We report on a women with metaplastic carcinoma of the right breast. After diagnosis she had a simple mastectomy operation. Pathological investigations were carried out on mastectomy material. Immunohistochemical analyses were performed. Bizarre, malignant giant cells and diffuse inflammatory reactions were predominantly noted. Sarcomatous metaplasia and rare squamous metaplasia were also seen. There was not any area of classic intraductal, invasive ductal, lobular or papillary carcinoma. The patient is still alive and well for more than five years. This uncommon case is described and discussed, and the related literature is reviewed.

        Key words: breast, metaplastic carcinoma, giant cell, sarcomatous metaplasia