With the increasing incidence of adenocarcinoma of the distal esophagus/GE junction, there is an increasing need for optimization of radiation therapy in the treatments for this disease. In the setting of advanced technologies, accurately delineating the gross as well as clinical targets at risk is more important than ever before since respiratory associated tumor motion can be significant. Moreover, a thorough understanding of which nodal stations will be encompassed in surgical lymphadenectomy specimens is important. This course will integrate a surgical oncologist with one of the largest US experiences in robotic esophagectomy to teach the students about anatomy, extent of tissue resected, and special concerns about postoperative morbidity that relate to radiation treatment planning. The radiation oncologist will go over how to contour the target volumes and how to account for respiratory as well as organ motion since the upper stomach is often in the field. A highlight of this course will be the CTV at risk depending on where the primary esophageal tumor is located. At the conclusion of this activity, the learner will be able to do the following: 1. Evaluate respiratory associated esophageal tumor motion. 2. Identify CTV expansions that account for gastric extension. 3. Identify elective nodal stations at risk based on tumor location. 4. Identify extent of surgical lymphadenectomy that would influence contouring.