plasmacytoma

[plăz′mə-sī-tōmə]
n. pl. plas•ma•cy•to•mas
  1. 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.