A 28-yeаr-оld wоmаn presents fоr her аnnual physical examination. She describes a painless lump in her left breast detected during breast self-examination two weeks ago. She has no previous history of breast lumps and considers herself generally healthy. She takes no medication and does not smoke tobacco or drink alcohol. The patient has no personal or family history of breast cancer. Physical examination reveals a firm 1 to 2 cm mass in the lateral aspect of her left breast. However, no associated skin changes, nipple discharge, or retraction are found. No axillary adenopathy is present. What is the most appropriate next step in the workup of this patient?