Henoch-Schönlein purpura

Disorder	Vasculitis	Epidemiology/Etiology	Clinical/Laboratory Findings
Henoch-Schönlein purpura	Small vessel vasculitis involving skin, GI tract, renal, joint vessels	Children and young adults Most common vasculitis in children IgA immunocomplexes	Palpable purpura of buttocks and lower extremities Polyarthritis, glomerulonephritis, GI bleeding