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[3D CISS, 3D MP-PAGE and 2D TSE for the preoperative MRI prior to cochlear implantation]
1Institut für Röntgendiagnostik, Klinikum der Universität Regensburg. Johannes.Seitz@Klinik.Uni-Regensburg.de
Purpose:
The aim of this study was to determine the presurgical predictive value of high resolution MRI in patients scheduled for cochlear implantation.
Method And Material:
The presurgical MRI (3D CISS, 3D MP-RAGE with and without i.v. contrast medium, 2D TSE) findings of 54 patients and the intraoperative situation reported by the surgeon were compared retrospectively. The surgical and functional success of the cochlear implantation was evaluated.
Results:
We found a high degree of correlation between MRI and intraoperative findings concerning the patency of the whole cochlea and anomalies as well as in the diagnosis of pathology of the cochlear, vestibular and facial nerves and in anomalies of the internal auditory canal. However, in four out of 54 patients there was a false negative prediction regarding the patency of the cochlea. The sensitivity was 50% (4/8), the specificity 100% (46/46). Concerning the surgical success the accuracy was 100%. In all patients MRI gave sufficient anatomical information to the surgeon concerning the jugular bulb and the facial nerve.
Conclusion:
A high-resolution MRI protocol consisting of coronal 2D T2w TSE, 3D T2*w transverse CISS; plain and contrast enhanced sagittal T1w 3D MP-RAGE is recommended for the evaluation of candidates scheduled for cochlear implantation.