Fig. 4

Representative images of ovarian mucinous carcinoma (OMC) with infiltrative invasion and expansile invasion

a OMC with infiltrative invasion was defined as obvious evidence of destructive stromal invasion measuring > 5 mm in the greatest linear extent (x 20). b Stromal invasion was associated with malignant glands, cell nests, and a desmoplastic stromal reaction (x 100). c OMC with expansile invasion was defined as marked glandular crowding with little intervening stroma, creating a labyrinthine appearance with little intervening normal ovarian stroma (x 10). d A cribriform pattern was present (x 100)