extramedullary plasmacytoma https://www.malacards.org/card/extramedullary_plasmacytoma ICD10CM:C90.2 EP ICD9:203.80 MONDO:0002754 ONCOTREE:EP plasmacytoma, extramedullary DOID:3720 MEDGEN:75843 SCTID:188718006 icd11.foundation:246947217 NCIT:C4002 A plasma cell neoplasm arising at an extraosseous site. There is no involvement of the bone marrow. It most frequently involves the oropharynx, nasopharynx, sinuses, and larynx. Other sites of involvement include the gastrointestinal tract, central nervous system, breast, skin, lymph nodes, and bladder. A minority of patients have a monoclonal gammopathy. Treatment includes radiation therapy. Progression to plasma cell myeloma occurs in a minority of patients. extraosseous plasmacytoma GARD:0023233 ICDO:9734/3 extramedullary plasmacytoma UMLS:C0278619 extramedullary plasmacytoma (clinical) plasmacytoma, extramedullary (not occurring in bone) plasmacytoma