The authors studied at the "Centre Anticancéreux de Rennes" the value of fine needle aspiration cytology in the valuation of recurrences in breast cancers. The cytologic procedures were made on breast scars. The cytologic investigation interested 32 cases of carcinoma recurrences. The high rate of correct cytology diagnosis and the very low of wrong results prove the value and interest of the fine needle aspiration cytology for recurrences in breast cancers.