This Nuclear Medicine scan is the optimal way to image the lymphatic system of the body. The lymphatics are a complex network of small vessels, similar in many ways to blood vessels, only instead of being transporting conduits for blood they transport a clear fluid called lymph. Lymph nodes are found at various points along the lymphatic channels. Lymphoscintigraphy demonstrates the lymphatics in various parts of the body, and not only shows the anatomical location and network pattern but also demonstrates the function of the lymphatics. This scan is commonly used to investigate limb swelling and for the diagnosis of lymphoedema.