<prompt> Which is the nerve sheath tumor according to WHO?SchwannomaParagangliomaMedulloblastomaAstrocytoma  <response>: Ans. is a i.e., Schwanomma Schwannomas are benign tumors of the nerve sheath. Schwannomas can arise from any peripheral nerve containing Schwann cells, including cranial nerves. Although schwannomas can arise from any nerve in the body, the most common locations include the head, arms, legs and trunk. The eighth cranial nerve is the most susceptible to schwannomas. Bilateral schwannomas of the eighth cranial nerve indicate the presence of type 2 neurofibromatosis. Other benign nerve sheath tumors are neurofibromas and hemangiopericytoma. 