الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 104 |  |  |
| | | from | 104 | | |
Abstract
A traumatic surgery has been a major goal of CI surgery, with a growing trend toward round window insertion (RWI).
One of the challenges with surgical insertion of CIs is the lack of visibility once the electrode array enters the cochlea, which precludes visualization of both insertion dynamics and final electrode array position within the cochlea.
Posterior tympanotomy is the most common method of cochlear implant surgery. The round window route for cochlear implant (CI) reduces the risk of intra-cochlear damage. Cochlear implants via round approach preserves residual hearing.
Imaging is essential in the preoperative evaluation of the sensorineural hearing loss (SNHL) patients who are candidates for CI. Cautions regarding the anomalies and pathologies that may represent a potential surgical hazard or that may require modification of the surgical approach is important.
Some radiological parameters had a statistically significant relation with round window intra-operative visibility as; Modified Park et al, Kashio et al, Mandour et al, round window shape and width, round window short process of the incus distance, basal turn of the cochlea and its relation to the sagittal plane and the cochlear axis relation with the axis of the petrous part of the internal carotid artery.
Other radiological parameters had a non statistically significant relation with intra-operative round window visibility as; the jugular bulb grade, the facial recess width, the round window depth and the round window oval window distance.
So prior identification of the round window and its relation to the surrounding structures by pre-operative temporal bone computed tomography is helpful in the prediction of the difficulty of round window exposure and is considered a road map because of its role in assessment the round window.