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chorioangioma

(kôr′ē-ō-ăn′jē-ōmə)
n.
  1. A benign tumor of placental blood vessels usually of no clinical significance.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.