Squamous cell carcinoma of the breast.
ABSTRACT Pure primary squamous cell carcinoma of the breast is a rare disease, thus strict criteria should be applied when making such a diagnosis. Breast abscesses are a common presentation. We report a case of primary SCC of the breast in a 69-year-old woman in which the initial clinical impression was a breast abscess. She had an incision and drainage, and cytological and histological examination revealed squamous cell carcinoma. A secondary source was excluded and the patient underwent mastectomy, which was followed by a local recurrence in 4 months.