[A Case of Patient with Breast Cancer Diagnosed with an Intramammary Lymph Node Metastasis after Surgery].

We report a case of breast cancer with intramammary lymph node metastasis found after surgery without sentinel lymph node metastasis. A 30's female came to our hospital for a detailed examination after undergoing breast cancer screening. Mammography and ultrasonography showed a mass in the upper-outer quadrant of her right breast. With a core needle biopsy, a diagnosis of invasive breast cancer was achieved. A right lumpectomy and sentinel lymph node biopsy was carried out. The sentinel lymph nodes were confirmed to be negative for metastasis during the surgery. Pathological findings revealed invasive lobular carcinoma in the upper-outer quadrant and a positive intramammary lymph node. We decided to perform no additional axillary lymph node dissection considering the result of ACOSOG Z0011. The patient is currently undergoing adjuvant therapy and is under observation.