Synchronous Invasive Ductal Carcinoma and Mucosa-Associated Lymphoid Tissue (MALT) Lymphoma of the Breast

We described a rare presentation of synchronous extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue (MALT) lymphoma and invasive ductal carcinoma of the breast. This case highlights that one should keep an open mind to the possibility of synchronous multiple primary neoplasms in patients with carcinoma.