摘要: Biphasic lesions of the breast are characterized by integral epithelial and stromal components. Determination composition facilitates diagnosis. Lesions with predominantly specialized stroma include fibroadenoma phyllodes tumor, a mixture nonspecialized variant, hamartoma, pseudoangiomatous hyperplasia. Diagnostic difficulty may be encountered when biphasic lesion has cellular stroma, raising differential diagnosis tumor. Distinctive histologic features tumor architectural frond formation, cytological atypia, mitotic activity, irregular gland dilatation, morphologic heterogeneity. These contrast those other lesions.