Three hundred and five patients undergoing exploratory laparotomy by adnexial tumors in our institution from January 1987 to October 1992 were studied. The results of the frozen sections vs permanent sections were compared. The diagnosis was concordant in 98.7% of the cases. Sensitivity was 96.9% and specificity was 99.6%. These results consagrate frozen sections as an accuracy and efficient intraoperative diagnostic form in the ovary tumoral pathology.