MONDO_0002489 (malignant breast phyllodes tumor) is a phyllodes tumor of the breast characterized by infiltrative margins and a sarcomatous stromal component. The sarcomatous stroma usually displays features of fibrosarcoma. Liposarcomatous, osteosarcomatous, or rhabdomyosarcomatous elements may also be present. Also known as: breast phyllodes tumor, malignant, malignant breast phyllodes neoplasm, malignant cystosarcoma phyllodes of breast, malignant cystosarcoma phyllodes of the breast, malignant mammary phyllodes neoplasm, malignant mammary phyllodes tumor, malignant mammary phyllodes tumour, malignant phyllodes breast neoplasm.