الفهرس 
Embryollogy off tthe Inner EarOnly 14 pages are availabe for public view
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Abstract
SUMMARY
Cochlear implantation is a globally accepted treatment option for
patients with severe to profound sensorineural hearing loss.
Pre-operative imaging by CT, MRI or both modalities is essential for
candidate selection and exclusion of contraindications.
Post-operative imaging by radiography, or more recently by CT, is
performed for confirmation of proper electrode placement or evaluation of
suspected complications.
Assessing the cochlear morphology is essential for non-traumatic
electrode insertion and hearing preservation in individual surgery.
The aim of this study to evaluate the role of MDCT in preoperative
prediction of the best cochlear implant electrode length with detection of the
variations in cochlear size that may influence the final maximum insertion
depth angle achieved with cochlear implant electrode arrays.
We enrolled in this study 40 patients (21 female and 19 male), the
most common age group encountered in this study was between 4 and 10
years with mean age 24.63±17.30 years. All suffered from severe
sensorineural hearing loss.
All patients were evaluated by careful history taking, clinically
evaluated, and then subjected for radiological examination included noncontrast
CT examination of the petrous bone before and after cochlear
implantation.
In the majority of cases, the etiology of sensorineural hearing loss was
unknown (72.5%), followed by post-febrile illness (7.5%). The other causes