Cyst wall shows partial lining by stratified squamous epithelium with related sebaceous glands and some hair follicles. There are islands of bony tissue , mature smooth muscles and mature adipose tissue. No evidence of immature elements. No evidence of malignancy.
Left ovarian cyst.
Cystic lesion 7.5x5.5x4 cm, cut section is unilocular and full of greasy material containing hairs. Inner surface shows a whitish elevation 3.5x3 cm with yellowish fatty cut section. Ovarian capsule is intact.
Lt ovarian cystectomy: