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paradoxical embolism

n.
  1. The obstruction of a systemic artery by an embolus that originates in the venous system and reaches the arterial system through a septal defect or an open oval foramen of the heart.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.