A Case of a Benign Phyllodes Tumor of the Breast in an 11-year-old Girl

Abstract

Phyllodes tumors in adolescents are rare and it is difficult to preoperatively distinguish them from fibroadenomas, especially juvenile fibroadenomas. So far, tumorectomy has been required for fibroadenomas, and wide local excision for phyllodes tumors. Recently, we have increasingly encountered reports describing that resection for phyllodes tumors do not require margins when the stumps are negative. An 11-year-old girl presented with a left breast lump of 7 cm in size. The features of imaging examinations and pathological findings led to a diagnosis of benign phyllodes tumor rather than juvenile fibroadenoma. Tumorectomy was performed, and the histopathological examination identified benign phyllodes tumor. In this case, we did not perform additional resection, because it was a benign phyllodes tumor and the surgical margin was negative. There have been no signs of recurrence as of 6.5 years after the operation. In the treatment of phyllodes tumors in adolescents, it is necessary to decide therapeutic policy in consideration of cosmetic outcome and functional preservation along with complete resection.