Ovarian borderline mucinous cystadenoma

Last revised by Dr Jeremy Jones on 20 Sep 2021

Ovarian borderline mucinous cystadenomas are a subtype of ovarian mucinous tumors and, as the name stands, are intermediate between mucinous cystadenomas and mucinous cystadenocarcinomas.

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 3
  • 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.

They are non-invasive tumors of low malignant potential, with survival rates reported as high as 99% 2.​

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Cases and figures

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