A 70-year-old female has unrelenting lower back pain and severe left anterior thigh pain. She has hip flexion weakness on the left that is limiting her ambulation. A representative image from her abdominal CT (Figure A) as well as a sagittal MRI of her spine (Figure B) is shown below. Nonoperative management has failed. She undergoes a biopsy of her spinal lesion, which is depicted in Figure C. What is the next appropriate step in management?