Cystosarcoma phyllodes is an older terminology for an extremely rare types of breast tumors that now are called Phyllodes tumors or Phylloides tumors. Unlike most types of breast tumors, Phyllodes tumors develop in the stromal (connective) tissue of the breast.
Although Phyllodes tumors usually are benign (i.e., non-cancerous), they occasionally can be malignant (i.e., cancerous). Surgical treatments for benign and malignant Phyllodes tumors are available.
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