The authors present 6 cases of endolymphatic myosis of endometrial stroma. All patients with known evolutions were alive between 4 months and 17 years after treatment in spite of 2 relapses. Pathological aspect of this rare lesion is characterized by penetration of stromal endometrial tumoral tissue without glands in both lymphatic and venous myonatrial vessels. In certain cases, the presence of polypes of this structure allows the diagnostic by dilatation and analogy Progestine induces a predecidual transformation of this lesion. The myosis belongs to the endometrial stromal sarcoma. The lesion is however different by its low mitotic index.