To the Editor.—
Primary cutaneous plasmacytoma is so rare that its existence has even been doubted. It is only through correlation with extramedullary plasmacytoma involving other organs that this entity may be better understood. Plasmacytoma, like lymphoma, is a neoplastic disease of the reticuloendothelial system which eventually metastasizes to regional lymph nodes and other organs.1-4 This is the main reason why the cases reported by Hedinger,5 Aragona,6 Volk,7 and Agarwal8 have been denied the title "plasmacytoma cutis."4,9,10In January 1970, we described a primary plasmacytoma cutis of the right pectoral region which later metastasized to the right axillary nodes.10 The relationship between the primary and the metastatic lesion was clear cut and highly significant. As a follow up on this case, we wish to report that a recurrence of the growth occurred in the right axilla eight months after the primary-node excision.
Mikhail GK. Primary Cutaneous Plasmacytoma. Arch Dermatol. 1973;107(6):917. doi:10.1001/archderm.1973.01620210077023