system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 29-year-old woman comes to the physician for evaluation of a mass in the left breast that she first noticed 2 weeks ago. During this period, the mass has not increased in size and the patient has had no pain. Three months ago, she hit her left chest against the closet door, which was painful for a day. Menses occurs at regular 28-day intervals and last for 5 days with moderate flow. Her last menstrual period was 3 weeks ago. Physical examination shows dense breasts and a 2.5-cm well-defined, rubbery, mobile mass that is nontender in the upper outer quadrant of the left breast. There is no axillary adenopathy. Which of the following is the most likely diagnosis?
assistant
Fibroadenoma