The first successful resection of a spinal cord tumor was performed by Victor Horsley in 1887 (Stein and McCormick, 1996). The diagnosis and treatment of intramedullary spinal cord tumors was first described in detail by Elsberg in 1925 (Stein and McCormick, 1996), and Greenwood reported the first large modern series in 1967. Since then, numerous radiographic, microsurgical, and electrophysiolo...