Myeloid metaplasia of the breast

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Abstract
The authors report a case of myeloid metaplasia of the breast presenting as a tumor mass with homolateral axillary lymphadenopathy. The lesion was clinically misinterpreted as a breast cancer and developed in an elderly woman 8 years after the diagnosis of primary myelofibrosis was made. Immunohistochemical and ultrastructural studies confirmed the haematopoietic nature of the proliferating cells. The differential diagnosis from other breast lesions is discussed.