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[The breast phyllodes tumor: surgical therapy following histological transformation. Case report].

The Authors report a clinical case of mammary phyllodes tumor recurrence; characterized by the histological transformation of the recurrence respect to primary tumor. PT are 0.3-1% of all mammary neoplasia. They are classified with Tavassoli's criteria (1999). The surgical treatment of PT is the wide excision (WE). Local recurrences are detected in about 20% of patients undergone to surgery. Surgical therapy of recurrences depends on the histological grade of primary lesion. Authors believe it is necessary to perform simple mastectomy when high grade PT recurrences are detected and when histological transformation of the lesion changes from low grade to high grade.