Deformity of the breast in a premenopausal woman

A 48-year-old premenopausal woman, who has had one pregnancy and has delivered once, presents with a 15-month history of left breast deformity. The patient began having pain in the region 2 months ago. A review of systems is negative for weight loss, fever, or nipple discharge. Her medical history is otherwise unremarkable, and her family history is noncontributory. Physical ...