[Electronystagmographic changes in patients with posterior cranial fossa tumors].
Findings of electronystagmography in 30 patients with posterior cranial fossa tumor were analysed. Of the 23 cases of CPA tumor, size varied between 0.7-5.0 cm, the ENG showed: (1) The nystagmus occurred in 83% of patients. (2) In ODT, overshoots was showed in 22% of patients. (3) ETT showed type III or IV curves in 55.6% of patients. (4) OKP test decreased in 59% of patients. (5) Caloric test showed canal paresis in 85% of the patients. (6) Abnormal visual suppression test occurred in 60% of patients. (7) Abnormal ABR was found in 89% of patients. We also found that tumor larger than 2.5 cm presented a central type nystagmus (Bruns nystagmus) and involvement of the eye movement system. The electronystagmographic changes of the tumors of cerebellum (3 cases) and brain stem (4 cases) was discussed.
First Hospital of Beijing Medical University.
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Zhao
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Li
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Cao
D000293:Adolescent; D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000503:physiopathology; D001933:Brain Stem; D002528:Cerebellar Neoplasms / Q000503:physiopathology*; D002530:Cerebellopontine Angle; D002648:Child; D003388:Cranial Fossa, Posterior; D004584:Electronystagmography; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000503:physiopathology*