J Korean Neurol Assoc.  1989 Jun;7(1):63-69.

Brainstem Auditory Evoked Potentials in Acoustic Neuromas and other Cerebellopontine Angle Tumors

• Lee SS
• Kim JW
• Lee KW
• Lee SB
• Myung HJ
• Kim JS

Abstract

Brainstem auditory evoked potentials(BAEP) and clinical features were studied in 12 patients with acoustic neuromas and in10 patients with non-acoustic cerebellopontine angle(CPA) tumors. In acoustic tumor group, BAEP fundings were characterized by poor wave formation in 3 cases, well-defined wave I with indistinct or absent following waves in 6 cases, and prolonged interpeak latencies(lPL) in 3 cases on the affected sides. In non-acoustic tumor group poor wave formation in 1 case, well-defined wave I with absent following waves in 2 cases, and prolonged IPL in 7 cases were found on the affected sides. In each group, IPL prolongation was observed in 5 cases on the unaffected sides. BAEP findings tend to be more often abnormal in acoustic tumors than in non-acoustic CPA tumors Chief complaints were auditory symptoms(hearing loss or tinnitus) in 10 headache in 1 and dizziness in 1 in acoustic tumor group: auditory symptoms in 3, headache in 2, facial sensory change in 2, facial pain in 1, ataxia in 1 and vertigo in 1 in non-acoustic CPA tumor group Cranial nerve involvement was VIII in 12, V un 9, IX or X in 4, VII in 2. VI in 1 and XII in 1 in acoustic tumor group: VIII in 8, V in 9, VII in 5, IX or X in 3, II in 1. VI in 1 and XII in 1 in non- acoustic CPA tumor group. Increased DTR in 2 and cerebellar dysfunction in 9 were found in acoustic tumor group and in 3, 7 respectively in non-acoustic CPA tumor group. There was electrophysiological improvement in postoperative BAEPs in 3 cases. The postoperative BAEP study mightbhe the good tool of follow-up.

MeSH Terms

Acoustics*
Ataxia
Brain Stem*
Cerebellar Diseases
Cerebellopontine Angle*
Cranial Nerves
Dizziness
Evoked Potentials, Auditory, Brain Stem*
Facial Pain
Financial Management
Follow-Up Studies
Headache
Humans
Neuroma, Acoustic*
United Nations
Vertigo