[Leiomyosarcoma of the bladder: apropos of 2 cases].

The authors report two cases of bladder leiomyosarcoma, an extremely rare invasive bladder tumour, with a very poor prognosis due to very early local invasion. The definitive diagnosis can only be established by histological examination. The treatment modalities for this histological type of bladder tumour have not been standardized and remain controversial. However, the treatment of choice appears to be radical prostatocystectomy preceded by neoadjuvant chemotherapy when compatible with the patient's general state.