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Medical Definition of Malignancy

Malignancy: A tumor that is malignant (cancerous), that can invade and destroy nearby tissue, and that may spread (metastasize) to other parts of the body.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=4259
Last Editorial Review: 5/13/2016

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