Spinal cord tumors are similar to any other type of tumor. Its cause is unknown but can occur as a primary tumor or as a result of the spread of cancer from another area. Lumbar vertebral tumors can cause lower back pain, loss of sensation, muscle weakness and spasms through the legs and feet. Like other tumors, these must be treated quickly and effectively so they do not spread to other areas. Surgery, radiation or chemotherapy is often necessary to remove the tumor.