Secondary (AA-type) amyloidosis in patients with polymyalgia rheumatica.

Several cases of systemic amyloidosis associated with polymyalgia rheumatica (PMR) or giant-cell arteritis (GCA) have been described. Nevertheless, the type of amyloid deposit has not been characterized in most of them. Here we report on two patients with PMR (one with associated GCA) who developed nephrotic syndrome and end-stage renal failure caused by massive amyloid deposition. Immunohistochemical analysis showed that the amyloid deposits were of AA type (secondary amyloidosis) in both cases.