Magnetic resonance imaging versus computed tomography in pre-operative evaluation of cochlear implant candidates with congenital hearing loss

2002 ◽  
Vol 116 (10) ◽  
pp. 804-810 ◽  
Author(s):  
Levent Sennaroglu ◽  
Isil Saatci ◽  
Ayse Aralasmak ◽  
Bulent Gursel ◽  
Ergin Turan
Keyword(s):  
Magnetic Resonance Imaging ◽  
Hearing Loss ◽  
Magnetic Resonance ◽  
Cochlear Implant ◽  
Sensorineural Hearing Loss ◽  
Internal Auditory Canal ◽  
Cochlear Nerve ◽  
Sensorineural Hearing ◽  
Congenital Hearing Loss ◽  
Resonance Imaging

Recent reports indicate that the cochlear nerve may be absent in some cases of congenital sensorineural hearing loss. The aim of this prospective study was to determine the incidence of cochlear nerve anomaly in cochlear implant candidates with congenital hearing loss using magnetic resonance imaging (MRI). Twenty-seven patients with congenital profound bilateral sensorineural hearing loss who were being evaluated for the cochlear implant procedure were studied.These patients had high-resolution computerized tomography (CT), through the petrous bone in axial sections. MRI examinations consisted of T1 and turbo spin echo (TSE) T2-weighted 3 mm axial images, and additional 3D Fourier Transform T2-weighted TSE sequences obtained on three different planes (axial, perpendicular and parallel to the internal auditory canal (IAC) i.e. oblique sagittal and coronal, respectively) for the purpose of cochlear nerve demonstration. Results showed that all of the 14 patients with normal CT of the temporal bone, had four distinct nerves in the distal part of the IAC on TSE-MRI. Thirteen patients demonstrated various bony malformations of the cochleovestibular system on CT. MRI revealed the absence of the cochleovestibular nerve in four patients where the IAC was very narrow or completely absent on CT. One patient with severe Mondini malformation who had an enlarged IAC demonstrated an isolated absent cochlear nerve.

scholarly journals Anatomical and Pathological Findings of Magnetic Resonance Imaging in Idiopathic Sudden Sensorineural Hearing Loss

2020 ◽  
Vol 24 (4) ◽  
pp. 198-203
Author(s):  
Min Bum Kim ◽  
Jihyun Lim ◽  
Il Joon Moon
Keyword(s):  
Magnetic Resonance Imaging ◽  
Hearing Loss ◽  
Magnetic Resonance ◽  
Sensorineural Hearing Loss ◽  
Inner Ear ◽  
Internal Auditory Canal ◽  
Sudden Sensorineural Hearing Loss ◽  
Cochlear Nerve ◽  
Sensorineural Hearing ◽  
Resonance Imaging

Background and Objectives: We sought to evaluate the diagnostic and prognostic value of measurable parameters of internal auditory canal (IAC) magnetic resonance imaging (MRI) in patients with idiopathic sudden sensorineural hearing loss (ISSNHL).Subjects and Methods: We retrospectively reviewed the patients with ISSNHL who underwent IAC MRI from January 2008 to March 2019. Measurable parameters of IAC MRI, such as the diameter of the IAC, bony cochlear nerve canal, and cross-sectional area of the cochlear nerve, were measured by a single examiner. These parameters were then compared between the affected and healthy sides. Inner-ear abnormalities such as intralabyrinthine hemorrhage or labyrinthitis were also evaluated. The relationship between the surveyed parameters and the diagnosis of ISSNHL was assessed.Results: A total of 208 patients with ISSNHL were included. The measured parameters of IAC MRI were not different between the affected and healthy sides and were also not associated with the diagnosis of ISSNHL. However, inner-ear abnormalities of IAC MRI in ISSNHL displayed a significant association with worse hearing before and after treatment. An age that was older than 40 years also correlated with poorer outcomes. Further, inner-ear abnormalities were more frequently detected when IAC MRI was performed early after ISSNHL onset.Conclusions: Patients with ISSNHL and inner ear abnormalities such as intralabyrinthine hemorrhage or labyrinthitis identified via IAC MRI may experience poorer hearing outcomes. To detect such abnormal findings, it is recommended to perform IAC MRI early after the onset of ISSNHL.

Cochlear nerve anomalies in paediatric single-sided deafness – prevalence and implications for cochlear implantation strategies

2020 ◽  
pp. 1-4
Author(s):  
K Pollaers ◽  
A Thompson ◽  
J Kuthubutheen
Keyword(s):  
Magnetic Resonance Imaging ◽  
Hearing Loss ◽  
Magnetic Resonance ◽  
Sensorineural Hearing Loss ◽  
Cochlear Nerve ◽  
Sensorineural Hearing ◽  
Resonance Imaging ◽  
Bilateral Sensorineural Hearing Loss ◽  
Single Sided Deafness ◽  
Cochlear Nerve Hypoplasia

Abstract Objective To determine the prevalence of cochlear nerve anomalies on magnetic resonance imaging in patients with unilateral or bilateral sensorineural hearing loss. Methods A retrospective case series was conducted at a tertiary referral centre. The inclusion criteria were paediatric patients with bilateral or unilateral sensorineural hearing loss, investigated with magnetic resonance imaging. The primary outcome measure was the rate of cochlear nerve hypoplasia or aplasia. Results Of the 72 patients with unilateral sensorineural hearing loss, 39 per cent (28 cases) had absent or hypoplastic cochlear nerves on the affected side. Fifteen per cent (11 cases) had other abnormal findings on magnetic resonance imaging. Eighty-four patients had bilateral sensorineural hearing loss, of which cochlear nerve hypoplasia or aplasia was identified only in 5 per cent (four cases). Other abnormal findings were identified in 14 per cent (12 cases). Conclusion Paediatric patients with unilateral sensorineural hearing loss are more likely to have cochlear nerve anomalies than those patients with bilateral sensorineural hearing loss. This has important implications regarding cochlear implantation for patients with single-sided deafness.

Early diagnosis and treatment of Ramsay Hunt syndrome: the role of magnetic resonance imaging

1995 ◽  
Vol 109 (8) ◽  
pp. 777-780 ◽  
Author(s):  
M. J. Kuo ◽  
P. C. Drago ◽  
D. W. Proops ◽  
S. V. Chavda
Keyword(s):  
Magnetic Resonance Imaging ◽  
Hearing Loss ◽  
Magnetic Resonance ◽  
Sensorineural Hearing Loss ◽  
Internal Auditory Canal ◽  
Sensorineural Hearing ◽  
Resonance Imaging ◽  
Ramsay Hunt Syndrome ◽  
Hunt Syndrome

AbstractWe present the case of a 47-year-old woman with left otalgia, rotatory vertigo, sensorineural hearing loss and acute facial nerve palsy. An enhanced magnetic resonance imaging (MRI) scan showed discrete enhancement of the facial and vestibulocochlear nerves in the left internal auditory canal as well as of the labyrinth. This appearance was compatible with that in Ramsay Hunt syndrome and acyclovir was started prior to the appearance of any vesicular eruption. The diagnosis was subsequently confirmed serologically. She regained full facial function but the sensorineural hearing loss persisted. The literature pertaining to the role of the MRI in acute facial palsies is reviewed.

scholarly journals Intralabyrinthine Schwannomas: Disease Presentation, Tumor Management, and Hearing Rehabilitation

2019 ◽  
Vol 80 (02) ◽  
pp. 196-202 ◽  
Author(s):  
Baishakhi Choudhury ◽  
Matthew Carlson ◽  
Daniel Jethanamest
Keyword(s):  
Magnetic Resonance Imaging ◽  
Hearing Loss ◽  
Magnetic Resonance ◽  
Sensorineural Hearing Loss ◽  
Sensorineural Hearing ◽  
Resonance Imaging ◽  
Hearing Rehabilitation ◽  
Rare Tumors ◽  
Auditory Rehabilitation ◽  
Tumor Management

AbstractIntralabyrinthine schwannomas (ILS) are rare tumors that frequently cause sensorineural hearing loss. The development and increased use of magnetic resonance imaging in recent years have facilitated the diagnosis of these tumors that present with otherwise nondiscriminant symptoms such as tinnitus, vertigo, and hearing loss. The following is a review of the presentation, pathophysiology, imaging, and treatment with a focused discussion on auditory rehabilitation options of ILS.

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