Ovary, mucinous borderline tumour

Mucinous borderline tumour, also "atypical proliferative mucinous tumour" generally presents as an isolated large ovarian mass. In the absence of areas diagnostic for carcinoma, the prognosis is excellent; however, extensive sampling of the lesion (e.g., 1 to 2 sections per cm of largest tumour dimension) is needed. The tumour usually consists of multiple mucin-containing cysts lined by gastric/intestinal type columnar cells with varying degrees of tufting and stratification.