A Case of Breast Cancer with Metastatic Nodules in Additionally Resected Specimens

: A 68-year-old woman who had leftbreastcancer (cT2N0M0, cStage ⅡA)underwentbreast -conserving therapy and sentinel lymph node biopsy. Pathological diagnosis of the resected specimen revealed a 60mm cancer lesion including a 50 mm invasive ductal carcinoma with surrounding ductal carcinoma in situ, although the pre-operative MRI suggested a 30mm invasive cancer. The surgical margin was positive with the exposure of ductal carcinoma in situ. Additional resection was performed with a resection margin of 20mm from the head-side stump of the previous surgery. Pathological diagnosis of the additionally resected specimen revealed a 6mm invasive carcinoma with its exposure on the surface of the specimen around the new surgical stump distant from the initial surgical margin, where no remnant cancer was noted. She underwent left mastectomy. Pathological diagnosis further revealed 7mm and 2mm invasive carcinomas in the remnant breast. The preoperative imaging was reviewed retrospectively, and it was found that identifying the nodules in the remnant breast was quite difficult based on the images, including MRI. We report a case of breast cancer with metastatic nodules in additionally resected specimens.