6)
A 28-year-old woman presents with a history of breast lumps that developed 3 months into her lactation and that have persisted for more than 9 months. On clinical examination, bilateral lobulated, partly mobile, firm breast lumps are present. A breast ultrasound study was performed, which revealed thick-walled cystic areas that contained mixed echogenic lesions. The diagnosis of galactocele was suspected, but a large dominant lesion in the right breast (shown) raised sufficient clinical concern for a malignancy that a breast magnetic resonance imaging (MRI) study was obtained. Which of the following are predisposing factors for galactocele formation?
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