الفهرس 
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Abstract
CT and MRI plays a critical role in evaluation and management of different causes of hearing loss which require many therapeutic techniques including cochlear implantation.
This study was conducted on 50 patients with severe to profound sensory neural hearing loss and were subjected to Multislice CT and MRI before CI at Department of Radiology, Assiut University.
Regarding demographic data in all studied patients, the mean age of all studied patients was 16 ± 9.1 years with minimum age of 1 year and maximum age of 31 years. There were 27 males (54%) and 23 females (46%) in the studied patients.
In our study Cochear development by CT revealed that Cochlea was well developed in 78 ears (78%) and not well developed in 22 ears (22%) in the studied patients.
Examining of Cochlear patency by CT in all studied patients, we detected that Cochlea was patent in 90 ears (91.8%) and not patent in 8 ears (8.2%) in the studied patients.
In the current study, the mean cochlear length by CT was 8.9 ± 0.78 mm with minimum cochlear length of 5.4 mm and maximum cochlear length of 9.3 mm.
Vestibule and semicircular canals by CT in our studied patients, vestibule was patent in 75 ears (75%) and not patent in 25 ears (25%) in the studied patients.
In our study, SCC was patent in 78 ears (78%) and not patent in 22 ears (22%) in the studied patients.
In the current study, round window accessibility by CT was easy in 92 ears (91.8%) and difficult in 8 ears (8.2%) in the studied patients.
Cochlear development detected by preoperative MRI confirmed the findings detected by MSCT.
Cochlear nerve data obtained only by MRI in our patients, there was cochlear nerve aplasia in 12 ears (12%), cochlear nerve hypoplasia in 5 ears (5%) and cochlear nerve mass in 1 ear (1%) while it was intact in 82 ears (82%) of the studied.