The frequency of cochlear implantation is increased and considered an acceptable treatment for severe to profound SNHL. Preoperative CT and MRI assessment is critical for determining implant candidacy, each has its own proponents and importance. Radiologist must be familiar with imaging findings that absolutely or relatively contraindicate implantation and with others that may complicate surgery. Radiologists will assume an expanding role in patients evaluation as the frequency of cochlear implantation continues to increase.