الفهرس 
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Abstract
Conclusions
Preoperative imaging before CI surgery, notwi¬thstanding its limitations, is important, particularly when done according to ideal standards. This approach supports not only selecting appropriate cases for CI surgery, but also preparing surgeons for overcoming abnormalities and avoiding complications that could potentially have a negative effect on the procedure and its results.
CT and MRI provide different, but complementary information. CT is excellent for demonstrating details of the temporal bone, mastoid pneumatization and co¬chlear patency. CT is inadequate for visualizing of inner ear neural structures, fluid or fibrosis. MRI is supe¬rior to CT in demonstrating inner auditory canal nerves, retrocochlear diseases and membranous alterations of the inner ear; it fails to provide information about bone structures and is more costly.
Recommendations
Patients who are indicated for CI and fulfill criteria for indicating CI with no medical, surgical or radiological contraindication should have CI surgery. All Patients should have done both CT and MRI and also postoperative x-ray to confirm the normal position of the electrode. Short (compressed) electrode should be ready at time of surgery in case failure to insert long (full) electrode.