myofibrosis

[mī′ō-fī-brōsĭs]
n.
  1. Chronic myositis with diffuse hyperplasia of the interstitial connective tissue pressing upon and causing atrophy of the muscular tissue.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.