Palpable left breast nodule. Mammography and ultrasound inconclusive.
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MRI showed several features of a benign lesion: Sharp margins, lobulation/septation, centrifugal enhancement, gradual enhancement over time, and hyperintense T2 signal. Excisional biopsy yielded a fibroadenoma.
Fibroadenoma, a common benign breast lesion, results from excess proliferation of connective tissue and characteristically contain both stromal and epithelial cells.
The majority of fibroadenomas show slow initial contrast enhancement followed by a persistent delayed phase (type I enhancement curve).