An otherwise healthy 43-year-old woman presents to your clinic for a left breast mass. Six months ago, she underwent a bilateral breast magnetic resonance imaging (MRI) after watching a television program on breast cancer prevention. An ultrasound-guided biopsy of a 1.5 cm massconfirmed, at the time, that she had fibroadenoma. The follow-up ultrasound now reveals a mass measuring 1.7 cm. Which one of the following is the best next step in the management of this patient?
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