We report a case of combined noninvasive ductal and lobular carcinoma. The patient was a 54-year-old woman with a breast tumor. The tumor was a palpable movable mass measuring 1 cm in diameter in the AC region of her breast. Mammography, ultrasonography, magnetic resonance imaging, and vacuum-assisted core-needle biopsy were performed. The histopathological diagnosis was intraductal papillary cystic lesion. However, there was also a ductal lesion. We performed lumpectomy, and the diagnosis was combined noninvasive ductal and lobular carcinoma. It was difficult to determine the range of carcinoma, and thus, we performed Bt+Ax. Combined noninvasive ductal and lobular carcinoma is rare. We should study additional cases and develop more adequate treatments.
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