Phyllodes tumors are a rare type of breast growth. Less than 1% of all breast tumors are this type. Most are not cancer, called benign. But about 25% of these tumors are cancerous (or malignant).

only 15 cases of such tumors have been reported in the English literature, variously described as cystadenoma, cystomyoma, low-grade phyllodes tumor, benign mesenchymoma, adenomyosis, and ...