Two cases of renal impairment caused by the deposition of monoclonal immunoglobulin light-chain determinants in the glomerular mesangium and basement membranes as well as in the tubular basement membranes of the kidney are described (light-chain nephropathy). Both cases were associated with myeloma. Examinations by light microscopy, immunohistochemistry and electron microscopy are also described. Differential diagnoses on light microscopy include diabetic glomerulosclerosis (Kimmelstiel-Wilson lesions), amyloidosis and mesangiocapillary glomerulonephritis type 1.
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