====== Solitary plasmacytoma ====== There are three distinct groups of [[plasmacytoma]] defined by the International Myeloma Working Group: [[Solitary bone plasmacytoma]]. [[Extramedullary plasmacytoma]]. Multiple solitary plasmacytomas that are either primary or recurrent. Among the three, [[Solitary bone plasmacytoma]] is the most common and occurs as lytic lesions within the axial skeleton ((Dimopoulos MA, Moulopoulos LA, Maniatis A, Alexanian R. Solitary plasmacytoma of bone and asymptomatic multiple myeloma. Blood. 2000;96:2037–2044.)).