A Case of a Phyllodes Tumor Coexisted with Invasive Lobular Carcinoma in the Ipsilateral Breast

Abstract

Phyllodes tumors sometimes coexist with breast carcinoma. Here we report a case of invasive lobular carcinoma with a borderline phyllodes tumor in the ipsilateral breast. The case involved a 67-year-old woman who presented with a rapidly growing mass in the right breast, which had been recognized since half a year before the first visit. A dome-shaped tumor with 7 cm in diameter was observed in the CD area of the right breast. Ultrasound examination showed a round, well defined, hypo- to isoechoic tumor with heterogenous internal echoes. Core needle biopsy revealed a benign or borderline phyllodes tumor, so we performed right total mastectomy and level I lymph node dissection. On pathological diagnosis, invasive lobular carcinoma coexisted adjacent to the borderline phyllodes tumor of 9 cm in diameter. When a phyllodes tumor is accompanied by breast carcinoma, additional treatment according to the coexisting breast carcinoma is required. In this case, level I lymph node dissection was performed at the same time, and lymph node metastasis was found to be negative. We decided that additional surgery was not required. She has been on adjuvant endocrine therapy in the same manner as breast carcinomas.