MG, US, and post-surgical pathology results from a 46-year-old patient with a lump in her left breast. (A) MG of the left breast could not identify the location of the lesions. (B) MG of the right breast of the same patient. (C) US showed an oval mass in her left breast. (D) Post-surgical pathological examination revealed adenosis of the left breast complicated by fibroadenoma (HE staining, ×100). This represents a typical example of misdiagnosed lesion sites by MG compared with pathological examination.