Leiomyomas of the ovary.

Two cases of ovarian leiomyoma as casual findings in oophorectomy specimens are reported. Both were small (1.5 and 1.0 cm), one had leiomyoblastomatous and symplastic features, and the other was associated with an adjoining multilocular mucinous cystadenoma and atypical hyperplasia in the endometrium. Both coexisted with uterine leiomyomas, which they resemble morphologically. Distinction from thecoma-fibroma was made by the immunohistochemical demonstration of desmin and characteristic electronmicroscopic features of smooth muscle.