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para-aortic body

(păr′ə-ā-ôrtĭk)
n.
  1. A small mass of chromaffin tissue found near the sympathetic ganglia along the abdominal aorta.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.