Table 1 Histological classification of ovarian tumours adapted from WHO
From: MR imaging of ovarian masses: classification and differential diagnosis
Primary tumours (95Â %) | Surface epithelial-stromal tumours (65Â %) | serous | benign | cystadenoma, papillarycystadenoma adenofibroma/cystadenofibroma |
borderline | papillary cystic tumour, surface papillary tumour, adenofibroma/cystadenofibroma | |||
malignant | adenocarcinoma, surfacepapillary adenocarcinoma, adenocarcinomafibroma | |||
mucinous | benign | cystadenoma, adenofibroma/cystadenofibroma | ||
borderline | intestinal type, endocervical-like | |||
malignant | adenocarcinoma, adenocarcinomafibroma | |||
endometrioid | ||||
clear cell | ||||
transitional cell (Brenner) | ||||
undifferentiated and unclassified | ||||
Germ cell tumours (15Â %) | teratoma | biphasic or triphasic | mature | |
immature | ||||
monodermal | strumaovarii | |||
dysgerminoma | ||||
Yolk sac tumour | ||||
choriocarcinoma | ||||
embrionalcell carcinoma | ||||
Sex cord-stromal (10Â %) | granulosa cell | adult | ||
juvenile | ||||
thecoma-fibroma group | fibroma | |||
techoma | ||||
sclerosing stromal tumour | ||||
unclassified (fibrothecoma) | ||||
Sertoli-Leydigcell | ||||
steroidcell | ||||
Miscellaneous (5Â %) | small cell carcinoma, gestational choriocarcinoma, others | |||
Secondary tumours (5Â %) | stomach, colon, breast, lung, contralateral ovary | |||