著者

松本 真吏子 星野 知之 木倉 幹乃 黄川田 啓子 黄川田 徹

出版者

Japan Otological Society

雑誌

Otology Japan (ISSN:09172025)

巻号頁・発行日

vol.15, no.5, pp.633-638, 2005-12-25 (Released:2011-06-17)

参考文献数

8

被引用文献数

1

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Objective: To examine measurements of the vestibular aqueduct on axial CT figures and to examine the cases with borderline EVA.Design: The width of the vestibular aqueduct was measured in two places, the midpoint of the duct and the external aperture in the posterior cranial fossa. Criteria was as follow: Enlargement ;≥1.5mm at the midpoint, ≥2mm at the aperture, Borderline; 1-1. 4mm at the midpoint, 1.5-1.9mm at the aperture.Participants: 345 cases with CT scans of the temporal bones taken during July 2003 to June 2004 in the secondary ENT referral center. Those Patients include sensorinearal, mixed or conductive deafness, vertigo, ear infections and other ear diseases.Result: Enlarged vestibular aqueduct was found in 10 ears with sensorinearal deafness (SD) and 2 ears without SD. Borderline measurements were found in 19 ears with SD and 33 ears without SD. The enlarged midpoint measurement was not seen in the cases without SD.Conclusions: More than 1. 5mm of the definition for the enlargement at the midpoint of the vestibular aqueduct seemed to be appropriate in the clinical situation. The measurement at the midpoint of the duct is more reliable than at the external aperture. The conductive component in EVA Syndrome with mixed hearing loss is present only at the lower frequencies (250, 500Hz), not at the middle and higer frequencies. Long-term follow-up of hearing should be done in the borderline cases with check-up of PDS gene anomaly if necessary.