Loupe images showing cross-sections of the tumor. a At the top of the section the epidermis of the accessory nipple can be seen. At the bottom of the section some ducts and atrophic lobules are visible. b A low-power view showing the architecture with a complex proliferation of ductules around dilated lactiferous ducts. The lesion is relatively well-circumscribed but has no capsules [×20]. c A higher magnification view demonstrating ductules with internal micropapillary proliferations [×100]. d Immunohistochemical staining for p63 to assist the recognition of the two cell layers and demonstrate the participation of myoepithelial cells [×100].