Conformal radiation therapy represents a new challenge for radiation oncologists. It offers the prospect of either increasing the radiation dose to target tissues while delivering a similar dose to organs at risk, or reducing the dose to organs at risk while maintaining the dose to target tissues. First, lymph node areas at risk are established using the available data from pathological examination of surgical specimens and/or pattern of locoregional relapse. Then, based on a three-dimensional description of the anatomical regions where the areas at risk are located, guidelines for the delineation of the clinical target volumes are proposed. The data presented should enable the reader to make appropriate decisions regarding the selection and delineation of the target volumes when confronted with the most frequent tumor types and sites.The book will contribute to paving the way for more effective radiation oncology in the twenty-first century.

1 The Lymphatic System.- 2 Imaging the Lymph Nodes: CT, MRI, and PET.- 3 Selection and Delineation of Lymph Node Target Volumes in Head and Neck Conformal and Intensity Modulated Radiation Therapy.- 4 Lung Cancer.- 5 Esophageal Tumors.- 6 Target Volume Selection and Delineation in Breast Cancer Conformal Radiotherapy.- 7 CTV for Lymphatics in Prostate Adenocarcinoma, an Anatomical Description and a Clinical Discussion.- 8 Intensity-Modulated Radiation Therapy (IMRT) for Lymph Node Metastases in Bladder Cancer.- 9 Gynecologic Tumors.- 10 Rectal and Anal Cancers in Conformal Radiotherapy Planning: Selection and Delineation of Lymph Node Areas Tumors.- 11 Target Description for Radiotherapy of Soft Tissue Sarcoma.- 12 Role of Radiotherapy in Lymphomas.- List of Contributors.