Management of breast mass J Clin Pract. This type of imaging involves exposing the breasts to a small amount of ionizing radiation to obtain pictures of the inside of the breasts. Independent risk factor of benign and malignant breast lesion. Fibroadenomas usually form during menarche 15 —25 years of agea time at which lobular structures are added to the ductal system of the breast Fig. As fibroadenomas are benign breast lesions, it could be argued that they should not be excised and can be expected to regress spontaneously. Fine needle aspiration FNA has Management of breast mass a popular method in the evaluation of breast masses.