[A case of giant phyllodes tumor with special reference to its process of enlargement]

A phyllodes tumor of the breast can grow into an extremely large oncoides occasionally and be a cause of poor prognosis without adequate treatment in some cases. A case of giant phyllodes tumor which is thought to be one of the largest and heaviest among reported cases in Japan was treated in our clinic. The process of enlargement of the tumor and the treatment of this patient are reported.