Seven patients with lymphoma presenting as a breast mass are described. Four of them fulfilled the criteria for primary lymphoma of the breast, and three had evidence of secondary lymphoma of the breast. Two patients were diagnosed with stage IAE disease, and both did well with local treatment with or without chemotherapy. Two patients were diagnosed with stage IIAE disease; both had distant failure without systemic chemotherapy. Although local treatment is curative in a subset of stage IAE disease, combination chemotherapy followed by local radiation is a safer approach. For stage IIAE disease, combination chemotherapy and local radiation therapy should be considered.