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pathologic retraction ring
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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.