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Table 1 Histological classification of ovarian tumours adapted from WHO

From: MR imaging of ovarian masses: classification and differential diagnosis

Primary tumours (95 %) Surface epithelial-stromal tumours (65 %) 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 (15 %) teratoma biphasic or triphasic mature
immature
monodermal strumaovarii
dysgerminoma
Yolk sac tumour
choriocarcinoma
embrionalcell carcinoma
Sex cord-stromal (10 %) granulosa cell adult
juvenile
thecoma-fibroma group fibroma
techoma
sclerosing stromal tumour
unclassified (fibrothecoma)
Sertoli-Leydigcell
steroidcell
Miscellaneous (5 %) small cell carcinoma, gestational choriocarcinoma, others
Secondary tumours (5 %) stomach, colon, breast, lung, contralateral ovary