[Breast plasmacytoma. Apropos of a case. Review of the literature].

The authors report a new case of a bilateral localisation of a mammary plasmacytoma, as an extension of the multiple myeloma, in a 41-year-old woman. There are 19 cases known. In 2/3 of the cases, the breast localisation was an extension of the multiple myeloma, as the new case reported; the others cases were considered as a solitary plasmacytoma. The authors describe its diagnostic imaging appearance.