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micrometastasis

(mī′krō-mə-tăs′tə-sĭs)
n.
  1. The spread of cancer cells from the primary site with the secondary tumors too small to be clinically detected.
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Related formsmi′cro•met′a•stat′ic (-mĕt′ə-stăt′ĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.