Metastases from transitional cell carcinoma of the bladder masquerading as psoas abscess.

Metastases from transitional cell carcinoma of the bladder usually progress in a stepwise fashion. We report that first case of metastasis to the body of the psoas muscle. No evidence of retroperitoneal lymphatic involvement or direct extension was identified. Furthermore, the original tumor was superficial but the history was complicated by perforation of the bladder during resection.