Breast plasmocytoma is infrequent and in most of the cases is associated to multiple myeloma. We describe a 42 year old woman with a diagnosis of solitary plasmocytoma of the neck associated to multiple myeloma that went into remission and eleven months later she presented a right breast lump which was confirmed by core biopsy and immunohistochemical study to be a plasmocytoma. Sometimes differential diagnosis is difficult and should be performed in primary and secondary breast tumours. The election treatment is radiotherapy if there are not manifestations of a subyacent sistemic disease.
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