Meningocele:  A protrusion of the meninges of the spinal cord through a defect in the spinal column.
Meningoencephalitis:  An inflammation or infection of the brain and meninges.
Meningoencephalocele:  A protrusion of both the meninges and brain tissue through a skull defect.
Minimally invasive:  A surgical procedure where a small incision is made and instrumentation is used through this incision. More about our minimally invasive neurosurgery program.
MRI (magnetic resonance imaging):  A scanning technique for views of the brain or spinal cord. No radiation is involved, but rather pulsed magnetic waves are used to delineate the structures within the brain.
Myelogram:  An x-ray of the spinal canal following injection of a contrast material into the surrounding cerebrospinal fluid spaces.
Myelomeningocele:  A protrusion of the spinal cord and its coverings through a defect in the vertebral column.
Myelopathy:  Any functional or pathologic disturbance in the spinal cord.
Myopathy:  Any disease of muscle.
Nerve root:  The end of a spinal nerve nearest its attachment to the spinal cord.
Neuralgia:  A paroxysmal pain extending along the course of one or more nerves.
Neurectomy:  Excision of part of a nerve.
Neuritis:  Inflammation of a nerve. May also be used to denote non-inflammatory nerve lesions of the peripheral nervous system.
Neuroblastoma:  A tumor of sympathetic nervous system origin, found mostly in infants and children.
Neurofibroma:  A tumor of the peripheral nerves due to an abnormal collection of fibrous and insulating cells.
Neurofibromatosis:  A familial condition characterized by developmental changes in the nervous system, muscles, and skin, marked by numerous tumors affecting these organ systems. More about neurofibromatosis.
Neurolysis:  Removal of scar or reactive tissue from a nerve or nerve root.
Neuroma:  A tumor or new growth largely made up of nerve fibers and connective tissue.
Neuropathy:  Any functional or pathologic disturbance in the peripheral nervous system. Disorder may be localized secondary to lesion or generalized secondary to medical disorder.
Nucleus:  The soft center of a spinal disc.

Weill Cornell Medicine Brain & Spine Center 525 East 68 Street, Box 99 New York, NY 10065 Phone: 866-426-7787