Dermatological semiology of Cutaneous Vasculitis Clinicopathologic correlations • Purpura, papules, pustules, necrosis: involvement of small vessels • Nodules, livedo, necrosis : involvement of smooth muscle wall vessels (medium-sized vessel) Identification of causes in the context of cutaneous vasculitis • Cutaneous leukocytoclastic angiitis (40%) • Drug-induced vasculitis (20%) • Connective tissue disease (10%) : SLE +++ • IgA vasculitis (10%) • Necrotizing vasculitis (5%): PAN > GPA, EGPA • Solid cancers/hemopathies (4%) • Cryoglobulinemia vasculitis (3%) • Infections (1-2%) • Other: IBD, sarcoidosis, . By Dr. Laure Frumholtz via Dr. Benjamin Terrier @TerrierBen #Cutaneous #Vasculitis #dermpath #dermatology #semiology #signs #lesions #diagnosis #clinical #manifestations #pathology #lesions #differential
