[Primary non-Hodgkin lymphomas of the breast. Focus].

Although very rare (0.12 to 1.1% of all breast tumours), primary non-Hodgkin's lymphomas of the breast need to be distinguished from the group of malignant epithelial tumours, as the staging and therapeutic modalities are different, corresponding to those applied to lymphomas in general. In the majority of cases, the current techniques of aspiration cytology, needle or surgical biopsy, immunohistochemistry allow the diagnosis and typing according to the usual histological classifications.