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Fibroadenoma (A): US shows an elliptic mass with horizontal orientation, slightly isoechoic echotexture, sharp rounded margins with a complete thin echogenic capsule, unaltered US beam transmission beyond the lesion, subtle edge shadowing on both sides of the nodule. Complex fibroadenoma (B): US shows a lesion of heterogeneous echotexture with the presence of microcysts (apocrine metaplasia) or small hyperechoic areas (sclerosing adenosis).
