Borderline mucinous tumor (ovary)

Case contributed by Dr Alexandra Stanislavsky


Pelvic pain and fullness. Ca125 44

Patient Data

Age: 20 years
Gender: Female

Large multilocular cystic pelvic mass measuring 23.7 x 10.7 x 19.6 cm. Some vascularity is seen in the septa, however no significant solid component is identified.
The left ovary is not identified.

A normal right ovary is seen separate to the mass.

Normal anteverted uterus. Endometrial thickness of 2 mm.
No ascites.

CT confirms the presence of a large multilocular mass occupying the pelvis and mid abdomen. There is no ascites and no evidence of visceral, peritoneal or nodal metastases.

Case Discussion


Large mass with numerous loculations but no solid component or papillary projections.  This appearance is typical for a mucinous borderline tumor - although not pathognomonic and has overlap with both mucinous cystadenomas, as well as malignant lesions e.g. low grade mucinous adenocarcinoma.

Risk stratification:

According to IOTA simple rules, it is an inconclusive lesion, with neither "B" or "M" features present.

ADNEX score: 89% benign

O-RADS Category 4: 10-50% risk of malignancy, recommend management by a gynecologic oncologist.


Borderline mucinous tumor

PlayAdd to Share

Case information

rID: 78228
Published: 5th Jun 2020
Last edited: 6th Jun 2020
System: Gynaecology
Inclusion in quiz mode: Included

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.