[Endometrial tissue in myometrium vessels. Two cases report and literature review]

Endometrial tissue in the myometrium vessels space, whit no relation to menstrual period, is a rarely reported event. It is unknown if it is part of the natural history of ectopic localization of endometrial tissue or it is related to more or less aggressive behavior of endometriosis. This paper reports two cases: a 35- and 51-year-old women. The first one made suspect a clear cells adenocarcinoma undiagnosed before hysterectomy, because there were no endometrial glands in the myometrium vessels space, but only nest of stromal cells isolated, simulating thrombus of an invasive neoplasm. Since a wrong diagnosis affects the integral treatment of patients, differential diagnosis must be established in order to increase certainty.