Henoch-Schönlein purpura (HSP), or anaphylactoid purpura, is an acute, self-limited small-vessel vasculitis commonly affecting children aged 3-10. It features a classic tetrad: palpable non-thrombocytopenic purpura, abdominal pain, polyarthralgia, and renal involvement. While the prognosis is generally favorable, long-term outcomes depend on renal involvement.
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