Multiple myelom B lenfosit hücre kaynakli monoklonal immünproliferatif plazma hücre neoplazisidir. Ekstramedüller plazmasitom ise kemik disinda yer alan bir plazma hücre neoplazmi olup primer veya multipl myelom gibi bir baska plazma hücre tümörüne sekonder olarak görülebilir. Sekonder ekstramedüller plazmasitomalar genellikle hastaligin ilerlemis evrelerinde saptanip genelde aerodigestif traktusta görülür. Biz de multiple myelomlu genç bir hastada mideyi tutan sekonder ekstrameduller plazmasitom olgusunu sunmayi uygun bulduk.
Multiple myeloma is a monoclonal, immunoproliferative plasma-cell neoplasm of the B lymphoid cells. Extramedullary plasmacytoma is a type of plasma-cell neoplasm in tissues other than bone that can present as a primary tumor or secondary to another plasma-cell neoplasm, such as multiple myeloma. Secondary extramedullary plasmacytoma is usually noted in the advanced stages of the disease, mostly involving the aerodigestive tract. We report a case of secondary extramedullary plasmacytoma involving the stomach in a young patient with multiple myeloma.