruritic rash** (erythema nodosum or pyoderma gangrenosum) is highly suggestive of **Crohn's disease** in a child [1]. - The laboratory findings of **anemia**, **elevated ESR**, and especially **positive ASCA (anti-Saccharomyces cerevisiae antibodies)** strongly support this diagnosis, as ASCA is more specific to Crohn's than ulcerative colitis [1]. *Celiac disease* - While it can cause abdominal pain, diarrhea, and weight loss, celiac disease does not typically present with **joint pain** or a **non-pruritic rash** (dermatitis herpetiformis is pruritic). - It is diagnosed by **IgA anti-tissue transglutaminase (tTG)** and **anti-endomysial antibodies (EMA)**, and does not involve positive ASCA. *Henoch-Schönlein purpura* - Characterized by palpable **purpura**, **arthritis**, **abdominal pain**, and **renal involvement**, but the rash is typically purpuric and the abdominal pain is often colicky with potential for intussusception. - It is an **IgA-mediated vasculitis** and does not present with chronic diarrhea, weight loss, or positive ASCA. *Ulcerative colitis* - Presents with diarrhea (often bloody), abdominal pain, and weight loss, but **joint pain** and **rash** tend to be less common and less severe than in Crohn's [1]. - While it can also be associated with elevated ESR and anemia, **ASCA is typically negative** or weakly positive, and **p-ANCA** is more commonly positive.

Question 1154: A 12-year-old boy presents with jaundice, dark urine, and pale stools. He is diagnosed with autoimmune hepatitis. Which antibody is most likely to be positive?

A. Anti-Mitochondrial Antibody
B. Anti-Smooth Muscle Antibody (ASMA) (Correct Answer)
C. Anti-Liver/Kidney Microsomal Antibody
D. Anti-Nuclear Antibody

Explanation: ***Anti-Smooth Muscle Antibody (ASMA)*** - **Type 1 autoimmune hepatitis** often presents in children and young adults, and is characterized by a high prevalence of **anti-smooth muscle antibodies (ASMA)** and/or **anti-nuclear antibodies (ANA)** [1]. - The presence of **jaundice**, **dark urine**, and **pale stools** in a 12-year-old boy is consistent with acute hepatitis. *Anti-Mitochondrial Antibody* - This antibody is the serological hallmark of **primary biliary cholangitis (PBC)**, an autoimmune disease primarily affecting the small bile ducts, more common in middle-aged women [2]. - It is not typically associated with classic childhood autoimmune hepatitis and would not explain the presented symptoms. *Anti-Liver/Kidney Microsomal Antibody* - This antibody (specifically **anti-LKM1**) is primarily associated with **Type 2 autoimmune hepatitis**, which often affects younger children (preschool age) and can have a more severe clinical course. - While possible, ASMA (and ANA) are most commonly found in Type 1, which has a broader age range including 12-year-olds. *Anti-Nuclear Antibody* - **Anti-nuclear antibody (ANA)** can be positive in Type 1 autoimmune hepatitis, similar to ASMA [1]. - However, ASMA is often more specific for autoimmune hepatitis particularly in patients presenting with these features, while ANA can be positive in many other autoimmune conditions [3].

Question 1155: Which condition is most commonly associated with the development of esophageal varices?

A. Alcoholic liver disease (Correct Answer)
B. Gallstone disease
C. Peptic ulcer disease
D. Pancreatitis

Explanation: ***Alcoholic liver disease*** - **Alcoholic liver disease** is a major cause of cirrhosis [1], which leads to portal hypertension and the development of **esophageal varices** [1]. - The chronic inflammation and fibrosis in the liver due to alcohol consumption obstruct blood flow, resulting in increased pressure in the **portal venous system** [1]. *Gallstone disease* - **Gallstone disease** primarily involves the formation of calculi in the gallbladder or bile ducts, leading to conditions like cholecystitis or choledocholithiasis. - It does not directly cause **portal hypertension** or **esophageal varices**. *Peptic ulcer disease* - **Peptic ulcer disease** involves erosions in the lining of the stomach or duodenum, typically caused by *H. pylori* infection or NSAID use. - While it can cause upper gastrointestinal bleeding, it is not a direct cause of **esophageal varices**. *Pancreatitis* - **Pancreatitis** is the inflammation of the pancreas, often due to gallstones or alcohol abuse [2], and can cause severe abdominal pain. - Although severe pancreatitis can occasionally lead to splenic vein thrombosis, which may rarely contribute to **left-sided portal hypertension** (gastric varices), it is not the most common cause of **esophageal varices** [1].

Question 1156: A patient presents with a distended abdomen and jaundice. Blood tests reveal elevated ammonia levels. What is the most likely cause of the hyperammonemia?

A. Liver failure (Correct Answer)
B. Kidney failure
C. Pancreatitis
D. Heart failure

Explanation: ***Liver failure*** - **Liver failure** impairs the liver's ability to convert ammonia to urea, leading to its accumulation in the blood [1]. - The symptoms of a **distended abdomen** (due to ascites) and **jaundice** (due to impaired bilirubin metabolism) are classic signs of advanced liver disease [2]. *Kidney failure* - **Kidney failure** primarily affects the excretion of waste products like urea and creatinine, but it is not a direct cause of **hyperammonemia**. - While severe kidney failure can cause some ammonia accumulation, it is typically secondary to impaired renal ammoniagenesis or metabolic acidosis, not the primary mechanism behind the symptoms described. *Pancreatitis* - **Pancreatitis** involves inflammation of the pancreas and typically presents with severe abdominal pain, nausea, and vomiting. - It does not directly cause **jaundice** or **hyperammonemia**, although it can be a complication of underlying conditions that might also affect the liver or bile ducts. *Heart failure* - **Heart failure** can lead to symptoms like edema and shortness of breath, but it does not directly cause **jaundice** or **hyperammonemia**. - While severe right-sided heart failure can cause **congestive hepatopathy** and mild liver dysfunction, it is rarely the primary cause of such pronounced jaundice and hyperammonemia as described.

Question 1157: A 45-year-old woman with a history of irritable bowel syndrome presents with chronic abdominal pain, bloating, and diarrhea. Which of the following is most likely to improve her symptoms?

A. High-fiber diet
B. Lactose-free diet
C. Probiotics
D. Low-FODMAP diet (Correct Answer)

Explanation: ***Low-FODMAP diet*** - This diet restricts **fermentable oligosaccharides, disaccharides, monosaccharides, and polyols**, which are poorly absorbed carbohydrates that can ferment in the gut, causing gas, bloating, and pain common in **irritable bowel syndrome (IBS)** [1]. - Clinical trials have shown that a **low-FODMAP diet** can significantly reduce symptoms like **abdominal pain**, **bloating**, and **diarrhea** in a substantial number of IBS patients [1]. *High-fiber diet* - While fiber is generally healthy, a **high-fiber diet** can exacerbate symptoms such as **bloating** and **gas** in some IBS patients, particularly those with IBS-D (diarrhea-predominant IBS), due to increased colonic fermentation. - The type of fiber matters; **soluble fiber** may be better tolerated than **insoluble fiber** for IBS symptoms, but increasing overall fiber can still worsen symptoms for many. *Lactose-free diet* - A **lactose-free diet** is beneficial only if the patient has **lactose intolerance**, which can mimic some IBS symptoms [2]. However, not all IBS patients are lactose intolerant, and adopting this diet won't address other dietary triggers. - While lactose intolerance can coexist with IBS, it's a specific food intolerance, and eliminating lactose alone is unlikely to alleviate the broad spectrum of IBS symptoms if other **FODMAPs** are still being consumed [2]. *Probiotics* - **Probiotics** can be helpful for some IBS patients by modulating gut microbiota and reducing inflammation, but their efficacy varies widely among individuals and specific strains. - While recommended as a potential adjunct therapy, **probiotics** are generally not considered the *most likely* single intervention to comprehensively improve all primary symptoms of IBS-D like a **low-FODMAP diet** [1].

Question 1158: A patient with a long history of alcohol use presents with abdominal pain and weight loss. A CT scan shows pancreatic calcifications. Which condition is consistent with these findings?

A. Acute pancreatitis
B. Chronic pancreatitis (Correct Answer)
C. Pancreatic pseudocyst
D. Pancreatic adenocarcinoma

Explanation: ***Chronic pancreatitis*** - Long-term **alcohol use** can lead to pancreatic damage, causing **calcifications** in the pancreas, as seen on CT [1]. - Symptoms like **abdominal pain and weight loss** are classical signs associated with chronic pancreatic inflammation [1]. *Pancreatic pseudocyst* - Typically arises as a **complication of acute pancreatitis**, characterized by collections of fluid rather than calcifications. - Doesn't usually cause weight loss directly and is often asymptomatic unless gland dysfunction occurs. *Pancreatic adenocarcinoma* - While it may present with weight loss, it typically does not result in **pancreatic calcifications**; rather, it presents with masses on imaging. - Symptoms are usually more insidious, including **jaundice** and new-onset diabetes, not simply abdominal pain. *Acute pancreatitis* - Often associated with severe abdominal pain, but would not show calcifications prominently on imaging. - It typically presents with **edema and fluid collections**, not the chronic fibrosis and calcifications seen in chronic pancreatitis.

Question 1159: A 30-year-old woman presents with abdominal pain, hepatomegaly, and Kayser-Fleischer rings. What disorder is consistent with these findings?

A. Hemochromatosis
B. Wilson disease (Correct Answer)
C. Alpha-1 antitrypsin deficiency
D. Non-alcoholic fatty liver disease

Explanation: ***Wilson disease*** - Characterized by **copper accumulation** in tissues [1], which leads to **hepatomegaly** and **Kayser-Fleischer rings** in the cornea. - Symptoms often include **abdominal pain** due to liver involvement and potential neurological effects [1]. *Hemochromatosis* - Involves **iron overload** rather than copper [2], typically leading to **diabetes**, skin pigmentation, and arthropathy. - Kayser-Fleischer rings are not present; they are specific to Wilson disease. *Non-alcoholic fatty liver disease* - Primarily related to **insulin resistance** and does not cause Kayser-Fleischer rings. - Symptoms typically include **elevated liver enzymes** rather than specific neurological or ocular manifestations. *Alpha-1 antitrypsin deficiency* - Associated with **lung disease** and sometimes liver disease but lacks Kayser-Fleischer rings and has different clinical features. - Often presents with **pulmonary symptoms** such as **emphysema** along with liver issues.

Question 1160: A patient with a history of chronic pancreatitis presents with a palpable mass in the abdomen. What is the most likely diagnosis and the appropriate diagnostic procedure?

A. Chronic liver disease, liver biopsy
B. Gastric ulcer, upper endoscopy
C. Pancreatic cancer, CT scan of the abdomen (Correct Answer)
D. Pancreatic pseudocyst, abdominal ultrasound

Explanation: Pancreatic cancer, CT scan of the abdomen - Chronic pancreatitis is a significant **risk factor for pancreatic cancer**, and a new palpable mass in this context is highly suspicious for malignancy. - A **CT scan of the abdomen** is the initial and most appropriate diagnostic imaging study to characterize a pancreatic mass, assess for local invasion, and look for metastatic disease [1]. *Chronic liver disease, liver biopsy* - While chronic pancreatitis can sometimes lead to liver issues (e.g., secondary biliary cirrhosis), a **palpable abdominal mass** is not a primary presentation of chronic liver disease itself. - A **liver biopsy** is primarily used to diagnose diffuse liver pathologies, not a localized abdominal mass of unknown origin originating from a different organ. *Gastric ulcer, upper endoscopy* - A **gastric ulcer** would typically cause epigastric pain, possibly with bleeding, and is not typically associated with a palpable abdominal mass. - An **upper endoscopy** is the correct procedure for diagnosing gastric ulcers but would not be the initial approach for a palpable mass associated with chronic pancreatitis. *Pancreatic pseudocyst, abdominal ultrasound* - Pancreatic pseudocysts are a common complication of chronic pancreatitis and can present as a **palpable mass** [2]. - However, while **abdominal ultrasound** can detect pseudocysts [2], a **CT scan** provides much better detail on the cyst's relation to other structures, calcifications, and potential complications, making it generally superior for initial characterization in a patient with a known history of chronic pancreatitis and a new mass, especially when malignancy is a concern [1].

Practice by Chapter

Esophageal Disorders

Practice Questions

Peptic Ulcer Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Irritable Bowel Syndrome

Practice Questions

Malabsorption Syndromes

Practice Questions

Pancreatitis (Acute and Chronic)

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Liver Diseases and Cirrhosis

Practice Questions

Viral Hepatitis

Practice Questions

Biliary Tract Disorders

Practice Questions

Gastrointestinal Motility Disorders

Practice Questions

Gastrointestinal Malignancies

Practice Questions

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