We describe the MRI and US features of two patients with endometrial stroma
l sarcoma of the uterus. Both lesions appeared as voluminous id masses with
in an expanded endometrial on both US and MRI. They had mixed echotexture a
nd heterogenous signal intensity on both T1- and T2-weighted sequences. T2-
weighted images were most helpful in detecting the endometrial nature of th
e disease and its relationships with surrounding myometrium.