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Henoch-Schonlein Purpura HSP is a small vessel vasculitis ==> Related to IgA nephropathy; however, IgA nephropathy more often involves young adults and predominantly affects the kidneys. Generally, HSP is a benign, self-limited disease. Pt s are NOT TOXIC appearing. ARENA (common symptoms) ==> Abdominal Pain and Vomitting (85%) +/- Bloody Stools ==> Rash (95-100%) ==> Edema (20-50%), peripheral or scrotal ==> Nephritis ==> Arthritis / Arthragias (60-80%) particularly of knees and ankles Steroids are controversial no definitive controlled trials demonstrate their efficacy.