insulitis

[ĭn′sə-lītĭs]
n.
  1. A histologic change in the islets of Langerhans characterized by edema and the infiltration of small numbers of white blood cells.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.