Figure 3.

Microscopic perivascular epithelioid cell (PEC) nodules in the endometrium of an endometriotic cyst and uterine cavity (x400). (A) Microscopic PEC nodules in the endometriotic cyst (arrowhead) (hematoxylin-eosin). (B) HMB-45 immunostaining highlighting the microscopic PEC nodules in the endometriotic cyst. (C) Microscopic PEC nodules in the basal layer of the endometrium of the uterine cavity (arrowhead) (hematoxylin-eosin). (D) HMB-45 immunostaining highlighting the microscopic PEC nodules in the endometrium of the uterine cavity.