<unk> s of the breast are relatively common benign lesions with an incidence of approximately 2-3% in humans.  They are the most common cause of bloody nipple discharge in women age 20-40 and generally do not show up on mammography due to their small size, so the next step in treatment would be a galactogram to guide the subsequent biopsy.The masses are often too small to be palpated or felt. A galactogram is therefore necessary to rule out the lesion.
Excision is sometimes performed as the method of treatment.
Intraductal papilloma
Fibroadenoma
Inverted papilloma
Mammary adenosis
Mammary ductal carcinoma
Carcinoma in situ
Sister Mary Joseph nodule
Duct ectasia of breast