An Adult Atypical Fibromyxoid Tumor of the Urinary Bladder

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Abstract
A case of atypical fibromyxoid tumor of the urinary bladder in a 32-year-old woman is reported. The patient had never complained of urinary symptoms, and bladder tumefaction was revealed fortuitously at pelvic ultrasound. Cystoscopy revealed a peanut-sized mass. Microscopically, the lesion was composed of strap- and tadpole-shaped cells resembling rhabdo-myoblasts. For this reason, the tumor was initially diagnosed as embryonal rhabdomyosarcoma. However, immunohistochemical study was negative for muscle origin, and the tumor has subsequently proved benign. The reported case illustrates the value of immunohistochemical study in the evaluation of the true type of bizarre stroma cells in this pseudo-sarco-matous lesion. Their recognition is important, because the therapeutic consequences of misinterpreting this tumor as a sarcoma are great.