Tumor of cranial and spinal nerves

Tumor of cranial and spinal nerves (Orphanet code 252057) is a broad category encompassing neoplasms that arise from the cranial nerves (the twelve pairs of nerves originating from the brain) and the spinal nerve roots or peripheral spinal nerves. These tumors most commonly include schwannomas (also called neurilemmomas), neurofibromas, and malignant peripheral nerve sheath tumors (MPNSTs). They develop from the nerve sheath cells, particularly Schwann cells, that surround and support nerve fibers. The nervous system is the primary body system affected, though secondary effects on surrounding structures — including the brain, spinal cord, and adjacent soft tissues — can occur depending on tumor location and size. Clinical features vary widely based on the specific nerve involved and the tumor type. Common symptoms include pain along the affected nerve distribution, progressive neurological deficits such as numbness, weakness, or loss of specific cranial nerve functions (e.g., hearing loss with vestibular schwannoma, facial weakness with facial nerve tumors), and in spinal cases, radiculopathy or myelopathy with sensory and motor disturbances. Some tumors may be discovered incidentally. Cranial nerve tumors most frequently affect the vestibulocochlear nerve (cranial nerve VIII), while spinal nerve tumors can occur at any vertebral level. These tumors may occur sporadically or in the context of genetic predisposition syndromes such as neurofibromatosis type 1 (NF1), neurofibromatosis type 2 (NF2), or schwannomatosis. Treatment depends on tumor type, location, and growth behavior. Surgical resection is the primary therapeutic approach for symptomatic or growing tumors. Stereotactic radiosurgery is an alternative for certain cranial nerve tumors, particularly vestibular schwannomas. For malignant peripheral nerve sheath tumors, a combination of surgery, radiation therapy, and sometimes chemotherapy may be employed. Observation with serial imaging is appropriate for small, asymptomatic, or slow-growing lesions.

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