TY - JOUR T1 - Primary breast diffuse large B cell lymphoma JF - BMJ Case Reports JO - BMJ Case Reports DO - 10.1136/bcr-2022-250478 VL - 15 IS - 6 SP - e250478 AU - Mengni Guo AU - Jieying Liu AU - Richard Gilmore AU - Gang Gary Tian Y1 - 2022/06/01 UR - http://casereports.bmj.com/content/15/6/e250478.abstract N2 - Primary breast lymphoma (PBL) is an uncommon type of breast malignancy. Its clinical presentation and radiographic findings are non-specific and overlap with breast carcinoma. The treatment of PBL differs significantly from breast carcinomas. Here we present a middle-aged woman who presented with an enlarging palpable right breast mass. Mammogram showed breast imaging-reporting and data system 4 findings. Breast mass biopsy pathology confirmed diffuse large B cell lymphoma. Although uncommon, clinicians should be cognisant of the possibility of PBL when patients present with a breast mass. Accurate diagnosis is essential to avoid unnecessary mastectomies. ER -