Fig. 1From: Spectrum of Imaging Findings in Paget’s Disease of the Breast—A Pictorial ReviewLine diagram showing Etiopathogenesis theories. a Epidermotropic theory: Malignant cells from DCIS migrate through the lactiferous ducts to reach the nipple and areola. b Intraepidermal transformation theory: Paget cells arise from the epidermis of nipple by degeneration of existing cells or by in-situ transformationBack to article page