[CT multiplane reconstruction images of superior semicircular canal dehiscence syndrome].
1
Citation
0
Reference
10
Related Paper
Citation Trend
Abstract:
To evaluate the clinical application of multi-planar reformation (MPR) for the diagnosis of superior semicircular canal dehiscence syndrome.A retrospective study was conducted on 9 patients who were diagnosed with SSCD syndrome in the Otology and Skull Base Surgery group of Fudan University. Three radiologists analyzed all the patients' 0.75 mm-collimated axial and coronal images and 0.75 mm-collimated MPR images, and they came up with the same results.There were 18 superior semicircular canal in the 9 patients, of whom 9 were intact and 9 were defective. All the defective superior semicircular displayed a definite dehiscence in all the MPR images, which indicated the sensitivity was 100%; however, 7 of the 9 defective superior semicircular canal were diagnosed as dehiscence in axial images, while 8 of the 9 were diagnosed in coronal images, but the sensitivities were 77.8% and 88.9% respectively. The results of the other 9 with intact superior semicircular canal displayed in the MPR, axial, and coronal images were also different. In the MPR images, they all displayed definite intact roof over the superior semicircular canal. There were 2 dehiscence in all axial and coronal images, and the specificities were 77.8%.The MPR image is more useful in diagnosis of superior semicircular canal dehiscence syndrome than that of the routine axial and coronal images.Keywords:
Facial canal
Cite
The relatively new clinical entity superior canal dehiscence syndrome (SCDS) is diagnosed by clinical symptoms and signs. Coronal computed tomography (CT) has been used to confirm the diagnosis. A consecutive series of temporal bone CT scans was reviewed to define the prevalence of a dehiscent-appearing superior semicircular canal.Temporal bone CT scans performed over a 2-year period at a university-based tertiary referral center were reviewed independently by 3 individuals. Scans were excluded if coronal images were not obtained or reconstructed from axial images. Prevalence figures for dehiscent-appearing superior semicircular canal were determined by consensus. Medical records of selected individuals with a dehiscent-appearing canal were reviewed for study indications and otologic symptoms.A dehiscent-appearing superior semicircular canal was seen in 9% of studies. Correlation among examiners was greater than 94%. Medical records indicated symptoms suggestive of or compatible with the diagnosis of SCDS in rare cases.The prevalence of a dehiscent-appearing superior semicircular canal on coronal CT of the temporal bones performed with 1.0-mm collimation is substantially greater than that predicted by temporal bone histologic study. Clinical symptoms compatible with the diagnosis were seldom recorded, suggesting low specificity. The high sensitivity and low specificity of CT scan create a risk for overdiagnosis of SCDS if the coronal CT scans are not correlated with clinical symptoms.
Facial canal
Cite
Citations (138)
Oscillopsia
Posterior Semicircular Canal
Facial canal
Cite
Citations (14)
Estimated are: 1. The axis of the internal acoustic meatus to the horizontal plane in adults and postnatal changes. 2. Eight coronal sections of the temporal bone have been selected to localize the canal systems and structures in the petrous part of the temporal bone and their variations. 3. Described are the different parts of the facial canal, the carotic canal, the auditive tube, the tensor tympani muscle, the major petrosal nerve, and its distances to the carotic canal, the cochlea, the internal acoustic meatus, the supra- and infracochlear cells, the fenestra vestibuli, the fossa jugularis, the canaliculus cochleae, the vestibulum and the semicircular canals. This report includes the development of the supravestibular and other mastoideal cells in the neighbourhood of the canal systems of the petrous bone and the vestibular aqueduct and sac. Estimated are also the distances between the different canal systems. 4. The investigations are discussed with our earlier researches and the results of other researchers and its diagnostic in clinical importance.
Facial canal
Meatus
Vestibular aqueduct
Posterior Semicircular Canal
Membranous labyrinth
Saccule
Eustachian tube
Cite
Citations (1)
The study of the association between superior semicircular canal and other dehiscences in the temporal bone.We have studied computed tomography of radiologically diagnosed people with superior or posterior semicircular canal dehiscences, in four health centres. In addition, we have studied one isolated human temporal bone, one skull and one cadaver head belonging to the collection of the Department of Human Anatomy and Histology of the University of Zaragoza that had dehiscence in the superior semicircular canal.The most frequent association that we observed was between superior semicircular canal dehiscence and tegmen tympani dehiscence (37.33%). Three cases (two clinical cases and one isolated temporal bone) showed multiple associated dehiscences (tegmen tympani, mastoid antrum, posterior semicircular canal, internal auditory canal, glenoid cavity, tympanum bone and geniculate ganglion) associated with superior semicircular canal dehiscence.When the superior semicircular canal dehiscence is associated to other in the petrous bone (tegmen tympani, mastoid antrum, posterior semicircular canal, internal auditory canal) could be grouped into the same syndrome called "otic capsule syndrome", since they have the same origin and common aetiology (otic capsule).
Posterior Semicircular Canal
Facial canal
Cite
Citations (7)
Facial canal
Malleus
High-resolution computed tomography
Incus
Sigmoid sinus
Bone erosion
Cite
Citations (12)
Abstract This is the first complete report on the histopathologic study of the temporal bones from an infant with a well‐documented Pierre Robin syndrome (micrognathia, glossoptosis and cleft palate), demonstrating multiple middle and inner ear anomalies. The anomalies are basically architectural malformations rather than neural or end organ developmental anomalies. The anomalies in this case, except for a few points, are somewhat similar in both ears. Multiple anomalies include: abnormal narrowing of the cms commune‐utricle junction, superiorly located cms commune and posterior semicircular canal, underdeveloped modiolus, absence of the bony septum between the middle and apical coil (existence of scala communis in left ear), abnormally small internal auditory meatus, and abnormal direction of internal auditory canal, large cartilaginous mass around the superior semicircular canal and in the tympanic end of the fissula ante fenestram, small facial nerve, large facial bony canal dehiscence, anomalic stapes, etc.
Facial canal
Utricle
Modiolus (cochlea)
Meatus
Membranous labyrinth
Vestibular aqueduct
Cite
Citations (29)
Internal auditory meatus
Posterior Semicircular Canal
Ampulla
Neuroradiology
Facial canal
Meatus
Cite
Citations (12)
The morphology of macrosections of the normal adult temporal bone were correlated with high resolution computed tomographic findings of 6 axial, coronal and sagittal sections.1) The micro-structure of the temporal bone was almost perfectly demonstrated by axial, coronal and sagittal sections. Axial sections provided more information on the structure of the temporal bone than did coronal sections. Sagittal sections gave little information.2) Axial sections effectively demonstrated the facial nerve canal (labyrinthine segment-geniculate ganglion-tympanic segment), majorr petrous nerve canal, short process of the incus, stapes (especially foot plate), and relationship of the malleus head to the incus body.3) Coronal sections were useful in demonstrating the cochlear aqueduct, facial nerve canal (mastoid segment), crista transverse, tensor tympani and ossicle (incus body, incus long process, stapes head, stapes crus).4) Sagittal sections were useful in demonstrating, the facial nerve canal (tympanic segment, mastoid segment), vestibular aqueduct, and the relationship of the malleus head to the incus long process.5) To understand the complicated structure of the temporal bone it was necessary to perform CT in many dimensions. The most useful section was the axial. Coronal and sagittal sections were sometimes useful.
Incus
Malleus
Geniculate ganglion
Facial canal
Vestibular aqueduct
Cite
Citations (0)
Surgical access to repair a superior canal dehiscence (SCD) is influenced by the location of the bony defect and its relationship to surrounding tegmen topography as seen on computed tomography. There are currently no agreed-upon methods of characterizing these radiologic findings. We propose a formal radiologic classification system of SCD based on dehiscence location and adjacent tegmen topography.Retrospective case reviewTertiary, neurotology referral centerWe identified 298 patients with superior canal dehiscence on CT from February 2001 to October 2013. Of these, 251 had symptomatic superior canal dehiscence syndrome and were included in the study.Patients underwent high-resolution temporal bone CT scans with creation of axial, coronal, Pöschl, and Stenver reformatted images to examine the superior semicircular canal. Two residents-in-training and a head and neck radiologist independently read the scans.CT scans were assessed for (1) superior canal dehiscence or "near" dehiscence, (2) defect location relative to the skull base, (3) surrounding tegmen defects, (4) geniculate ganglion dehiscence, (5) superior petrosal sinus-associated dehiscence (SPS), (6) low-lying tegmen, and (7) the distance between the outer table of the temporal bone and the arcuate eminence.
Facial canal
Neurotology
Cite
Citations (64)
To evaluate mastoid pneumatisation and facial canal dimensions.In this retrospective study, 169 multidetector computed tomography scans of temporal bone were reviewed. Facial canal dimensions were evaluated at the labyrinthine, tympanic and mastoid segments using axial and coronal multidetector computed tomography scans of temporal bone. Mastoid pneumatisation and facial canal dehiscence were evaluated. Facial canal dehiscence was measured if it was found to be present.This study showed that facial canal dimensions decreased in pneumatised mastoids. Facial canal dimensions in females were smaller than in males. Facial canal dehiscence was detected in 5.9 per cent and 6.5 per cent of the patients on the right and left sides, respectively. No correlations were found between facial canal dehiscence and mastoid pneumatisation. The length of dehiscence was 1.92 ± 0.44 mm (range, 0.86-2.51 mm) on the left side. In older subjects, left facial canal dehiscence was detected more, and the length of the dehiscence increased.This study concluded that during surgery, facial canal dehiscence should be kept in mind in order to avoid complications.
Facial canal
Medial wall
Cite
Citations (2)