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Auditory Pathway Features Determined by DTI in Subjects with Unilateral Acoustic Neuroma

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Abstract

Purpose

In the studies concerning the pathology of the auditory pathway in the vestibulocochlear system, few use advanced neuroimaging applications of magnetic resonance imaging (MRI) such as diffusion tensor imaging (DTI). Those who did use reported DTI changes only at the lateral lemniscus and inferior colliculus level. The aim of our study was to determine diffusion changes in the bilateral auditory pathways of subjects with unilateral acoustic neuroma (AN) and compare them with healthy controls.

Material and Methods

A total of 15 subjects with unilateral AN along with 11 controls underwent routine MRI and DTI. Apparent diffusion coefficient (ADC) and fractional anisotropy (FA) values obtained from the lateral lemniscus, inferior colliculus, corpus geniculatum mediale, and Heschl’s gyrus of the auditory pathway were then compared.

Results

The subjects’ ADC values measured from the contralateral side were significantly higher at the lateral lemniscus, inferior colliculus, and corpus geniculatum mediale compared with those of the controls. Also, decreased FA values were noted at the inferior colliculus for both the contralateral and ipsilateral sides. The highest ADC values were detected in the inferior colliculus of the auditory pathway.

Conclusions

In the auditory pathway of subjects with AN, the contralateral side is more affected than the ipsilateral side, the most affected region being the inferior colliculus. DTI is an advanced neuroimaging technique that can be used to determine the presence of microstructural damage to the auditory pathway in subjects with AN, whereas conventional MRI is not sensitive enough to detect damage.

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Acknowledgments

The authors appreciate the contributions and editorial assistance by S. Delacroix, a native speaker of English.

Conflict of Interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Radiology, Faculty of Medicine, Bezmialem Vakif University, 34093, Istanbul, Turkey

    S. Kurtcan, A. Alkan, A.A. Bakan, H. Toprak & A. Aralasmak

  2. Department of Radiology, Faculty of Medicine, Medipol University, Istanbul, Turkey

    R. Kilicarslan

  3. Department of Otorhinolaryngology, Bezmialem Vakif University School of Medicine, Istanbul, Turkey

    F. Aksoy

  4. Department of Neurology, Faculty of Medicine, Medeniyet University, Istanbul, Turkey

    A. Kocer

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  1. S. Kurtcan
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  2. A. Alkan
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Correspondence to S. Kurtcan.

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Kurtcan, S., Alkan, A., Kilicarslan, R. et al. Auditory Pathway Features Determined by DTI in Subjects with Unilateral Acoustic Neuroma. Clin Neuroradiol 26, 439–444 (2016). https://doi.org/10.1007/s00062-015-0385-z

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  • DOI: https://doi.org/10.1007/s00062-015-0385-z

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