A histiocytoid (epithelioid) vascular tumor of the ovary: occurrence within a benign cystic teratoma.

This report describes the case of a 22-yr-old woman with benign cystic teratomas of both ovaries. One of the teratomas contained a histiocytoid (epithelioid) vascular tumor. The lesion was composed of closely arranged, variably canalized, nests and cords of vacuolated, histiocytoid endothelial cells. Nuclear morphology was relatively uniform, but four to six mitotic figures were found per ten high-power fields. Stromal inflammatory cells were notably sparse. Intravascular growth was absent. The patient remained well 30 mo after surgery. The authors review the literature concerning vascular tumors of the ovary and comment on histiocytoid vascular lesions in general.