A 65-year-old woman is found to have a 1-cm mass in the upper outer quadrant of the left breast. The most likely cause is
The location of the mass in the upper outer quadrant and the patient's age of 65 years suggest that the breast lesion is a carcinoma. A breast mass in a postmenopausal patient is most often a carcinoma.
Fibrocystic disease.
Acute mastitis.
Fibroadenoma.
Carcinoma.
Breast