Prevalence of otic capsule dehiscence in temporal bone computed tomography scan

Zarandy, Masoud Motasaddi; Kouhi, Ali; Emami, Hamed; Amirzargar, Behrooz; Kazemi, Mohammad

doi:10.1007/s00405-022-07464-x

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…In fact, other OCD variants than SSCD are far from being systematically searched for in the current radiological practice, despite the obvious presence of a TMWS. This can be easily explained because most of the articles communicated or published in the past 20 years have almost exclusively focused on SSCD, although the incidence of these OCD variants is not necessarily lower ( 13 ).…”

Section: Introductionmentioning

confidence: 99%

Why should multiple dehiscences of the otic capsule be considered before surgically treating patients with superior semicircular canal dehiscence? A radiological monocentric review and a case series

et al. 2023

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This review aims to draw attention to the multiple ipsilateral otic capsule dehiscences (OCDs), which may cause therapeutic failure in operated patients. A series of six severely disabled patients with symptoms and signs consistent with a superior semicircular canal dehiscence (SSCD) diagnosis, confirmed by a high-resolution CT scan, is presented here. Five of the patients underwent surgery, and in four of the cases, the postoperative results were poor and/or disappointing. The ethical principles underlying modern medicine encourage medical staff to learn from past experience even when the results are modest despite the accuracy of the treatment applied to a patient. Consequently, we reviewed the radiological records of symptomatic and asymptomatic patients diagnosed or referred to our center for confirmation over the past 5 years to determine the incidence of multiple OCD in this population. Multiple localizations of suspected OCD in the ipsilateral ear did not appear to be rare and were found in 29 of 157 patients (18.47%) in our retrospective review using high-resolution thin-sliced CT scans. The decision to perform surgery for a documented symptomatic superior SSCD should be made with caution only after ruling out concomitant lesser-known variants of OCD in the ipsilateral ear.

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Section: Introductionmentioning

confidence: 99%

Why should multiple dehiscences of the otic capsule be considered before surgically treating patients with superior semicircular canal dehiscence? A radiological monocentric review and a case series

et al. 2023

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“…In the largest radiographic series to date, Motasaddi Zarandy et al evaluated 600 patients using CT scans of all planes and required the dehiscence to be present on at least two consecutive images. 11 They found a CFD rate of 6.3%. The lower incidence in this evaluation may be from requiring the dehiscence to span at least two sections.…”

Section: Discussionmentioning

confidence: 97%

“…The lower incidence in this evaluation may be from requiring the dehiscence to span at least two sections. 11 The only histologic study to date demonstrates a lower incidence for CFD when compared with imaging studies. A review of more than 1,000 temporal bone specimens identified an anatomical dehiscence rate of 0.59% but found 35% of patients had a thin enough bony partition of 0.1 mm to appear dehiscent on CT images.…”

Section: Discussionmentioning

confidence: 99%

A CT Radiologic Assessment of the Incidence of Cochlear–Facial Dehiscence and the Thickness of Bone between the Cochlea and Facial Nerve among Normal Temporal Bones

Nayeri,

Gopen

2024

J Neurol Surg B Skull Base

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Cochlear-facial dehiscence is a relatively new diagnosis which occurs when the bony partition between the labyrinthine segment of the facial nerve and the cochlea is dehiscent. This is considered one of several third window lesions which produce varying degrees of auditory and vestibular symptoms. Imaging studies have identified a consistently higher incidence of cochlear-facial dehiscence when compared to the only histopathologic study present in the literature. This research effort adds to the literature using uniform CT scan images across over 226 ears (114 patients) to identify the radiographic incidence of cochlear-facial dehiscence in normal patients without ear pathology or symptoms. This study identified an incidence of 18.1% of the ears analyzed having dehiscence without any correlation to age or gender. When dehiscence was not identified, the mean thickness of bone between the cochlea and the facial nerve was 0.60 +/- 0.24mm.

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“…In 2016, Wackym et al coined the term "otic capsule syndrome" to define the existence of associated dehiscences between any of the semicircular canals (superior, posterior or lateral) [ 14 ], and in 2020, Whyte et al expanded this term to include multiple other dehiscences of structures derived from the otic capsule, such as the tegmen tympani, mastoid antrum, posterior semicircular canal, internal auditory canal or Fallopian aqueduct [ 15 ]. In 2023, Zarandy et al studied the different types of dehiscences of the otic capsule and found a 6 and 2.7% prevalence of dehiscences of the superior and posterior semicircular canals, respectively; that of cochlear–facial dehiscence was 6.3%, that of the cochlea with the auditory canal was 0.7%, that of the cochlea with the carotid canal was 0.7%, that of dehiscence of the jugular bulb and aqueduct was 6.3% and that of the jugular bulb with the posterior semicircular canal was 0.2% [ 16 ]. When analysing this information, we found no mention of the link between tegmen dehiscence and superior semicircular canal dehiscence, despite this being the most prevalent presentation.…”

Section: Discussionmentioning

confidence: 99%

Association of the superior semicircular canal and tegmen tympani dehiscences and its relationship with the pneumatisation of the temporal bone

Whyte-Orozco,

Cisneros-Gimeno,

García-Barrios

et al. 2023

Eur Arch Otorhinolaryngol

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Purpose To analyse the degree of pneumatisation of the temporal bone when there is an association between dehiscence of the superior semicircular canal and dehiscence of the tegmen tympani. Materials and methods We analysed a retrospective CT study of 124 selected cases. A single inclusion criterion was applied: the presence of a dehiscence of the tegmen tympani. On the other hand, the degree of temporal pneumatisation was assessed by axial and coronal planes, and has been divided into the following grades O, I, II and III, according to the status and relationship of the mastoid, the bony labyrinth, the petrous segment of the carotid canal and sigmoid sinus. Results Of the 124 cases studied, 35 (28.2%) presented both dehiscences. In 26 of the 35 (47.3%), grade II pneumatisation, 4 (14,8%), grade I, and 5 (11,9%) grade III was observed, with a statistically significant relationship (p < 0.001). On the other hand, we did not find a significant relationship when relating both dehiscences in any age or sex group. However, when relating the degree of pneumatisation to sex, among those with grade III pneumatisation, the proportion of men (52.4%) was significantly higher than that of women (47.6%) (p = 0.017). Conclusion We have detected a statistically significant relationship between the coexistence of grade II pneumatisation and the presence of both dehiscences in the temporal bone.

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Prevalence of otic capsule dehiscence in temporal bone computed tomography scan

Cited by 5 publications

References 25 publications

Why should multiple dehiscences of the otic capsule be considered before surgically treating patients with superior semicircular canal dehiscence? A radiological monocentric review and a case series

Why should multiple dehiscences of the otic capsule be considered before surgically treating patients with superior semicircular canal dehiscence? A radiological monocentric review and a case series

A CT Radiologic Assessment of the Incidence of Cochlear–Facial Dehiscence and the Thickness of Bone between the Cochlea and Facial Nerve among Normal Temporal Bones

Association of the superior semicircular canal and tegmen tympani dehiscences and its relationship with the pneumatisation of the temporal bone

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