Merck Manual

Please confirm that you are a health care professional

honeypot link

Phyllodes Tumor

(Cystosarcoma Phyllodes)


Mary Ann Kosir

, MD, Wayne State University School of Medicine

Last full review/revision Sep 2020| Content last modified Sep 2020
Click here for Patient Education

Phyllodes tumor is a nonepithelial breast tumor that may be benign or malignant.

Phyllodes tumors are frequently large (4 to 5 cm) at diagnosis. About half are malignant, accounting for < 1% of breast cancers. Between 20% and 35% of these tumors recur locally, and distant metastases occur in 10 to 20% of patients.

Usual treatment of a phyllodes tumor is wide excision, but a mastectomy may be more appropriate if the mass is large or histology suggests cancer. Radiation therapy may be recommended in some cases.

Prognosis is good unless metastases (usually pulmonary) are present.

Click here for Patient Education
NOTE: This is the Professional Version. CONSUMERS: Click here for the Consumer Version
Professionals also read

Also of Interest