Audiometry: Cochlear versus Retrocochlear Pathology

2015 ◽  
pp. 39-46
Author(s):  
G. C. J. H. Hombergen
Keyword(s):  
Retrocochlear Pathology

Tone Decay and Hearing Threshold Level in Sensorineural Loss

1971 ◽  
Vol 14 (2) ◽  
pp. 345-349
Author(s):  
Donald G. Doehring ◽  
Linda P. Swisher
Keyword(s):  
Hearing Threshold ◽  
Threshold Level ◽  
Threshold Effects ◽  
Frequency Effects ◽  
Tone Decay ◽  
Retrocochlear Pathology ◽  
Sensorineural Loss

Tone decay was assessed by the Bekesy and modified Rosenberg procedures in audiological patients with sensorineural-type loss for whom there was no neurological evidence of retrocochlear pathology. Thirty-five subjects were tested at 500 Hz, 97 at 2000 Hz, and 92 at 4000 Hz. Tone decay tended to increase with increased hearing threshold level for both tests at all three frequencies, with low but significant correlations at two of the three frequencies for each test. There were no systematic differences between the Bekesy and modified Rosenberg procedures with regard to overall level, frequency effects, or hearing threshold effects. A low but significant correlation was obtained between the two procedures at all three frequencies.

Cochlear Implantation in Patients with Neurofibromatosis Type 2 and Other Retrocochlear Pathology: A Review of 32 Cases over 25 Years

2020 ◽  
Author(s):  
Nicholas L. Deep ◽  
Evan Patel ◽  
William H. Shapiro ◽  
Susan B. Waltzman ◽  
Daniel Jethanamest ◽  
...  
Keyword(s):  
Cochlear Implantation ◽  
Neurofibromatosis Type ◽  
Neurofibromatosis Type 2 ◽  
Retrocochlear Pathology

scholarly journals Misdiagnosis of hearing loss due to ear canal collapse: a report of two cases

1996 ◽  
Vol 110 (6) ◽  
pp. 561-566 ◽  
Author(s):  
Cliodna F. O Mahoney ◽  
Linda M. Luxon
Keyword(s):  
Hearing Loss ◽  
External Auditory Meatus ◽  
Noise Induced Hearing Loss ◽  
Ear Canal ◽  
True Nature ◽  
High Frequencies ◽  
Hearing Thresholds ◽  
Retrocochlear Pathology

AbstractCollapse of the external auditory meatus during audiometry can lead to spuriously increased hearing thresholds being obtained, particularly at high frequencies, and may simulate conditions such as noise-induced hearing loss, presbyacusis and retrocochlear pathology. Consequently, inappropriate investigations and management may be undertaken. Two patients with elevated thresholds secondary to ear canal collapse are described. The implications of initially failing to identify the true nature of their ‘hearing losses’ are highlighted and strategies to avoid such pitfalls are discussed.

Magnetic Resonance Imaging in the Search for Retrocochlear Pathology

2001 ◽  
Vol 124 (6) ◽  
pp. 652-655 ◽  
Author(s):  
Jack D. Sedwick ◽  
Byron J. Gajewski ◽  
Angela R. Prevatt ◽  
Patrick J. Antonelli
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Retrocochlear Pathology

scholarly journals Incidental findings on magnetic resonance imaging of the internal auditory meatus performed to investigate audiovestibular symptoms

2016 ◽  
Vol 131 (1) ◽  
pp. 32-36 ◽  
Author(s):  
H M Htun ◽  
S L Mui ◽  
C Williams ◽  
P S Hans
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Incidental Findings ◽  
District General Hospital ◽  
Radiology Department ◽  
Internal Auditory Meatus ◽  
Resonance Imaging ◽  
Sinus Disease ◽  
Age Related ◽  
Retrocochlear Pathology

AbstractObjective:To determine the frequency of incidental findings found on magnetic resonance imaging scans of the internal auditory meatus performed to investigate audiovestibular symptoms, and to determine how to best manage these when found.Method:A retrospective review was conducted of internal auditory meatus magnetic resonance imaging scans during a three-month period in the radiology department at a UK district general hospital.Results:A total of 109 scans were reviewed. Of these, 92.7 per cent showed no retrocochlear pathology, 0.9 per cent showed vestibular schwannoma, 6.4 per cent revealed vascular loops, and 2.8 per cent showed incidental findings that warranted further action and investigation. Of the scans, 40.4 per cent showed other incidental pathologies such as age-related ischaemic changes, and sinus disease that required no further intervention. Of the magnetic resonance imaging scans reviewed, 49.5 per cent were entirely normal.Conclusion:Almost half of the scans investigating audiovestibular symptoms showed incidental findings. Otolaryngologists should have an understanding of the significance of the most commonly encountered incidental findings, and should counsel patients appropriately and refer them onward when necessary.

Schwannoma of the external auditory canal

1995 ◽  
Vol 109 (10) ◽  
pp. 1016-1018 ◽  
Author(s):  
J. P. Harcourt ◽  
M. F. Tungekar
Keyword(s):  
Local Excision ◽  
External Auditory Canal ◽  
English Literature ◽  
Retrocochlear Pathology

AbstractSolitary schwannomas are relatively rare. There has been only one previously reported case, in the English literature, of a schwannoma arising in the external auditory canal. We present a case which was managed by local excision and was unassociated with cochlear or retrocochlear pathology.

scholarly journals Sudden and Asymmetric Hearing Loss Among Active Duty Service Members: Underscoring the Importance of Active Screening

2021 ◽  
Author(s):  
John M Sommerfeldt ◽  
John P Marinelli ◽  
Samuel A Spear
Keyword(s):  
Hearing Loss ◽  
Facial Nerve ◽  
Noise Exposure ◽  
Sudden Hearing Loss ◽  
Active Duty ◽  
Service Members ◽  
Oral Steroid ◽  
Increased Risk ◽  
Asymmetric Hearing Loss ◽  
Retrocochlear Pathology

ABSTRACT Military personnel are at increased risk of asymmetric hearing loss secondary to noise exposure. This report illustrates the importance of expeditiously evaluating for retrocochlear pathology even in young active duty service members with asymmetric or sudden hearing loss. A 36-year-old male presented with right-sided sudden hearing loss and dizziness. Audiometry revealed profound mid-to-high-frequency sensorineural hearing loss in the right ear. A 10-day course of oral steroid therapy and two intratympanic steroid injections were unsuccessful in restoring hearing. MRI revealed a 4.2 cm contrast-enhancing cerebellopontine angle tumor, consistent with a vestibular schwannoma (VS). Microsurgical resection utilizing a retrosigmoid craniotomy approach was performed with near-total resection of the tumor and preservation of the facial nerve but not the cochlear nerve. Despite preservation of the facial nerve, progression of post-operative facial weakness required gold weight placement to prevent exposure keratopathy. The patient had recovered partial function in all facial nerve branches at last follow-up. In light of the rising global incidence of VS, any asymmetric or sudden hearing loss in military service members should be evaluated with audiometry and referral to otolaryngology for workup of retrocochlear pathology.

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