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| Analysis of the relationship between large vestibular aqueduct syndrome and hearing by SCT |
| XING Qing-na1, ZHANG Xiao-an1, ZHAO Xin1, YAO Xiao-bin2 |
| 1. Department of Radiology, the Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; 2. ClinicalLaboratory, Henan Tumor Hospital, the Affiliated Tumor Hospital of Zhengzhou University, Zhengzhou 450008, China |
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Abstract Objective: To evaluate the relationship between large vestibular aqueduct(LVA) and hearing loss, also obtain the threshold of LVA on coronal SCT of temporal bone. Methods: The SCT features of temporal bone from patients with enlarged vestibular aqueduct in the third affiliated hospital of Zhengzhou university were studied retrospectively. The midpoint diameter and width at the outlet of vestibular aqueduct were measured both on the axial and coronal SCT in normal individuals as well as in patients. The hearing tests from two different times were also performed to assess the evalution of hearing loss in patients with LVA. Results: In patients, the average midpoint diameter of the aqueduct was (2.4±0.93) mm and the average width of the aqueduct outlet was (6.21±1.4) mm on transverse view, the midpoint average diameter was (5.48±1.76) mm and the average width of the outlet was (6.87±1.61) mm on coronal view. The threshold value of the transverse diameter of the aqueduct for diagnosis of LVA was 2.5 mm, and the width of the outlet of the aqueduct was 4.25 mm on coronal view. There were no significant differences of both the air conduction and bone conduction from the two different times in patients, P>0.05. Follow-up study showed that 64.3% patients had mild to moderate hearing loss, only 2 cases had hearing improvement, 5 cases had hearing loss. There was no correlation of the vestibular aqueduct diameter with the bone conduction threshold value, while there was strong correlation between air conduction threshold and vestibular aqueduct diameter at low frequencies. Conclusion: Air conduction is the main factor in LVA patients with conductive or mixed hearing loss. SCT coronal scans can provide additional information to assess the LVA, especially when the axial scan diagnosis is insufficient.
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Received: 18 November 2013
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2014, Vol. 25 
