Primary non-Hodgkin's lymphoma of the breast: mammography, ultrasound, MRI and pathologic findings.

Primary non-Hodgkin's lymphoma of the breast (PBNHL) is uncommon. There have been only a few reports of breast lymphoma in the radiology literature. In this case report, we describe mammographic, sonographic and MRI findings, in addition to surgical and histopathologic findings, in a patient with PBNHL. In particular, the diffusion-weighted imaging sequence of MRI in a patient with PBNHL has yet to be reported in the published literature. Mammographic and sonographic imaging findings are limited in the diagnosis of this rare disease. MRI may play an important role in the assessment of multicentric lesions and staging of mammary malignancies preoperation. MRI may also be useful in the follow-up of breast lymphoma patients to monitor response to chemotherapy and radiotherapy and to diagnose disease recurrence.