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Mesangial IgG in childhood minimal change disease: clinical relevance.

The clinical courses of five children with the nephrotic syndrome and renal biopsies diagnosed as minimal change disease (MCD) by light microscopy but with mesangial immune deposits of IgG (> or = 2+) and no dominant or codominant IgA were reviewed retrospectively to determine if the presence of significant mesangial deposits of IgG has prognostic implications and to evaluate the treatment these patients received. All five of the children were steroid dependent or resistant initially, and four received cyclosporine or cytotoxic agents later. After a mean follow-up period of 2.9 years for four and 20 years for one, all are in remission. All have normal renal function with no hypertension. These results suggest that the deposition of IgG in the mesangium of biopsies from patients with MCD by light microscopy may predict a more difficult course initially and may require more aggressive treatment to achieve permanent remission.