"The exact pathogenesis is not well known. They are most commonly composed of ovarian teratoma (typically mature cystic teratoma of the ovary 5) and an ovarian cystadenoma or ovarian cystadenocarcinoma (typically mucinous 5) while other histologic combinations are much less common (e.g. teratoma and granulosa cell tumour, cystadenocarcinoma and sarcoma)."
"The exact pathogenesis is not well known. They are most commonly composed of ovarian teratoma (typically mature cystic teratoma of the ovary 5) and an ovarian cystadenoma or ovarian cystadenocarcinoma (typically mucinous 5) while other histologic combinations are much less common (e.g. teratoma and granulosa cell tumour, cystadenocarcinoma and sarcoma)."