among 172 cases confirmed as malignant ovarian tumours , 145 ( 84 % ) were tumours of germ cell origin ( 54 dysgerminomas , 36 malignant teratomas , 26 endodermal sinus tumours , 4 embryonal carcinomas , 2 pure choriocarcinomas , 20 mixed germ cell neoplasms , 3 gonadoblastomas ) , 13 ( 8 % ) were epithelial carcinomas ( 3 serous or undifferentiated , 10 mucinous ) , 9 ( 5 % ) were sex-cord stromal tumours ( 3 granulosa cell , 3 sertoli-leydig , 3 unclassified ) and 5 ( 3 % ) were other miscellaneous tumour types .
C0014145
endodermal sinus tumours
C2981607
tumour types