Snapshot A 26-year-old woman presents to the gynecology clinic with a mass in the left breast. She discovered this mass while showering. Her last menstrual period was 10 days ago. There is no family history of breast cancer. On physical exam, you palpate a 3 cm, firm, non-tender mass in the upper lateral quadrant of the left breast. The mass is smooth, well-circumscribed, and mobile. There are no skin changes, nipple discharge, or axillary lymphadenopathy. Ultrasound of the breast was carried out as shown. Introduction Clinical definition login to view 1 more bullet Associated conditions login to view 2 more bullets Prognosis login to view 5 more bullets Epidemiology Incidence login to view 3 more bullets Demographics login to view 2 more bullets Risk factors login to view 2 more bullets Etiology Pathophysiology login to view 4 more bullets Presentation Physical exam login to view 6 more bullets Imaging Ultrasonography login to view 5 more bullets Studies Fine needle aspiration or core biopsy of the mass to confirm diagnosis and/or exclude malignancy Histology login to view 4 more bullets Any enlarging mass warrants excision Differential Fibrocystic disease login to view 2 more bullets Breast cyst Galactocele login to view 2 more bullets Treatment Conservative login to view 4 more bullets Operative login to view 11 more bullets Complications May be a risk factor for future cancer login to view 2 more bullets