Summary of Intraductal papilloma
Intraductal papillomas of the breast are small benign papillary tumors in the lactiferous ducts of the breast of premenopausal women, and are found just beneath the areola. They are the most common cause of serous or bloody discharge from the female breast, and cause a slightly (1.5-2x) increased risk of developing breast cancer later in life. Histology shows fibrovascular projections lined by epithelial and myoepithelial cells. The condition needs to be differentiated from a papillary carcinoma, which also presents with bloody nipple discharge.