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sinus histiocytosis with massive lymphadenopathy

n.
  1. A chronic disease that occurs in children and is characterized by massive painless cervical lymphadenopathy that is the result of distension of the lymphatic sinuses by macrophages containing ingested lymphocytes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.