microaneurysm

[mī′krō-ănyə-rĭz′əm]
n.
  1. A focal dilation of the venous end of retinal capillaries occurring in diabetes mellitus, retinal vein obstruction, and absolute glaucoma.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.