Inflammatory Bowel Disease USMLE Step 1 Practice Question
A 10-month-old boy presents with episodic severe colicky abdominal pain and leg flexion, followed by bilious vomiting and lethargy. Vitals show HR 128/min, RR 26/min, BP 95/60 mmHg, and temp 38.2°C. He has passed bloody stools with a currant jelly appearance. Abdominal ultrasound demonstrates a target sign in the right abdomen. CBC shows mild leukocytosis (WBC 13,200/μL). There is no fever preceding symptom onset. Which of the following is the most likely diagnosis?
Answer choices
- AHypertrophic pyloric stenosis
- BIntussusceptionCorrect answer
- CMeckel diverticulum
- DNecrotizing enterocolitis
- EHirschsprung disease
- FMidgut volvulus
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