[Primary amyloidosis of the bladder: a case report].

A case of primary amyloidosis of the bladder, which developed 4 years after primary treatment, is described. The patient is a 55-year-old male, who consulted our clinic with a complaint of asymptomatic gross hematuria on October 1, 1983. Cystoscopic examination showed a tumorous lesion involving right lateral wall of the bladder, which was resected transurethrally. No malignancy was found by histopathological examination. About 4 years later, he consulted our clinic again with a complaint of asymptomatic gross hematuria. There was a tumorous lesion involving left lateral wall of the bladder on cystoscopy. Transurethral resection of bladder tumor was performed under a diagnosis of bladder tumor. Histological examination revealed amyloidosis of the bladder, AL-type amyloid. Re-examination of the specimens resected 4 years ago showed the same findings. Biopsies from the tongue, skin and rectum disclosed no amyloid deposition. During these 19 months, he had no recurrence. This case was thought to be the first one of primary amyloidosis of the bladder showing new recurrence reported in Japanese literature.