MD - Doctor of Medicine Gastrointestinal Tract Disorders Questions and Answers — Questions and Answers
Question 1: Which of the following histopathological findings is most characteristic of Crohn's disease and helps differentiate it from ulcerative colitis?
- Crypt abscesses
- Continuous inflammation limited to the mucosa
- Non-caseating granulomas (Correct answer)
- Pseudopolyps
Correct answer: Non-caseating granulomas
Non-caseating granulomas are a hallmark of Crohn's disease, found in a significant number of cases, and are not seen in ulcerative colitis. Their presence points to the transmural, granulomatous inflammation characteristic of Crohn's. Crypt abscesses and pseudopolyps can be seen in both conditions but are more typical of ulcerative colitis. Continuous inflammation limited to the mucosa is the classic description for ulcerative colitis, whereas Crohn's disease is characterized by discontinuous (skip lesions) and transmural inflammation.
Question 2: A 34-year-old woman presents with chronic diarrhea, bloating, and significant weight loss. Serological testing is positive for IgA anti-tissue transglutaminase (tTG) antibodies. An upper endoscopy with duodenal biopsy is performed. Which of the following biopsy findings would confirm the diagnosis of celiac disease?
- Villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes (Correct answer)
- Glandular atrophy and intestinal metaplasia
- Foamy macrophages within the lamina propria
- Transmural inflammation with skip lesions
Correct answer: Villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes
The classic histopathological triad for celiac disease on a duodenal biopsy is villous atrophy, crypt hyperplasia, and an increase in intraepithelial lymphocytes. This combination confirms the diagnosis in the setting of positive serology. Glandular atrophy and intestinal metaplasia are seen in conditions like atrophic gastritis. Foamy macrophages are characteristic of Whipple disease. Transmural inflammation with skip lesions is a feature of Crohn's disease.
Question 3: A 52-year-old male is diagnosed with a duodenal ulcer, and a urease breath test is positive for Helicobacter pylori. He has no known drug allergies. According to the most recent ACG (American College of Gastroenterology) guidelines, which of the following is a recommended first-line treatment regimen?
- A proton pump inhibitor (PPI) and amoxicillin for 10 days.
- Bismuth subsalicylate, metronidazole, tetracycline, and a PPI for 14 days. (Correct answer)
- Esomeprazole and ranitidine for 8 weeks.
- Omeprazole, clarithromycin, and metronidazole for 7 days.
Correct answer: Bismuth subsalicylate, metronidazole, tetracycline, and a PPI for 14 days.
Recent ACG guidelines recommend bismuth quadruple therapy (a PPI, bismuth, metronidazole, and tetracycline for 14 days) as a preferred first-line treatment for H. pylori, largely due to rising clarithromycin resistance. Clarithromycin-based triple therapy is no longer recommended as a primary empiric option in many regions. A PPI and amoxicillin alone is insufficient for eradication. A PPI with an H2 blocker will heal the ulcer but not treat the underlying H. pylori infection.
Question 4: A 48-year-old man with a history of alcohol abuse presents with severe epigastric pain radiating to the back. His serum lipase is markedly elevated. On day two of admission, he develops a respiratory rate of 24/min, a heart rate of 110 bpm, and his BUN increases from 18 to 30 mg/dL. Which of the following is the best indicator of a severe disease course in this patient?
- The degree of lipase elevation.
- The etiology being alcohol-related.
- The development of Systemic Inflammatory Response Syndrome (SIRS). (Correct answer)
- The presence of epigastric tenderness on exam.
Correct answer: The development of Systemic Inflammatory Response Syndrome (SIRS).
The development and persistence of Systemic Inflammatory Response Syndrome (SIRS) is a key predictor of severity and mortality in acute pancreatitis, as it often precedes organ failure. The patient's tachycardia, tachypnea, and rising BUN (indicating renal dysfunction) are signs of SIRS and organ dysfunction. The absolute level of lipase does not correlate with disease severity. While alcohol is a common cause, the etiology itself is not as strong a prognostic indicator as the patient's systemic response. Epigastric tenderness is an expected finding but does not predict severity.
Question 5: A 45-year-old asymptomatic woman with no family history of colorectal cancer (CRC) presents for a routine physical. According to the current guidelines from the U.S. Preventive Services Task Force (USPSTF), what is the recommended age to begin average-risk CRC screening?
- 55 years
- 50 years
- 40 years
- 45 years (Correct answer)
Correct answer: 45 years
In May 2021, the U.S. Preventive Services Task Force (USPSTF) updated its guidelines, lowering the recommended age to begin colorectal cancer screening for average-risk individuals from 50 to 45 years. This change was based on data showing an increasing incidence of CRC in younger adults.
Question 6: Which of the following best describes the key histopathological change seen in Barrett's esophagus and the primary long-term risk associated with this condition?
- Squamous metaplasia; increased risk of esophageal stricture.
- Intestinal metaplasia; increased risk of esophageal adenocarcinoma. (Correct answer)
- Glandular hyperplasia; increased risk of esophageal squamous cell carcinoma.
- Muscular hypertrophy; increased risk of achalasia.
Correct answer: Intestinal metaplasia; increased risk of esophageal adenocarcinoma.
Barrett's esophagus is a complication of chronic GERD characterized by the replacement of the normal stratified squamous epithelium of the esophagus with specialized intestinal metaplasia, which includes goblet cells. This metaplastic change is the most important risk factor for the development of esophageal adenocarcinoma. Squamous cell carcinoma is typically associated with smoking and alcohol, not Barrett's esophagus.
MD - Doctor of Medicine Gastrointestinal Tract Disorders Questions and Answers
Which of the following histopathological findings is most characteristic of Crohn's disease and helps differentiate it from ulcerative colitis?