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November 1983

Auditory Evoked Potentials in Gliomas of the Brain Stem

Author Affiliations

Box 435 Letterman Army Medical Center Presidio of San Francisco, CA 94129

Arch Neurol. 1983;40(12):769-771. doi:10.1001/archneur.1983.04050110087020

To the Editor.  —Brain-stem auditory evoked potentials (BAEPs) play a significant role in evaluating auditory pathways and give the clinician an objective assay of the integrity of brain-stem auditory function. The test is often used as a screening tool for patients whose clinical picture is suggestive of structural abnormalities of the posterior fossa. Abnormalities may be produced by demyelinative disease, vascular disease, trauma, or tumors.The test is extremely sensitive in detecting gliomas of the brain stem.1 Patients with such gliomas and normal BAEPs have not been described.2 We describe two patients with brain-stem gliomas and normal BAEPs. In one of them, test results became abnormal as the disease progressed.

Report of Cases.—Case 1.  —A 30-year-old man was admitted to the hospital with a one-month history of right-sided facial numbness that progressed to include paresthesia of the right uppper extremity (RUE).

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