Trial for Salvage Re-Irradiation of Metastatic Spine Lesions Using Single-Fraction Stereotactic Radiosurgery

Patients enrolled on this study will be registered into a dose tier and undergo 1 session of image-guided SRS using techniques previously. Three escalating SRS spinal cord/cauda maximum dose (Dmax) levels (14 Gy, 16 Gy, and 17 Gy) will be evaluated to determine the safety of this approach. A minimum of three patients will be treated per dose tier. Toxicity based on NCI CTCAE (v4). Post treatment followup at 2 and 4 months (+/- 2 weeks) post-treatment, at 6 months (+/- 4 weeks) and then every 3 months until 2 years (± 4 weeks). Followup schedule based on last day of treatment. No schedule adjustments based on early or delayed visits.