**4. Ovarian endometrioid carcinomas (OECs)**

Endometrioid ovarian carcinomas account for 10–15% of epithelial ovarian tumours are correlated with favourable prognosis and can be found in women ageing 30–80 years [79]. They arise mainly from endometriosis lesions and less frequently from benign or borderline endometrioid ovarian neoplasms, such as adenofibromas or endometrioid borderline tumours [80]. Atypical endometriosis is the precursor lesion for 40% of OECs. Risk factors for OECs are endometriosis lesions, Lynch syndrome, hereditary breast and ovarian cancer syndrome, late menopause and postmenopausal hormone therapy [80, 81].
