[Hodgkin lymphoma and target definition guidelines].

Treatment for stage I and II Hodgkin lymphoma is based on a combination of chemotherapy and radiotherapy, with a high successful cure rate. Now, the aim is to decrease toxicity rates. Positron-emission tomography scan is recommended as pretreatment baseline and is very useful to define precisely target volumes for planning radiation therapy. Based on these changes were developed guidelines for modern radiation therapy called involved node and « involved site ».