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bronchopulmonary sequestration

n.
  1. A congenital anomaly in which a mass of embryonic lung tissue becomes isolated from the rest of the lung with the bronchi in the mass usually being dilated or cystic and unconnected to the bronchial tree.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.