Background: Henoch-Schönlein purpura (HSP), also known as rheumatic purpura, is an immune complex vasculitis affecting small vessels with dominant IgA deposits. Clinical manifestations mainly involve cutaneous arthralgias and/or arthritis, acute enteritis and glomerulonephritis. HSP more common among children than adults. Kidney damage the principal prognostic determinant in HSP. The aim of thi...