blue dome cyst

n.

A benign retention cyst of the mammary gland in fibrocystic disease, containing a light yellow fluid that gives the cyst a blue color when seen through the surrounding tissue.
One of a number of small dark-blue nodules or cysts in the vaginal fornix caused by retained menstrual blood in endometriosis affecting this region.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.