Spine procedures, Revision spinal surgery, Astrocytoma, Acoustic neuroma, Cavernous malformations, Brain tumor, Meningi...oma, Hemorrhage, Chiari malformation, Discitis, Lumbar spondylosis, Lumbar radiculopathy, Subarachnoid hemorrhage, Oligodendroglioma, Sciatica, Movement disorder, Spinal cord injury, Brain lymphoma, Cervical radiculopathy, Intracranial hemorrhage, Subdural hemorrhage, Glioma, Scoliosis, Intracranial venous malformation, Spinal cord tumor, Brain metastasis, Spine deformity, Head and neck cancer, Stroke, Transient ischemic attack, Peripheral neuropathy, Lumbar spinal stenosis, Spinal stenosis, Cervical spinal stenosis, Venous malformation, Vertebral tumor, Hydrocephalus, Glioblastoma multiforme, Spinal cord lymphoma, Ependymoma, Balance problem