Figure 1.

Serous borderline tumor/non-invasive low-grade serous carcinoma (SBT/niLGSC) with co-existing mesonephric-like adenocarcinoma (MLA) (case 1). Microscopic examination of the right ovary revealed a conventional type-SBT/atypical proliferative serous tumor (SBT/APST, 75%, A) with focal cribriform variant-SBT/niLGSC (20%, B and C). Towards the ovarian surface there was invasive MLA (5%, D). The tumor cells contained scant eosinophilic cytoplasm, vesicular nuclei with nuclear overlap, irregular nuclear membrane and inconspicuous to variably prominent nucleoli (E). Metastatic MLA (right) with adjacent invasive implants/invasive LGSC component (left) was present in the omentum (F).