Henoch-Schönlein purpura and membranoproliferative-like glomerulonephritis.

A 17-year-old man presented Henoch-Schönlein purpura with renal impairment, nephrotic syndrome needing transitory hemodialysis and hematuria. By light microscopy, the renal biopsy revealed membranoproliferative-like lesion associated with massive subendothelial deposits, some subepithelial deposits, hyalin thrombi and intracapillary neutrophils. By immunofluorescence, intense nodular and segmental deposits of IgG, IgM, IgA, C3, fibrinogen and C1q were found to be present in the intracapillary area and the mesangium. By electron microscopy, large subendothelial and rare subepithelial deposits were observed. A skin biopsy demonstrated leukocytoclastic skin vasculitis with IgA deposits in the arterial walls. Treatment with corticosteroids resulted in return renal to normal renal function but persistent proteinuria and hematuria. A second renal biopsy, performed after 2 months, showed a marked decrease in lesions and deposits. Fifteen months later, the patient presented normal serum creatinine level but proteinuria and hematuria persisted. At this time, a third renal biopsy was performed and showed segmental mesangial sclerosis and the decrease of disappearance of deposits. Two years after the first hospitalization, no abnormal serum creatinine or urinalysis were present. This report describes a detailed study of a case presented with Henoch-Schönlein purpura and morphologic features consistent with membranoproliferative-like lesion, who recovered normal renal function and urinalysis; repeat biopsies performed at intervals of 2 months and 1 year confirmed the disappearance of mesangial proliferation, double contours and deposits.