Plasmacytoma of the breast. A report of two cases diagnosed by aspiration biopsy.

BACKGROUND

Extramedullary plasmacytoma of the breast is an uncommon neoplasm, occurring either as a solitary tumor or as evidence of disseminated multiple myeloma.

CASE

Two cases of plasmacytoma of the breast were diagnosed by fine needle aspiration cytology. Aspiration smears showed a dispersed population of plasmacytoid cells with eccentric nuclei, abundant cytoplasm and the characteristic paranuclear hof.

CONCLUSION

The clinical, cytologic and immunophenotypic features of plasmacytoma are characteristic, and the importance of distinguishing these neoplasms from primary mammary tumors is important to avoid unnecessary surgery.