[A Case of Local Recurrence after Conserving Therapy for Occult Breast Cancer with Immediate Breast Reconstruction].

We report the case of a 70-year-oldwoman with local recurrence of occult breast cancer after conserving therapy. Breast cancer metastasis to an axillary lymph node was suspected when she was 62-years-old. Even with mammography, ultrasound sonography, positron emission tomography/computedtomography, andmagnetic resonance imaging, the primary disease lesion could not be identified. She underwent axillary dissection, and received 5 years of endocrine therapy. Eight years after surgery, a new ipsilateral breast tumor was detectedusing ultrasoundsonography andvacuum assistedbiopsy, confirmedas invasive carcinoma. This time the patient had no distant metastases; therefore, she was diagnosed with local recurrence, and mastectomy with immediate breast reconstruction was performed. Breast conserving surgery aims to reduce the psychological burden on the patient but must be closely followed-up in case of local recurrence. Any incidences of local recurrence can also be treatedusing breast reconstruction surgery.