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pigmented villonodular synovitis

(vĭl′ō-nŏjə-lər)
n.
  1. Diffuse outgrowths of the synovial membrane of a joint, usually the knee.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.