During gold therapy a patient with rheumatoid arthritis developed nephrotic syndrome, and a patient with juvenile chronic arthritis proteinuria. Electron microscopic examination of bioptic specimens of the kidneys revealed in both instances membranous glomerulonephritis with typical epimembranous deposits and intracellular gold inclusions. Immunofluorescent examination performed only in the second patient revealed that the deposits in the wall of the glomerular capillaries contain IgG which suggests an immunocomplex mechanism of the development of the renal disease, induced very probably by chrysotherapy.
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