title: Malignant cystosarcoma phyllodes tumor of the breast mainly composed of chondrosarcoma: a case report.
abstract: Sarcoma of the breast is a very rare occurrence. We experienced a patient with malignant phyllodes tumor, in which a chondrosarcomatous element constituted 90% of the tumor volume. That bone or cartilage may be present in mammary neoplasms has been known for a long time. Most mammary tumors with areas of chondroid metaplasia show a benign histologic appearance. Cystosarcoma phyllodes displaying a chondrosarcomatous element is very rare. The results obtained by echographic and pathologic examinations strongly suggest that the chondrosarcomatous element originates from the fibrous stroma.
authors.affiliation: Department of Pathology, Toshiba Hospital, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Iihara
authors.forename: R
authors.initials: R
authors.lastname: Machinami
authors.forename: S
authors.initials: S
authors.lastname: Kubota
authors.forename: S
authors.initials: S
authors.lastname: Itoyama
authors.forename: A
authors.initials: A
authors.lastname: Sato
mesh_terms: D001943:Breast Neoplasms / Q000473:pathology*; D002813:Chondrosarcoma / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D003557:Phyllodes Tumor / Q000473:pathology*