Abstract
Synchronous occurrence of multiple neoplastic processes is uncommon and the relationship between breast cancer with lymphoproliferative diseases is unusual as well. Furthermore, breast involvement by malignant lymphoma is a rare event and primary breast mucosa-associated lymphoid tissue (MALT) lymphoma is even rarer. We report a patient with synchronous occurrence of malignant lymphoma of MALT type and ductal carcinoma of the breast, presenting as "collision tumor," invading each other and occurring as a single mass in the breast. Involvement of the sentinel lymph node by MALT lymphoma was demonstrated with no evidence of metastatic carcinoma. Staging bone marrow biopsy did not show involvement by malignant lymphoma or carcinoma. Our patient was treated with chemotherapy for the lymphoma. She also received radiotherapy and aromatase inhibitor as adjuvant therapy for the breast carcinoma.
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