[Primary amyloidosis in the bladder: diagnostic and therapeutic update].

We describe an additional case of primary amyloidosis of the bladder whose form of presentation warranted a differential diagnosis from carcinoma of the bladder. The diagnosis was made on the histological findings and the immunohistochemical analyses revealed amyloid fibrils that reacted against the light chain lambda antiserum. The treatment of choice was TUR, which resolves the condition in most of the cases. Conservative surgery, however, does not prevent new deposits and undetected residual lesions may persist, which may warrant other complementary procedures in these patients. After the diagnosis has been made, it is important to discard systemic amyloidosis.