The spine is made up of a series of connected bones called "vertebrae." In about 5% of the adult population, there is a developmental crack in one of the vertebrae, usually at the point at which the lower (lumbar) part of the spine joins the tailbone (sacrum).
Spine tumors may arise from any of the structures of the spine or the spinal column. They may arise in the cervical (neck), thoracic (mid-back) or lumbosacral (low back) regions.