The lymphatic system is made up of lymph nodes and lymph vessels (lymphatics) that link the lymph nodes. The nodes harbor a type of white blood cell (lymphocytes) that helps fight infections. When an infection is present, the lymph nodes swell, help proliferate the white blood cells, and try to trap the organisms that are causing the infection. The lymph nodes also function to filter and trap cancer cells. The lymph nodes and vessels are not normally seen on an X-ray , so a contrast material and/or radioisotope (radioactive compound) is injected into the system to visualize it.

Alternative Names

Lymphography; Lymphangiography