[Urinary bladder transitional cell carcinoma with trophoblastic differentiation].

Transitional cell carcinoma (TCC) with trophoblastic differentiation (TD) is a newly recognized variant of urothelial cancer which produces placental proteins, predominantly beta-human chorionic gonadotropin (HCG). It has a poor prognosis. About 210 cases were described, mostly from North America, Europe and Japan. This is the first report of TCC TD in a resident of Israel's upper Galilee. A 69-year-old man whose urinary papillary bladder tumor was established cystoscopically, refused treatment and stopped follow-up. 3.5 years after his last visit, he returned and cytologic examination revealed malignant urothelial cells, while intravenous pyelography disclosed a urinary bladder defect. Cystoscopy showed numerous papillary masses dispersed over the bladder mucosa, which were resected transurethrally. Histopathologic examination revealed TCC grade III, stage A. Tumor cells were immunopositive for beta-HCG and human placental lactogen. 4 transurethral resections of large masses were performed within 2 months. Pulmonary metastases developed and the patient died 4 years after the detection of the urinary bladder tumor.