[Hormonal dependence of vesicouterine fistulas].

Vesicouterine fistulas are more and more frequently reported. This paper reviews available data suggesting the role of the endometrium in the fistula's formation. At least a proportion of these fistulas fulfil the criteria of external endometriosis. Conservative management by means of hormonal treatment should be considered before surgical repair. We also present a new clinical classification of this disorder, based on the routes of menstrual flow: type I--with menouria, type II--with dual flow via both the bladder and vagina, and type III--with normal vaginal menses.