Clinical features of anti-neutrophil cytoplasmic antibody-associated systemic vasculitis in French children

Results Forty-seven children were included, 15 (32%) with WG and 32 (68%) with MPA, 77% children were pANCA +/MPO. Female predominated (85%), the median age at diagnosis was 10 years (2-16), and average time to diagnosis was 8 months (0-58). 53% children presented with fever, 77% with deterioration of general condition. 91% had renal involvement. Among them 91% had proteinuria, 44% had hypertension, 79% had renal failure of whom one third presented with end-stage renal disease (ESRD), 22% had gross hematuria and 82% microscopic hematuria. Half the patients showed pulmonary involvement (alveolar hemorrhage for 77% and nodules for 18%). 28% presented with upper airways involvement, 38% with cutaneous lesions (67% purpura), and 19% with arthritis. Few had digestive, ophthalmic or CNS involvement. After an average follow-up of 5 years (2m24y), 3 patients (6%) died. 60% were considered in remission (partial or total) after induction treatment and 77% at last follow-up. 33% of children with initial renal involvement developed chronic kidney disease, half of them progressed to ESRD. 43% needed dialysis and 29% underwent a renal transplantation.