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Endolymphatic hydrops in superior canal dehiscence and large vestibular aqueduct syndromes
Author(s) -
Sone Michihiko,
Yoshida Tadao,
Morimoto Kyoko,
Teranishi Masaaki,
Nakashima Tsutomu,
Naganawa Shinji
Publication year - 2016
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1002/lary.25747
Subject(s) - vestibular aqueduct , medicine , vestibule , endolymphatic hydrops , vestibular system , cochlea , oscillopsia , audiology , vestibular evoked myogenic potential , semicircular canal , hearing loss , audiometry , sensorineural hearing loss , surgery , meniere's disease , vertigo
Objectives/Hypothesis Pathologic third window lesions, such as superior semicircular canal dehiscence syndrome (SCDS) or large vestibular aqueduct syndrome (LVAS), cause several auditory and vestibular symptoms, which might affect perilymphatic pressure and induce endolymphatic hydrops (EH). In this study, the existence of EH in subjects with SCDS or LVAS was investigated using contrast‐enhanced magnetic resonance imaging (MRI). Study Design Case series at university hospital. Methods Seventeen ears from nine subjects who were diagnosed as having SCDS (five ears from three cases) or LVAS (12 ears from six cases) were studied. Ears were evaluated by 3‐T MRI performed 4 hours after intravenous injection of gadodiamide hydrate. Imaging data concerning the degree of EH in the cochlea and the vestibule were compared with clinical symptoms and hearing levels for all ears. Results All ears showed air–bone gaps at low frequencies on pure tone audiometry. None of the subjects with SCDS had episodes of acute sensorineural hearing loss (SNHL) or vestibular symptoms, except for one patient who complained of head vibration induced by loud noise. Conversely, five of six subjects with LVAS had episodes of acute SNHL or vestibular symptoms. Four of five ears with SCDS showed severe EH in the cochlea, and two ears showed mild EH in the vestibule. All ears with LVAS showed mild to severe EH in both the cochlea and vestibule. Conclusions The present study demonstrated the existence of EH in ears with pathologic third window lesions, which might affect patients' auditory or vestibular symptoms. Level of Evidence 4 Laryngoscope , 126:1446–1450, 2016