E: Glossary

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Edema: An excessive accumulation of fluid in cells, tissues, or body cavities.

Electroencephalography (EEG): The study of the electrical currents set up by brain actions; the record made is called an electroencephalogram.

Electromyography (EMG): A method of recording the electrical currents generated in a muscle during its contraction.

Encephalocele: The herniation of brain meninges through a skull defect.

Endarterectomy: The removal of fatty or cholesterol plaques and calcified deposits from the internal wall of an artery. More about carotid occlusion.

Endoscope: A thin, telescope-like instrument. A video camera attached to the endoscope records images a surgeon can view on a monitor. Specially designed surgical tools enable a surgeon to operate through small incision(s).

Endovascular: Inside a blood vessel, especially a minimally invasive catheter-based approach for the treatment of central nervous system disorders (for example, a cerebral aneurysm).

Ependyma: The membrane that lines the cerebral ventricles of the brain and central canal of the spinal cord.

Ependymoma: A growth in the brain or spinal cord arising from ependymal tissue.

Epidural (extradural): Immediately outside the dura mater.

Epidural hematoma: A blood clot between the dura mater and the inside of the skull.

Epilepsy: A disorder characterized by abnormal electrical discharges in the brain, causing abnormal sensation, movement or level of consciousness. More about epilepsy in adults and epilepsy in children.