Table 2

Features favouring primary ovarian origin of mucinous tumours

UnilateralBilateral metastatic tumours may not cause symmetrical or even comparable ovarian enlargement
Maximum tumour diameter >12 cmCut-off points of 10 and 13 cm have been published; it has also been suggested that tumours 10–15 cm should be considered indeterminate
Smooth outer surface
Associated benign, borderline and malignant appearing areasMaturation of ovarian metastases may result in a deceptively similar gradation of features
Complex papillary architecture
Association with other background changes:
 Endometriosis (seromucinous tumours)
 Brenner tumour
 Mature cystic teratoma
 Sertoli–Leydig cell tumour