Background: MDCT and MRI plays a critical role in evaluation and management of different causes of hearing loss which require many therapeutic techniques including cochlear implantation. MDCT has proven its efficacy in the postoperative imaging of cochlear implant patients. CT confirms the intracochlear position of the implant. It has also been shown that malpositioning and kinking can be detected by CT imaging. Aim of the Work: To evaluate the role of various imaging modalities (CT and MRI) in pre and postoperative evaluation of cochlear implant candidates. Patients and Methods: The study included a total of 20 patients referred to the Radiodiagnosis Department from the E.N.T Department in EL-Galaa Military Hospital. The patients had bilateral severe to profound sensorineural hearing loss (SNHL). CT and MRI were done for assessment of the cochlear state prior to the cochlear implantation operation. Postoperative CT was done to underline the position of implanted electrode. Results: The study was performed on 8 males (40%) and 12 females (60%). Only 17 patients (85%) underwent cochlear implantation, the other 3 cases (15%) were diagnosed as Michel deformity, Cochlear hypoplasia and Labyrinthine ossificans. Full electrode array insertion was reported in all cases underwent of cochlear implantation. Conclusion: Preoperative CT and MRI assessment is critical for determining implant candidacy. Postoperative CT confirms the intracochlear position of the implant