<unk> s are a rare form of cancer. SPB is the most common form of the disease and accounts for 3-5% of all plasma cell malignancies. The median age at diagnosis for all<unk> s is 55. Both SPB and extramedullary<unk>  are more prevalent in males; with a 2:1 male to female ratio for SPB and a 3:1 ratio for extramedullary<unk> .
Plasmacytoma
Astrocytoma
Oligoastrocytoma
Retinoblastoma
Histiocytoma
Osteoblastoma
Pineocytoma
Ameloblastoma