TY - CHAP M1 - Book, Section TI - Henoch-Schönlein Purpura A1 - Ang, Elizabeth A1 - Sundel, Robert A2 - Zaoutis, Lisa B. A2 - Chiang, Vincent W. PY - 2017 T2 - Comprehensive Pediatric Hospital Medicine, 2e AB - Henoch-Schönlein purpura (HSP) is also known as anaphylactoid purpura or purpura rheumatica. It is a leukocytoclastic vasculitis affecting small blood vessels in virtually any organ system, but predominantly the skin, joints, and kidneys. HSP is the most common type of childhood systemic vasculitis, with an annual incidence of 10 to 20 per 100,000 children less than 17 years of age and a slight male predominance.1 Most patients are between the ages of 3 and 10 years, with the peak age of onset 4 to 6 years. The clinical course is usually benign and self-limited, although a small proportion of patients may have significant long-term sequelae, mainly as a result of renal involvement. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1146122378 ER -