[Is a hydatid cyst always an unimportant "secondary finding"? (author's transl)].

527 small parovarial cysts, so-called hydatid cysts, were extirpated as "secondary findings" and examined histologically. 43 cysts (8,16%) were found with a definitely increased proliferation of the epithelium. In 12 cases (2,2%) so-called borderline tumors were detected, and a cystadenocarcinoma was identified in one. The results justify the demand to remove every small cystic or solid tumor in the range of the serous membrane of the small pelvis, and to let follow a routine histological examination.