A type of cancer that begins in plasma cells (white blood cells that produce antibodies). A plasmacytoma may turn into multiple myeloma.
A localized tumor of malignant plasma cells, either in a bone or in the other tissues of the body. If there is only one such area of bone involved it is called solitary plasmacytoma. An area outside of bone may be referred to as extramedullary plasmacytoma.
Single tumor comprised of malignant plasma cells that occurs in bone or soft tissue. Patients with a plasmacytoma may develop myeloma.