disease has basis in disruption of disease caused by disruption of hypersensitivity hypersensitivity reaction disease hypersensitivity vasculitis https://www.malacards.org/card/hypersensitivity_vasculitis ICD9:446.20 GARD:0024475 ICD9:446.29 SCTID:60555002 A small vessel vasculitis affecting the skin and/or internal organs. It is characterized by the presence of neutrophils and fibrinoid necrosis in small arteries and venules. It may be idiopathic or the result of drug treatment, infections, food intake, collagen vascular disorders, inflammatory bowel disease, or cancer. DOID:9809 UMLS:C2973529 leukocytoclastic vasculitis MONDO:0006794 EFO:1000974 MedDRA:10020764 MEDGEN:445500 NCIT:C82863 ICD9:446.2 type III hypersensitivity disease vasculitis