Contralateral Axillary Lymph Node Metastasis in a Patient with Relapsed Breast Cancer: Locoregional Event or Distant Metastasis Disease?

Introduction: Contralateral axillary lymph node metastasis (CAM) is a rare clinical condition in patients with breast cancer. It can be explained from hematogenous spread from the original primary tumor (stage IV) to aberrant regional lymphatic drainage to the contralateral axilla. However, according to the current clinical guidelines, regardless of its origin, CAM is considered as metastatic disease.