Brenner tumor

[brĕnər]
n.
  1. A rare benign neoplasm of the ovary consisting primarily of fibrous tissue with nests of cells resembling transitional type epithelium and glandlike structures containing mucin.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.