title: Late development of purpura in a patient with glomerulonephritis.
abstract: A 20-year-old man with a 10-year history of glomerulonephritis presented with a purpuric rash on his legs. A renal biopsy specimen obtained when he was 11 years old had shown mesangial glomerulonephritis; staining 9 years later for IgA had negative results. A second renal biopsy, performed when the rash was present, revealed mesangial glomerulonephritis and mesangial deposits of IgA; biopsies of the involved skin showed leukocytoclastic vasculitis. In this case isolated glomerulonephritis appeared to change to a multisystem illness, with a different immunologic character, through one of several possible pathogenetic mechanisms.
mesh_terms: D000328:Adult; D005920:Glomerular Mesangium / Q000648:ultrastructure*; D005921:Glomerulonephritis / Q000150:complications / Q000276:immunology / Q000473:pathology*; D006801:Humans; D011695:IgA Vasculitis / Q000209:etiology* / Q000276:immunology / Q000473:pathology; D007070:Immunoglobulin A / Q000032:analysis*; D008297:Male
chemical_list: D007070:Immunoglobulin A