An 80-year-old woman had a 6-month history of a palpable mass in the left breast. On physical examination, there was a soft, nontender movable nodule in the left upper inner quadrant. No skin change was visible over the palpable nodule.Mammography showed a 1.7 cm sized, well-circumscribed lobular isodense nodule in the left upper inner breast palpable site (Fig. 1A, B). No evidence of associated calcification was detected. This nodule was assessed as Breast Imaging Reporting and Data System (BI-RADS) category 0, and breast sonography was recommended. Sonography revealed a 1.7 cm sized, well circumscribed lobular hypoechoic nodule in the upper inner quadrant of the left breast, subcutaneous fat layer (Fig. 1C). This nodule was categorized as BI-RADS category 2. A core needle biopsy was performed at the request of the patient because it was palpable.