plasmacytoma

Medical Dictionary

plasmacytoma plas·ma·cy·to·ma (plāz'mə-sī-tō'mə)
n. plas·ma·cy·to·mas or plas·ma·cy·to·ma·ta (-mə-tə)
A discrete, usually solitary mass of neoplastic plasma cells in bone or in one of various extramedullary sites.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
plasmacytoma

noun
neoplasm of plasma cells (usually in bone marrow) 
WordNet® 3.0, © 2006 by Princeton University.
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