Cystosarcoma phylloides presenting as massive unilateral breast hypertrophy in an adolescent

A 14-year-old girl presented with unilateral massive breast enlargement while the opposite breast had minimal development. A 565 gm tumor, benign cystosarcoma phylloides, was removed by wide local excision. The literature regarding the controversial tumor is reviewed. Methods of treatment for each category of cystosarcoma phylloides, based upon morphological criteria, are outlined and the prognosis discussed. The special problem of cystosarcoma phylloides in the adolescent is reviewed and treatment recommended.