ABSTRACT
Although the two groups of tumors differ with respect to histogenesis, biology, treatment and prognosis, they are both considered in this chapter because they often present to the physician with similar symptoms. Moreover, neither group is restricted to cranial nerves or the base of the skull. Nerve sheath tumors can arise anywhere in the body and are particularly common along spinal roots. Most of the tumors that affect the base of the skull can also
affect the calvarium or other bones. Nevertheless, cranial nerves are frequent targets, and this chapter is a convenient place to discuss the tumors as a group.
