Breast cancer is the most common malignancy in women and accounts for 22.5% of all malignant neoplasms. One of the most common complications after breast cancer treatment is lymphedema. Various instrumental methods are used for accurate diagnosis and monitoring of treatment effectiveness for this side effect. This review examines the principles, capabilities and clinical applications of these methods in diagnosis and monitoring of lymphedema, as well as their role in selecting the optimal treatment strategy.

Keywords. breast cancer, lymphedema, diagnosis