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aneurysmal bone cyst

n.
  1. A solitary benign lesion in a long bone or vertebra, consisting of blood-filled spaces separated by fibrous tissue and causing swelling, pain, and tenderness.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.