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IgA vasculitis — MCCQE Part 1 MCQ

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ModerateRashIgA vasculitisMCCQE Part 1

A 7-year-old boy has palpable purpura on the legs and buttocks, colicky abdominal pain and ankle arthralgia after an upper respiratory infection. Platelet count is normal. Which of the following is the most likely diagnosis?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: C — IgA vasculitis

Palpable purpura with abdominal pain and arthralgia in a child with normal platelets is typical IgA vasculitis. ITP causes thrombocytopenic petechiae rather than palpable vasculitis. Urinalysis and blood pressure follow-up are important because renal involvement may appear later.

Reference: Canadian Paediatric Society nephrology/rheumatology practice; paediatric vasculitis pathways