pathologic retraction ring

n.
  1. A constriction of the junction between the thinned lower uterine segment and the thick retracted upper uterine segment caused by obstructed labor; a sign of impending rupture of the uterus.Bandl's ring
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.