
A 24-year-old woman presents to her primary care provider with a mass in her left breast. Examination confirms a 2.2-cm mass in the upper outer quadrant, with a single mobile axillary node that is firm to palpation.

A 24-year-old woman presents to her primary care provider with a mass in her left breast. Examination confirms a 2.2-cm mass in the upper outer quadrant, with a single mobile axillary node that is firm to palpation.