Results of cochlear implantation candidate patients by high resolution computed tomography and magnetic resonance imaging

• Main Authors: Mustafa Reşorlu, Reyhan Meydan
• Format: Article
• Language: English
• Published: Dicle University Medical School 2012-09-01
• Series: Dicle Medical Journal
• Subjects: Cochlear implantation; high resolution computed tomography; magnetic resonance imaging
• Online Access: http://www.diclemedj.org/upload/sayi/3/Dicle%20Med%20J-01161.pdf

To evaluate the effectiveness of high resolutioncomputed tomography (HRCT) and magnetic resonanceimaging (MRI) for assessment of factors whichwould influence the type and success of surgery in patientsundergoing cochlear implantation.Materials and methods: All patients underwent HRCTimaging while MRI was performed in 38 of them. MRIand HRCT images were evaluated for mastoid cell pneumatization,sigmoid sinus localization, aberrant vascularstructures, congenital anomalies, cochlear stenosis, labyrinthossification, infection, internal acoustic canal width,presence of vestibulo-cochlear nerve, semicircular canals,cerebellopontin area, and cochlear and vestibularaquaduct width.Results: Totally 49 patients (29 males and 20 femaleswith a mean age of 12.3 years (1 - 61 years) were included.Various abnormalities or congenital anomalies werefound in 35 patients by HRCT and MRI. We observedgrade 1 mastoid cell pneumatization in 58 ears (59.3%),grade 2 in 23 (23.4%) and grade 3 in 17. Furthermorethe position of sigmoid sinus (p<0.001) and mastoidwidth (p<0.001) were affected by mastoid cell ventilation.HRCT provides knowledge about mastoid and middle earventilation, cortical bone thickness, round window niche,perilymphatic-endolymphatic compartment and status ofinternal acoustic canal. Pathologies such as otosclerosisand Paget disease that involve otic capsule can berevealed by CT. MRI can provide views of intracochlearviscosity and cochlear opening, semicircular canals, cerebellopontinarea, and vestibulocochlear nerve.Conclusions: HRCT and MRI provide information aboutthe etiology of hearing loss, suitable side for cochlearimplantation and detection of abnormalities or anatomicvariations that may cause complications introperatively.Key words: Cochlear implantation, high resolution computedtomography, magnetic resonance imaging