A Prospective Study Using Implanted Fiducial Markers to Assess Treatment Accuracy and Esophageal Toxicity in Spinal Stereotactic Body Radiation Therapy

Group 1 and 2: Standard doses of radiation therapy to the normal esophagus while treating the tumor. Up to 2 groups of 10 participants enrolled.

Group 3 and 4: Higher dose of radiation to esophagus than group before it, if no intolerable side effects were seen. 2 groups of 10 participants enrolled in the second part of study. Only participants who will receive a single spinal SBRT treatment are eligible for second part of study.

4 gold seeds implanted into bones of spine: 2 gold seeds above and 2 gold seeds below the area of tumor to be treated.

Completion of questionnaire before radiation treatment starts, and 1 time a week for the next 4 weeks. It should take about 10 minutes to complete.