hyperlucent lung

[hī′pər-lōōsənt]
n.
  1. The radiographic finding that one lung is less dense than the other normal lung, as from infection or a bronchial foreign body.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.