Nerve Canals at the Fundus of the Internal Auditory Canal on High-Resolution Temporal Bone CT

2001 ◽  
Vol 45 (6) ◽  
pp. 565
Author(s):  
Joon Ha Ji ◽  
Eun Kyung Youn ◽  
Seung Chul Kim
Keyword(s):  
High Resolution ◽  
Temporal Bone ◽  
Internal Auditory Canal ◽  
Temporal Bone Ct

scholarly journals Unilateral internal auditory canal stenosis with progressive facial weakness

2012 ◽  
Vol 18 (2) ◽  
pp. 179-182
Author(s):  
Sathiya Murali ◽  
Arpana Shekhar ◽  
S Shyam Sudhakar ◽  
Kiran Natarajan ◽  
Mohan Kameswaran
Keyword(s):  
Hearing Loss ◽  
High Resolution ◽  
Facial Nerve ◽  
Temporal Bone ◽  
Internal Auditory Canal ◽  
Facial Weakness ◽  
Profound Hearing Loss ◽  
Canal Stenosis ◽  
Temporal Bone Ct ◽  
Magnetic Resonance Imaging Mri

Internal auditory canal (IAC) stenosis is a rare cause of sensorineural hearing loss. Patient may present with symptoms of progressive facial nerve palsy, hearing loss, tinnitus and giddiness. High resolution temporal bone CT-scan and magnetic resonance imaging (MRI) are the important tools for diagnosis. No specific management has been devised. Here is presentation of a case of unilateral (left) IAC stenosis with profound hearing loss and progressive House Brackmann Grade III-IV facial weakness. The diameter of the IAC was less than 2 mm on high resolution temporal bone computed tomography (HRCT) scan. It was managed by facial nerve decompression by translabyrinthine approach in an attempt to prevent further deterioration of facial palsy. DOI: http://dx.doi.org/10.3329/bjo.v18i2.12014 Bangladesh J Otorhinolaryngol 2012; 18(2): 179-182

Congenital internal auditory canal stenosis

2003 ◽  
Vol 117 (10) ◽  
pp. 784-787 ◽  
Author(s):  
Seung Kuk Baek ◽  
Sung Won Chae ◽  
Hak Hyun Jung
Keyword(s):  
Hearing Loss ◽  
High Resolution ◽  
Facial Nerve ◽  
Ct Scan ◽  
Sensorineural Hearing Loss ◽  
Temporal Bone ◽  
Nerve Palsy ◽  
Facial Nerve Palsy ◽  
Internal Auditory Canal ◽  
Canal Stenosis

Congenital internal auditory canal stenosis is a rare cause of sensorineural hearing loss in children. A retrospective analysis including clinical manifestation and radiological findings was made for seven patients who were diagnosed with congenital internal auditory canal stenosis from 1996 to 2002. Chief presenting symptoms were hearing loss, facial nerve palsy, dizziness, and tinnitus. Hearing loss including deafness was found in five cases, vestibular function loss in four cases, and profound functional loss of facial nerve in two cases. In all cases, the diameter of the internal auditory canal was less than 2 mm on high-resolution temporal bone computed tomography (CT) scan. Two cases revealed bilateral internal auditory canal stenosis, and others were unilaterally involved cases. Congenital internal auditory canal stenosis can be an important cause of sensorineural hearing loss, facial nerve palsy, and vestibular dysfunction. High resolution temporal bone CT scan and magnetic resonance (MR) imaging were important tools for diagnosis.

scholarly journals Risk of Posterior Semicircular Canal Trauma when using a Retrosigmoid approach for Acoustic Neuroma Surgery and role of Endoscopy: An Imaging Study

2018 ◽  
Vol 97 (1-2) ◽  
pp. 24-30 ◽  
Author(s):  
Ali Kouhi ◽  
Varasteh Vakili Zarch ◽  
Ali Pouyan
Keyword(s):  
Temporal Bone ◽  
Semicircular Canal ◽  
Internal Auditory Canal ◽  
Imaging Study ◽  
Hearing Preservation ◽  
Neoplastic Disease ◽  
Posterior Semicircular Canal ◽  
Temporal Bone Ct ◽  
Temporal Bones

The rate of hearing preservation after vestibular schwannoma surgery is variable and is not as high as expected, possibly due to injuries to the posterior semicircular canal while exposing the tumor. The aim of this study was to estimate the risk of posterior semicircular canal injuries using temporal bone computed tomography (CT) scan findings. Temporal bone CT scans of 30 patients selected between 2013 and 2015 were studied. The median age of the patients was 40 years. Two planes were studied: (1) the axial plane that shows the common crus of the posterior semicircular canal and (2) the coronal plane that shows the two crura of the posterior semicircular canal. Five lines were drawn and four angles and three distances were measured. In this study, we divided the patients into three groups consisting of 10 patients each: (1) patients with no evidence of inflammatory or neoplastic disease, (2) those with chronic ear disease, and (3) those with vestibular schwannomas. The portion of the internal auditory canal that was exposed by drilling while preserving the posterior semicircular canal was 53 to 64% and 61 ± 9% in whole temporal bones in the three groups. The mean angle of vision with an endoscope was less than 105° in 56% of cases, which means even with a 30° endoscope, the fundus could not be visualized. Therefore, according to our data, it seemed impossible to expose the whole length of the internal auditory canal from the porus to the fundus without causing injury to the posterior semicircular canal. However, the use of endoscopes may help to prevent injury.

scholarly journals Risk of Posterior Semicircular Canal Trauma When Using a Retrosigmoid Approach for Acoustic Neuroma Surgery and Role of Endoscopy: An Imaging Study

2018 ◽  
Vol 97 (1-2) ◽  
pp. 24-30
Author(s):  
Ali Kouhi ◽  
Varasteh Vakili Zarch ◽  
Ali Pouyan
Keyword(s):  
Temporal Bone ◽  
Semicircular Canal ◽  
Internal Auditory Canal ◽  
Imaging Study ◽  
Hearing Preservation ◽  
Neoplastic Disease ◽  
Posterior Semicircular Canal ◽  
Temporal Bone Ct ◽  
Temporal Bones

The rate of hearing preservation after vestibular schwannoma surgery is variable and is not as high as expected, possibly due to injuries to the posterior semicircular canal while exposing the tumor. The aim of this study was to estimate the risk of posterior semicircular canal injuries using temporal bone computed tomography (CT) scan findings. Temporal bone CT scans of 30 patients selected between 2013 and 2015 were studied. The median age of the patients was 40 years. Two planes were studied: (1) the axial plane that shows the common crus of the posterior semicircular canal and (2) the coronal plane that shows the two crura of the posterior semicircular canal. Five lines were drawn and four angles and three distances were measured. In this study, we divided the patients into three groups consisting of 10 patients each: (1) patients with no evidence of inflammatory or neoplastic disease, (2) those with chronic ear disease, and (3) those with vestibular schwannomas. The portion of the internal auditory canal that was exposed by drilling while preserving the posterior semicircular canal was 53 to 64% and 61 ± 9% in whole temporal bones in the three groups. The mean angle of vision with an endoscope was less than 105° in 56% of cases, which means even with a 30° endoscope, the fundus could not be visualized. Therefore, according to our data, it seemed impossible to expose the whole length of the internal auditory canal from the porus to the fundus without causing injury to the posterior semicircular canal. However, the use of endoscopes may help to prevent injury.

scholarly journals Cerebrospinal Fluid Leak During Stapes Surgery: The Importance of Temporal Bone CT Reconstructions in Oblique Anatomically Oriented Planes

2021 ◽  
pp. 014556132098456
Author(s):  
Massimo Re ◽  
Mirko Giannoni ◽  
Alfonso Scarpa ◽  
Claudia Cassandro ◽  
Massimo Ralli ◽  
...  
Keyword(s):  
Cerebrospinal Fluid ◽  
Temporal Bone ◽  
Internal Auditory Canal ◽  
Cerebrospinal Fluid Leak ◽  
High Resolution Computed Tomography ◽  
Temporal Bone Ct ◽  
Patients At Risk ◽  
Bone Structures ◽  
Fluid Leak

Stapes gusher is a massive flow of perilymph and cerebrospinal fluid leak that fills the middle ear immediately after surgical opening of the labyrinth, such as during stapedectomy. Stapes gusher usually occurs as the result of a congenital malformation that causes an abnormal communication between the perilymphatic space and the subarachnoid space involving the internal auditory canal or the cochlear duct. To date, the potential risk of stapes gusher cannot be assessed preoperatively, as there are not pathognomonic signs suggestive of this complication. However, high-resolution computed tomography scan (HRCT) of the temporal bone can provide information that may help recognizing patients at risk. Recently, an anatomic evaluation of the inner ear with oblique reformation at HRCT has been described. This reformation offers a new and more detailed topographic vision of temporal bone structures compared to the classic axial and coronal planes and may help identifying anatomical alterations otherwise not visible. In this article, we present a case of stapes gusher and the role of preoperative HRCT with oblique reformation in its prevention.

Narrow internal auditory canal syndrome: parasaggital reconstruction

2000 ◽  
Vol 114 (5) ◽  
pp. 392-394 ◽  
Author(s):  
Yang-Sun Cho ◽  
Dong Gyu Na ◽  
Jae Yun Jung ◽  
Sung Hwa Hong
Keyword(s):  
Magnetic Resonance ◽  
High Resolution ◽  
Facial Nerve ◽  
Temporal Bone ◽  
Magnetic Resonance Image ◽  
Internal Auditory Canal ◽  
The Other ◽  
Vestibulocochlear Nerve ◽  
Computed Tomographic ◽  
Canal Syndrome

Narrow internal auditory canal (IAC) syndrome is a malformation of the temporal bone, that is defined as an IAC diameter of only 1–2 mm on high-resolution computed tomographic scans (HRCT). This syndrome is known to be caused by the absence (aplasia or hypoplasia) of the vestibulocochlear nerve. We present a case of unilateral narrow IAC syndrome which was diagnosed by HRCT. The aplasia of the vestibulocochlear nerve was confirmed using parasigittal reconstruction magnetic resonance image (MRI). The IAC was composed of two separate canals, one of which contained a facial nerve and the other was empty with aplasia of the vestibulocochlear nerve.

Comparative Study Using Computed Tomographic Thin-Section Zoom Reconstructions and Anatomic Macrosections of the Temporal Bone

1981 ◽  
Vol 90 (6) ◽  
pp. 643-649 ◽  
Author(s):  
Charles W. Beatty ◽  
Lowell D. Harris ◽  
Ku Won Suh ◽  
David F. Reese
Keyword(s):  
High Resolution ◽  
Image Reconstruction ◽  
Temporal Bone ◽  
Thin Section ◽  
Internal Auditory Canal ◽  
Semicircular Canals ◽  
Resolution Image ◽  
Computed Tomographic ◽  
High Resolution Image ◽  
Vestibular Aqueduct

Thin-section (1.5 mm) high-spatial-resolution computed tomography (CT) in combination with computerized high-resolution image reconstruction is an effective, noninvasive means of studying patients with a variety of temporal bone abnormalities. To determine what degree of definition and anatomic accuracy could currently be obtained by using these techniques, we performed thin-section CT and high-resolution image reconstruction with use of two fresh-frozen cadaver head specimens. We then compared these images with the actual anatomic macrosections subsequently obtained from the specimens. We concluded that high-resolution CT scans of the temporal bone can produce accurate, highly detailed, diagnostic images of the internal auditory canal, vestibule, cochlea, vestibular aqueduct, semicircular canals, ossicles, and middle ear space.

scholarly journals High resolution temporal bone computerized tomography in paediatric sensorineural hearing loss prior to cochlear implantation

2020 ◽  
Vol 6 (2) ◽  
pp. 282
Author(s):  
Suhail Rafiq ◽  
Fahad Shafi ◽  
Ajaz Mohiuddin ◽  
Sajjad A. Dar
Keyword(s):  
Hearing Loss ◽  
High Resolution ◽  
Cochlear Implant ◽  
Sensorineural Hearing Loss ◽  
Temporal Bone ◽  
Computerized Tomography ◽  
Cochlear Implantation ◽  
Internal Auditory Canal ◽  
Vestibular Aqueduct ◽  
Hrct Temporal Bone

<p class="abstract"><strong>Background:</strong> Congenital sensorineural hearing loss (SNHL) is one of the most common birth defects with incidence of approximately 1:1000 live births. Imaging plays an important role in the work up of cochlear implant candidates not only to identify inner ear congenital and acquired abnormalities or cochlear nerve anomalies but also to detect temporal bone abnormalities or variations that may alter surgical approach. Preoperative evaluation of cochleovestibular anatomy is an important component of the cochlear implant evaluation. The objective of the study was high resolution computerized tomography (HRCT) assessment of congenital ear anomalies before cochlear implantation.</p><p class="abstract"><strong>Methods:</strong> This prospective study was conducted in the Department of Radio diagnosis and Imaging, GMC, Srinagar. 24 children in the age group of 1 to 12 years with unidentified causes of bilateral SNHL were subjected to HRCT over a period of 7 months from January to July 2019.  </p><p class="abstract"><strong>Results:</strong> Eighteen patients had normal radiological scans and 6 had congenital anomalies. We had one each case of common cavity, bilateral labrynthine aplasia, incomplete partition type 1, Mondini’s deformity with dilated vestibular duct, Internal auditory canal stenosis and bilateral large vestibular aqueduct. Out of 18 patients without congenital anomaly, two had Korner’s septum and giant jugular bulb which were important for operating surgeon.</p><p><strong>Conclusions:</strong> HRCT temporal bone is superior at identifying the bony labyrinth, including enlarged vestibular aqueduct and caliber of internal auditory canal. HRCT temporal bone should be supplemented by magnetic resonance imaging especially for cochlear nerve assessment. It is the initial imaging modality of choice for assessment of congenital SNHL. </p>

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