title: Severe cutaneous vasculitis complicating ulcerative colitis.
mesh_terms: D000293:Adolescent; D003093:Colitis, Ulcerative / Q000150:complications* / Q000473:pathology; D006801:Humans; D008297:Male; D009336:Necrosis; D012867:Skin / Q000473:pathology*; D014657:Vasculitis / Q000473:pathology; D018366:Vasculitis, Leukocytoclastic, Cutaneous / Q000150:complications*