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IgA vasculitis — ABEM Board MCQ

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EasyPediatric emergenciesIgA vasculitisABEM Board

A 5-year-old girl arrives as ESI 3 with palpable purpura on the legs, colicky abdominal pain, and ankle swelling after an upper respiratory infection. BP is normal and urinalysis shows microscopic hematuria. Which of the following is the most likely diagnosis?

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Correct answer: B — IgA vasculitis

Palpable purpura, arthralgia, abdominal pain, and renal findings after URI are typical of IgA vasculitis.

Reference: AAP pediatric emergency medicine; ACR vasculitis classification references