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Granular cell tumor of the breast.

Three cases of granular cell tumor of the breast are reported. Granular cell tumor of the breast is a rare benign tumor with a malignant appearance both clinically, radiologically and macroscopically. The cytology is quite characteristic although the tumor clinically often resembles a carcinoma. Frozen section can be misinterpreted, unnecessary mastectomy or axillary dissection can be prevented by careful cytological examination.