[Solitary Fibrous Tumor of the Urinary Bladder which was Incidentally Found by MRI : A Case Report].

A 72-year-old female complained of pain in the left hip and consulted a local orthopedic surgeon. Magnetic resonance imaging (MRI) was conducted for the left hip. MRI revealed a subchondral insufficiency fracture of the left femoral head and pointed out a bladder tumor 65 mm in size. Hence, the patient was referred to our department for further examination. Cystoscopy revealed a smooth surface tumor protruding from the left side of the bladder neck. Therefore, transurethral resection of bladder tumor (TURBT) was performed. Pathological finding showed spindle-shaped cells surrounded by collagen fibers. Immunostaining demonstrated that CD34 and Bcl-2 were positive. The final diagnosis was a solitary fibrous tumor (SFT). A TURBT was performed 3 years after initial TURBT for recurrence of a 25 mm tumor in the bladder trigone. The pathological diagnosis was SFT. Since the last surgery, which was performed 30 months ago, no recurrence has been observed.