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Metaplastic carcinoma of the breast is a rare and heterogeneous group of malignancies that accounts for less than 1% of all breast cancers. The histogenesis remains unknown. Clinical and radiological appearances are not specific. The treatment is based on surgery associated to radiation therapy and chemotherapy. There is no place for hormone therapy. The prognosis is poor. The diagnosis is based onmorphological and immunochemical findings. We report five cases of metaplastic carcinoma of the breast originating from an anatomopapthology laboratory, with a literature review. [ABSTRACT FROM AUTHOR]

The article presents a case study of a 29-year-old woman who presented for treatment of axillary accessory breast. She had a left breast axillary tail lump increasing slowly in size over 3 years; the mass was surgicall excised, on cutting however multiple cysts oozing serous-brownish fluid were seen. The patient was diagnosed with apocrine cystadenoma of the axillary tail of the breast; complete excision cured the patient.