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Medical Term:

aneurysmal bone cyst


a solitary benign osteolytic lesion expanding a long bone or within a vertebra, consisting of blood-filled spaces, and separated by fibrous tissue containing multinucleated giant cells; may cause swelling, pain, and tenderness and compromise the structural integrity of the involved bone.

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.