Abstract: The aim was to analyze the histological types of ovarian tumor in our hospital. The pathological data of ovarian tumor during Jun,1982 to Dec, 1999 were collected according to the WHO classification for ovarian tumors. Som e cases which were unsure in the previous pathological diagnosis were reconfirmed according to the WHO classification. 3 582 cases of ovarian tum ors were registered during 18 years in our hospit al. There were 3 068 (85.65%)cases of benign tumors, 419(11.70%)cases of m alignant tumors and 95(2.65%)cases of borderline tumors. Classified by histologi cal type, there were 1 362(38.02%) cases of epithelial tumors, 1 908(53. 27 %) cases of germ cell tumors, 280(7.81 %) cases of sex cord-stromal tumors, 18(0.50%) cases of secondary tumors and 14(0.40%) cases of non-specific soft tissue neoplasm. Among the 514 cases of malignant tumors, epithelial type accounted fo r 66.73%, sex cord-stromal tumors was 16.95%, and germ cell tumors, 13.03% . 71.87 % of malignant germ cell tumor occurred in women younger than 20. In averag e, malignant ovarian epithelial tumor occursat (47.8±11.0) years old. The inciden ce of ovarian germ cell tumors is higher than epithelial. But in malignant tumor s the incidence of common epithelial tumors is especially higher than other types of malignant tumors. The most frequent malignant tumor which occ urs in women younger than 20 is germ cell tumor.

Key words: ovarian tumor, histology classification