plasma cell neoplasm plasmacytoma https://www.malacards.org/card/plasmacytoma MESH:D010954 anaplastic plasmacytoma MONDO:0005615 anaplastic skeletal plasmacytoma (type) extramedullary anaplastic plasmacytoma (type) solitary plasmacytoma MEDGEN:18506 UMLS:C0032131 Plasmacytoma is a localized mass of neoplastic monoclonal plasma cells that represents approximately 5% of all plasma cell neoplasms. There are two separate entities: primary plasmacytoma of the bone and extramedullary plasmacytoma of the soft tissues. Of the extramedullary plasmacytomas, 80% occur in the head and neck, usually in the upper respiratory tract. The median age at diagnosis is 50 years and the male to female ratio is 3:1. Long-term survival is possible following local radiotherapy, particularly for soft tissue presentations. icd11.foundation:1811140613 DOID:3721 SCTID:415112005 ICDO:9731/3 anaplastic solitary extramedullary plasmacytoma of the cecum (type) Orphanet:86855 plasmacytoma NCIT:C9349 EFO:0006738 ICD9:238.6 GARD:0013446 MedDRA:10035484 alternative definition: A type of cancer that begins in plasma cells (white blood cells that produce antibodies). A plasmacytoma may turn into multiple myeloma.