Figure 16a. Endometriomas. (a) Axial T2-weighted image shows a large right ovarian endometrioma (left arrow) with layering of blood within the endometrioma. A smaller left ovarian endometrioma is also present (right arrow). Arrowhead = right iliac lymphocele. (b) Axial T1-weighted image shows high signal intensity within both endometriomas. (c) Axial T1-weighted image obtained with fat saturation shows that blood is present in both endometriomas. The smaller left-sided endometrioma was noted before trachelectomy, but the larger right-sided endometrioma developed in the postoperative period.