Plasmacytoma

There are three distinct groups of plasmacytoma defined by the International Myeloma Working Group:

Solitary bone plasmacytoma (SBP), extramedullary plasmacytoma (EP), and multiple solitary plasmacytomas that are either primary or recurrent. Among the three, SPB is the most common and occurs as lytic lesions within the axial skeleton 2).

Plasmacytoma is rare that responsible for only 5% of plasma cell neoplasms.

Due to their cellular similarity, plasmacytomas have to be differentiated from multiple myeloma. For SPB and EP the distinction is the presence of only one lesion (either in bone or soft tissue), normal bone marrow (<5% plasma cells), normal skeletal survey, absent or low paraprotein and no end organ damage.


1)
Grogan TM, Muller-Hermelink HK, Van CB, Harris NL, Kyle RA. Plasm cell neoplasms. In: Jaffe ES, Harris NL, Stein H, Vardiman JW, editors. World health organization classification of tumours. Pathology and genetics of tumours of haematopoietic and lymphoid tissues. Lyon: IARC Press; 2001. pp. 142–156.
2)
Dimopoulos MA, Moulopoulos LA, Maniatis A, Alexanian R. Solitary plasmacytoma of bone and asymptomatic multiple myeloma. Blood. 2000;96:2037–2044.
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