Extramammary cystosarcoma phyllodes with bilateral breast involvement.

A 30-year-old woman presented with breast masses. One of the breast masses was clinically suggestive of cystosarcoma phyllodes. Excision of the breast masses revealed bilateral cystosarcoma phyllodes. A few weeks later another lump appeared in the left groin, and this on excision was found to be cystosarcoma phyllodes at an aberrant site. We consider it a unique clinical presentation of cystosarcoma phyllodes.