<prompt> All of the following are true about Borderline tumors except :10 of all epithelial tumours are borderline.They have a good prognosis.Metastases are commonAbsence of stromal invasion  <response>: The characteristic feature of borderline tumor of ovary are: - 10 of all epithelial tumours are borderline. - metastasis are uncommon but can rarely occur. - the chief characteristic feature is absence of stromal invasion. - confined to ovary for long time and have very good prognosis. Reference: Textbook of Gynaecology, Sheila balakrishnan, 2nd edition, pg no:272,273 p 