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idiopathic retroperitoneal fibrosis

n.
  1. A benign disorder of unknown cause characterized by the proliferation of retroperitoneal connective tissue, usually causing obstruction of the ureters.Ormond's disease
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.