Phyllodes tumour of the breast is a rare fibroepithelial neoplasm accounting for less than 1% of all mammary tumours, usually presenting in adult females (most frequently between the ages of 35-55 years), ranging from benign to malignant and often presenting with well circumscribed mobile masses that grow rapidly and sometimes with additional non-specific symptoms such as dilated skin veins, nipple retraction, skin ulcers, palpable axillary lymphadenopathy or blue discoloration of the skin. [from
SNOMEDCT_US]