3D CISS, 3D MP-PAGE and 2D TSE for MRI prior to cochlear implantation.

Purpose: The aim of this study was to determine the presurgical predictive value of high resolution MRI in patients scheduled for chochlear implantati on. 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 intra operative situation reported by the surgeon were compared retrospectively. The surgical and functional success of the cochlear implantation was evalua ted. Results: We found a high degree of correlation between MRI and intraop erative findings concerning the patency of the whole cochlea and anomalies as well as in the diagnosis of pathology of the cochlear, vestibular and fa cial nerves and in anomalies of the internal auditory canal. However, in fo ur out of 54 patients there was a false negative prediction regarding the p atency of the cochlea. The sensitivity was 50% (4/8), the specificity 100% (46/46). Concerning the surgical success the accuracy was 100%. In all pati ents MRI gave sufficient anatomical information to the surgeon concerning t he jugular bulb and the facial nerve. Conclusion: A high-resolution MRI pro tocol consisting of coronal 2D T2w TSE, 3D T2 * w transverse CISS; plain an d contrast enhanced sagittal T1w 3D MP-RAGE is recommended for the evaluati on of candidates scheduled for cochlear implantation.