A 55-year-old woman comes to the clinic due to a left breast mass. She first noticed it a few months ago, and since then, it has progressively grown in size. Medical history is significant for
diabetes mellitus type 2, for which she takes
metformin. She does not
smoke, drink
alcohol or use illicit drugs. Vitals are within normal limits. On physical examination, a smooth, well-defined, firm and mobile mass is noted in the left breast. There is no associated pain, and the rest of the physical examination is within normal limits. Biopsy is performed, and the results are shown below:
Reproduced from: Wikimedia Commons
This patient’s lesion most likely arises from which of the following areas?
