ABSTRACT
Breast lymphomas are quite rare extranodal lymphomas. While they represent approximately 0.04-0.5% of the primary cancers of the breast, their prevalence is 0.38-0.7% among all lymphomas. Primary breast lymphomas are usually of B-cell phenotype. T-cell phenotype has been published in the literature as case reports. In this report, a 22-year-old female patient with breast mass is presented. Upon detection of primary T-cell lymphoma of the breast on biopsy, 4 courses of CHOP followed by radiotherapy was administered to the patient. The patient, who entered remission after treatment is under follow-up for approximately a year and is still in remission. A patient presenting with breast mass may have lymphoma and differentiation with breast masses should be made.