Primary breast diffuse large B-cell lymphoma in a male.

A 74-year-old male with a mass in the right breast visited the Department of Breast and Endocrine Surgery in November 20XX. Core needle biopsy was performed. Pathological diagnosis was diffuse large B-cell lymphoma. The Ann Arbor clinical stage was IIA, and international prognostic index was low-intermediate. Six courses of rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone and four courses of intrathecal chemotherapy were administered, and the patient achieved complete remission.