RESUMO
Proliferative glomerulonephritis with monoclonal IgG deposits (PGNMID) is a recently described disorder that belongs to the class of monoclonal gammopathy of renal significance with the incidence of 0.17%. Monoclonal IgG deposits in glomeruli can produce a proliferative glomerulonephritis that mimics immune-complex mediated glomerulonephritis by light microscopy (LM) and electron microscopy (EM). Proper recognition of this disease requires confirmation of monoclonality by immunofluorescence (IF) staining. We present here a 50 year old female patient presented with nephrotic range proteinuria and normal renal function. Renal biopsy showed endocapillary and mesangial proliferation by LM. IF showed Ig G (+2) and C3 (+2) with positivity for Lambda light chain and Kappa light chain is negative consistent with PGNMID.