Spinal tumors are growths that develop on the bones and ligaments
of the spine, on the spinal cord, or on nerve roots. These tumors can be
noncancerous (benign) or cancerous (malignant).
Malignant tumors rarely start in the spine. They are usually tumors
that have spread from other parts of the body, particularly the breast,
prostate gland, thyroid gland, or kidney.
WebMD Medical Reference from Healthwise