label: Breast Non-Hodgkin Lymphoma
label_lc: breast non-hodgkin lymphoma
description: A non-Hodgkin lymphoma that arises from the breast.  There is no history of extramammary breast non-Hodgkin lymphoma and ipsilateral axillary lymph node involvement does not exclude the diagnosis of primary breast non-Hodgkin lymphoma.  Most patients present with a painless breast lump.  The vast majority of cases are B-cell non-Hodgkin lymphomas.  Diffuse large B-cell lymphoma, follicular lymphoma, and extranodal marginal zone B-cell lymphoma of mucosa associated lymphoid tissue are the most common types of primary non-Hodgkin lymphoma of the breast.