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(A) Cervical spine lateral view of a patient with renal cell cancer C2 metastasis. Pre-SRS kyphotic deformity is present. (B) Pre-SRS MRI axial view showing the tumor mass infiltrating the C2 vertebral body. (C) Pre-SRS CT axial image. Spinal instability neoplastic score was 10. Whole vertebral body involvement rate was 67%, but the vertebral body osteolysis rate was 90%. (D) Post-SRS cervical spine lateral view. A C2 compression fracture developed and cervical kyphosis progressed.
