Radiological requirements for surgical planning in cochlear implant candidates

Mohamad Hasan Alam-Eldeen; Usama Mohamed Rashad; Al Hussein Awad Ali

doi:10.4103/ijri.IJRI_55_17

Indian Journal of Radiology and Imaging, Inhaltsverzeichnis

CC BY-NC-ND 4.0 · Indian J Radiol Imaging 2017; 27(03): 274-281
DOI: 10.4103/ijri.IJRI_55_17

Neuroradiology & Head and Neck Imaging

Radiological requirements for surgical planning in cochlear implant candidates

Mohamad Hasan Alam-Eldeen

Department of Diagnostic Radiology, Sohag Faculty of Medicine, Sohag University, Sohag, Egypt

,

Usama Mohamed Rashad

Department of Otolaryngology, Sohag Faculty of Medicine, Sohag University, Sohag, Egypt

,

Al Hussein Awad Ali

Department of Otolaryngology, Sohag Faculty of Medicine, Sohag University, Sohag, Egypt

› Institutsangaben

Abstract

als PDF herunterladen

Abstract

Objective: This study is concerned with clarification of radiological findings that should be addressed and reported in patients listed for cochlear implant (CI) operation. These findings may force a surgeon to consider modifications of the surgical approach by a CI surgeon. Materials and Methods: The study was performed from January 2015 to January 2016. It included 50 patients with severe-to-profound sensorineural hearing loss who fulfilled the criteria for CI. Patients underwent CI surgery in the Department of Otolaryngology. All patients underwent preoperative computed tomography (CT) and magnetic resonance imaging (MRI) assessment in the Department of Diagnostic Radiology. Combined examination of the CT and MRI by the radiologist and the surgeon was advocated. Results: Many anatomical variants were observed regarding the pattern of mastoid pneumatization, position of middle cranial fossa dura, sigmoid sinus position jugular bulb position, and the size and position of the mastoid segment of facial nerve canal. Labyrinthitis ossificans was seen in 3 patients (6%), otospongiosis in 1 patient (2%), and dilated vestibular aqueduct and endolymphatic sac in 9 patients (18%). Conclusion: Cochlear implantation is a major treatment modality in patients with severe-to-profound sensorineural hearing loss. Radiological evaluation is integral in surgery planning.

Keywords

Cochlear implantation - computed tomography - magnetic resonance imaging - surgical considerations

PDF (2633 kb)

Referenzen

References
1 Joshi VM, Navlekar SK, Kishore GR, Reddy KJ, Kumar EC. CT and MR imaging of the inner ear and brain in children with congenital sensorineural hearing loss. Radiographics 2012;32:683-98.
2 Witte RJ, Lane JI, Driscoll CL, Lundy LB, Bernstein MA, Kotsenas AL, et al. Pediatric and adult cochlear implantation. Radiographics 2003;23:1185-200.
3 Taha T, Wahba H, Ibrahim AS, Abd Elazim Y. Cochlear implant tailored imaging protocol: What clinicians need to know. Egyptian J Radiol Nucl Med 2015;46:33-43.
4 Karaca CT, Toros SZ, Noseri HK. Analysis of anatomic variations in temporal bone by radiology. Int Adv Otol 2012;8:239-43.
5 Dupuch KM, Meyer B. Cochlear implant assessment: Imaging issues. Eur J Radiol 2001;40:119-32.
6 Hindi K, Alazzawi S, Raman R, Prepageran N, Rahmat K. Pneumatization of mastoid air cells, temporal bone, ethmoid and sphenoid sinuses. Any correlation? Indian J Otolaryngol Head Neck Surg 2014;66:429-36.
7 Koc A, Karaaslan O, Koc T. Mastoid air cell system. Otoscope 2004;4:144-54.
8 Kontorinis G; Lenarz T, Schwab B. Anatomic limitations in implantation of middle ear transducer and carina middle ear implants. Laryngoscope 2010;120:2289-93.
9 Reis CVC, Deshmukh V, Zabramski JM, Crusius M, Deshmukh P, Preul MC, et al. Anatomy of the mastoid emissary vein and venous system of the posterior neck region: Neurosurgical implications. Neurosurgery 2007;61:193-201.
10 Kim CW, Oh SJ, Kim HS, Ha SH, Rho YS. Analysis of axial temporal bone computed tomography scans for performing a safe posterior tympanotomy. Eur Arch Otorhinolaryngol 2008;265:887-91.
11 Hasaballah MS, Hamdy TA. Evaluation of facial nerve course, posterior tympanotomy width and visibility of round window in patients with cochlear implantation by performing oblique sagittal cut computed tomographic scan temporal bone. Egyptian J Otolaryngol 2014;30:317-21.
12 Chuang MT, Chiang IC, Liu GC, Lin WC. Multi-detector row CT demonstration of inner and middle ear structures. Clin Anat 2006;19:337-44.
13 McRackan TR, Reda FA, Rivas A, Noble JH, Dietrich MH, Dawant BM, et al. Comparison of cochlear implant relevant anatomy in children versus adults. Otol Neurotol 2012;33:328-34.
14 Weissman JL, Hirsch BE. Imaging of Tinnitus: A Review. Radiology 2000;216:342-9.
15 Filipovic'B, Gjuric'M, Hat J, Glunc I. High mega jugular bulb presenting with facial nerve palsy and severe headache. Skull Base 2010;20:465-8.
16 Caldemeyer KS, Mathews VP, Azzarelli B, Smith RR. The jugular foramen: A review of anatomy, masses, and imaging characteristics. Radiographics 1997;17:1123-39.
17 Ong CK, Chong VHF. Imaging of jugular foramen. Neuroimag Clin N Am 2009;19:469-82.
18 Kawano H, Tono T, Schachern PA, Paparella MM, Komune S. Petrous high jugular bulb: A histological study. Am J Otolaryngol 2000;21:161-8.
19 Offiah CE, Ramsden RT, Gillespie JE. Imaging appearances of unusual conditions of the middle and inner ear. Br J Radiol 2008;81:504-14.
20 Davidson HC. Imaging of the temporal bone. Magn Reson Imaging Clin N Am 2002;10:573-613.
21 Okamoto K, Ito J, Furusawa T, Sakai K, Tokiguchi S. Large vestibular aqueduct syndrome with high CT density and high MR signal intensity. AJNR Am J Neuroradiol 1997;18:482-4.
22 Valvassori GE, Clemis JD. The large vestibular aqueduct syndrome. Laryngoscope 1978;88:723-8.
23 Vlastarakos PV, Kiprouli C, Pappas S, Xenelis J, Maragoudakis P, Troupis G, et al. CT scan versus surgery: How reliable is the preoperative radiological assessment in patients with chronic otitis media. Eur Arch Otorhinolaryngol 2012;269:81-6.
24 Park E, Amoodi H, Kuthubutheen J, Chen JM, Nedzelski JM, Lin VY. Predictors of round window accessibility for adult cochlear implantation based on pre-operative CT scan: A prospective observational study. J Otolaryngol Head Neck Surg 2015;44:20.
25 Júnior L, Rocha MD, Walsh PV, Antunes CA, Calhau CM. Evaluation by imaging methods of cochlear implant candidates: Radiological and surgical correlation. Rev Bras Otorrinolaringol 2008;74:395-400.
26 Pendem SK, Rangasami R, Kumar AR, Sai PMV, Natarajan P. Preoperative HRCT temporal bone measurement useful for cochlear implantation in children: Correlation between pre-op HRCT and surgical measurement. Int J Recent Trends Sci Technol 2015;14:460-4.
27 Saki N, Saki S, Zarandy MM. The first step toward improving cochlear implant insertion using a new technique called slide method (Motasaddi Method). Int J Pharm Res Allied Sci 2016;5:110-3.