ovarian borderline mucinous cystadenoma
They account for ~ 10-15% of all ovarian mucinous tumors.
They are microscopically characterized by cytologic atypia and epithelial stratification, but stromal invasion is absent. They can show identical gross features to those of mucinous cystadenomas.
They are at least two recognized subtypes:
- intestinal type - commonest by far
- Mullerian (endocervical-like) type
They have a multilocular appearance at MR imaging and can be indistinguishable from a simple mucinous cystadenoma of the ovary. Loculi are often small, arranged back-to-back, and variable in number. Contrast-enhanced images are essential to distinguish septal wall thickness from back-to-back small cysts.
Treatment and prognosis
They are non-invasive tumors of low malignant potential, with survival rates reported as high as 99% .