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A spinal tumor is an abnormal growth of cells located either within the spinal cord itself or, much more often, in its surrounding membranes and tissues. The spinal cord, which along with the brain comprises the central nervous system, is a bundle of nerve cells encased in a protective membrane that travels almost the entire length of the spine, connecting the brain to the nerves in the rest of the body. Tumors affecting the spinal cord are uncommon; they may be either benign or malignant. However, even benign tumors can compress the spinal cord, leading to irreversible paralysis (see Spinal Cord Trauma). They can also impinge upon nerves as they leave the spinal cord.Malignant tumors rarely originate in the spinal cord itself; most often, cancer compressing the spinal cord has spread from elsewhere in the body to the bones of the spine (vertebrae) or has originated in the vertebrae. Benign tumors usually grow slowly, but malignant tumors may increase in size in a matter of days; symptoms may be limited to back pain or may include numbness, loss of sensation, and weakness, generally beginning in the legs. Both benign and malignant tumors can damage the spinal cord by interrupting its blood supply. After diagnosis of a malignant tumor, rapid treatment is necessary to limit damage and to prevent irreversible paraplegia.
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Content excerpted from Johns Hopkins Symptoms and Remedies: The Complete Home Medical Reference.