Table 2.

List of morphological features of primary and metastatic ovarian carcinomas

Favor primary	Favor metastatic	Unhelpful features
smooth capsule	involvement of surface and superficial cortex	gross cysts
evenly distributed cystic and solid areas (no discrete nodularity)	nodular pattern (gross and/or microscopic) including gross mucinous multinodular appearance	gross solid, papillary, hemorrhagic areas
areas of MBT and/or mucinous cystadenoma	areas of MBT and/or mucinous cystadenoma less frequent, commonly associated with high grade nuclear atypia	nature of the content of the cysts
expansile invasion	infiltrative (destructive) invasion	pseudomyxoma ovarii
complex papillary pattern	bilaterality	cribriform, villous, or solid growth
size > 10 cm (>  15 cm)	hilar involvement	goblet cells
associated teratoma or Brenner tumor	single cell invasion	tumor grade
microscopic cystic glands	signet ring cells	focal areas resembling colonic carcinoma
	vascular invasion
mural nodule	microscopic mucus on the surface
unilateral	pseudomyxoma peritonei
low stage	intraperitoneal spread
low age	colloid morphology
	established history of cancer

MBT mucinous borderline tumor