CASE STUDY
AUDIO-VESTIBULAR FINDINGS IN AN ADULT WITH ARNOLD–CHIARI MALFORMATION
Prashanth Prabhu 1, A-F  
,   Anu Sara Anish 1, A-F  
,   Devika Vijayan 1, A-F  
,   Annika Mariam Shiju 1, A-F  
,   Shanthala S P 1, A-C,F  
,   Ramadevi Sreenivas 1, A,D-F  
 
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Department of Audiology, All India Institute of Speech and Hearing, India
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article;
CORRESPONDING AUTHOR
Prashanth Prabhu   

Department of Audiology, All India Institute of Speech and Hearing, Naimisham Campus, Manasagangothri, 570006, Mysore, India
Submission date: 2020-05-26
Final revision date: 2020-09-08
Acceptance date: 2020-10-08
Publication date: 2020-12-31
 
J Hear Sci 2020;10(4):85–90
 
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ABSTRACT
Background:
Arnold–Chiari malformation is defined as a congenital neuroanatomic deformity of the craniocervical junction, which is characterized by herniation of contents from the posterior cranial fossa through the foramen magnum into the cervical spinal canal. There is limited literature on audiological and vestibular evaluation on individuals with Arnold–Chiari malformation. Thus, the present study reports the results of a detailed audio-vestibular evaluation in an adult female diagnosed with Arnold–Chiari malformation.

Case report:
A detailed audio-vestibular evaluation was carried out in an adult female diagnosed with Arnold–Chiari malformation. Pure tone audiometry, immittance evaluation, otoacoustic emissions, auditory brainstem response (ABR), cervical vestibular evoked myogenic potential (cVEMP), ocular vestibular evoked myogenic potential (oVEMP), and video head impulse test (vHIT) were recorded, and the results were analyzed. The results of the study showed an abnormal prolongation of inter-peak latencies in the ABR, which was seen in both ears. Also, cVEMP and oVEMP was absent in both ears. The results suggest possible compression of the cerebellar tonsils on the cochlear and vestibular nuclei.

Conclusions:
The study suggests that individuals with Arnold–Chiari malformation should undergo a detailed audio-vestibular evaluation to understand the pathophysiology of the disorder, which can guide further management.