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Spine radiosurgery. Target definition (vertebral body), radiotherapy isodose lines (upper right) and dose distribution (below). The axial and sagittal views illustrate “dose-shaping” promoted by IMRT, with sparing of the spinal cord and esophagus. [Male, 62 years old, metastatic melanoma of the spine, stable lesion, ECOG 0, treated with SR via 18 Gy delivered in a single fraction. The distance between the GTV (gross target volume) and the medulla is approximately 2 mm].
