Ovarian tumor is one of the most common tumors of the female generative system. Little progress has been made in identifying precursory or in situ stages of these lesions. The 5-year survival rate for all stages is still 35-38%—little better than 35 years ago.
Epethelial tumors account for more than 50~70% of all primary ovarian neoplasia and more than 85%-90% of ovarian malignant tumors.
Ovarian germ cell tumors account for 20%-40% of ovarian tumors. They include dysgerminoma, embryonal carcinoma, teratoma, endodermal sinus tumour, choriocarcinoma , and so on.
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