Morphological characteristics of the phyllodes tumours of the breast

: Tumor phyllodes arise from stroma component of the terminal ductulo-lobular unit (TDLU). Stromal and epithelial proliferation are present in the same time. The stromal component grow th more intensive and dominante over the epithelial component. Clinically, macroscopically and microscopically tumor phyllode look like fibroadenoma which is more common lesion than tumor phyllodes. The differentiation between these two lession is important because the fibroadenoma almost never reccur bur the reccurence is ofthen in tumor phyllodes especially in incomplete excision. The fibroadenoma growth is never over 3 cm, but the growth of tumor phyllodes is sometimes over the 20 cm. The clinica differentiation in smaller lesions is very hard, macroscopical differentiation is a litle better, but the final diagnosis is microscopical. Biological behavior is not in the correlation with histological picture. Histologically, we can differentiate benign, borderline and malignant tumor phyllodes.