[Urothelium cancer with trophoblastic differentiation. An unusual case of a 77 year old patient].

Urothelium carcinomas with beta HCG positive markers are a rarity in tumour differentiation. Syncytiotrophoblastic and, in a few cases, cytotrophoblastic giant cells are typical for this carcinoma. Such differentiation has an intensified potential for invasiveness and is accompanied by increased angiogenesis. In the present case, the mixture of trophoblastic cells indicates a common stem cell. In comparison with beta HCG negative transitional cell carcinoma, the prognosis is bad for beta HCG positive carcinoma. For this reason, a radical operation should be taken into consideration as early as possible.