Interaction effect of tegmen tympani and superior semicircular canal statuses on the thickness of the roof of the glenoid fossa: a cross-sectional descriptive study

Whyte, J; Fraile, J.; Whyte, Ana; Crovetto, Rafael; Monteagudo, L. V.; Crovetto, Miguel Ángel; Tejedor, María Teresa

doi:10.1007/s00276-019-02358-w

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…Superior semicircular canal dehiscence (SCD) results from a bony defect in the otic capsule overlying the superior semicircular canal, thought by many to result from a congenital defect in otic capsule development due to the radiographic presence of SCD in 1.7 to 2.8% of pediatric patients (14,15). Interestingly, concurrent tegmen tympani or tegmen mastoideum defects are commonly found in radiographic analyses of subjects with radiographic SCD (2,7,16), which have led some investigators to postulate that attenuated lateral skull base bone and deficient otic capsule bone are perhaps part of the same developmental mechanism (7,8,17). This study adds further supporting evidence that tegmen dehiscences are common in subjects with SCD, though these findings are unique among the literature that has investigated this relationship as it includes a large number of subjects with tegmen defects that were confirmed at the time of surgery.…”

Section: Discussionmentioning

confidence: 99%

“…Over two decades of experience in surgically treating SCDS at our institution has allowed us to intraoperatively observe that a substantial number of patients with SCDS also harbor thin or dehiscent tegmen tympani and/or tegmen mastoideum, an observation that might implicate a more diffuse thinning of osseous structures in the lateral skull base as opposed to an isolated otic capsule defect. These observations are supported by several reports suggesting that SCD arises from those who are congenitally predisposed to underdevelopment of otic capsule bone (7,8). Despite previous reports identifying obstructive sleep apnea (OSA) and obesity or elevated body mass index (BMI) as risk factors for cerebrospinal fluid (CSF) leaks from lateral skull base defects (9,10), no report exists that comprehensively assesses predictors of confirmed tegmen defects visualized via middle fossa craniotomy during surgical repair of SCD.…”

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confidence: 89%

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Predictive Factors for Concurrent Tegmen Dehiscence in Superior Canal Dehiscence Syndrome

Formeister¹,

Zhang²,

Dent

et al. 2022

Otology &Amp; Neurotology

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Objectives:To describe factors predictive of tegmen dehiscence in subjects with superior semicircular canal dehiscence syndrome (SCDS).Study Design:Retrospective case series.Setting:Tertiary referral center.Patients:Subjects with SCDS who underwent middle fossa craniotomy (MFC) for plugging/resurfacing.Main Outcome Measures:Operative and radiographic findings of tegmen dehiscences, preoperative low frequency air-bone gaps (LF-ABGs), ocular vestibular evoked myogenic potential (oVEMP) amplitudes, size of superior semicircular canal dehiscence (SCD), and history of obesity or obstructive sleep apnea (OSA).Results:One hundred thirty six patients (avg. age, 50.6 yr, 55.1% female) underwent MFC for repair of SCDS. Tegmen dehiscences were commonly found intraoperatively (tegmen tympani dehiscence [TTD] in 19.9% [11% with dural contact of ossicles], tegmen mastoideum dehiscence [TMD] in 28.7%). There were no differences in preoperative LF-ABGs and preoperative oVEMP amplitudes with respect to tegmen status. The sensitivity and specificity of computed tomography (CT) for predicting an intraoperatively confirmed TTD was 85 and 74%, respectively, and 44 and 79% for TMD. History of obesity and OSA did not differ between those with and without tegmen dehiscences. The presence of contralateral SCD and increasing cross-sectional area of SCD were both significantly associated with concurrent tegmen defects.Conclusions:Obesity, OSA, preoperative oVEMP, and LF-ABG do not differ between those with SCD alone and those with SCD and concurrent tegmen dehiscences. Likewise, CT scans have relatively low sensitivity for identifying tegmen dehiscences. The presence of concurrent tegmen defects is more common in subjects with larger SCD cross-sectional areas and contralateral SCD.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 89%

Predictive Factors for Concurrent Tegmen Dehiscence in Superior Canal Dehiscence Syndrome

Formeister¹,

Zhang²,

Dent

et al. 2022

Otology &Amp; Neurotology

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“…Two studies conducted in 2018 and 2020 confirmed the relationship between the dehiscence of the RGF and SSCD [ 22 , 23 ], to explain this relationship, Crovetto et al recommended a connection in the embryological development of these structures [ 22 ]. Moreover, Whyte et al also found a significant interaction outcome of TT and SSC statuses on RGF thickness [ 37 ].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Superior Semicircular Canal Morphology and Its Relationship with Glenoid Fossa Roof Thickness Using Cone Beam Computed Tomography

Davvaz

Hasani

Haghnegahdar

2022

Radiology Research and Practice

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Purpose. This study aimed to evaluate the bone thickness of the superior semicircular canal (SSC) roof and its relationship with the roof thickness of the glenoid fossa (RGF). Methods. The cone beam computed tomography (CBCT) images of 280 patients (560 temporal regions) were surveyed. The lowest thickness of the SSC roof was measured and categorized based on the radiological patterns of the Cisneros et al. classification. The thickness of GF and the presence of dehiscence in this part were determined, as well. The relationship between the thickness of the GF roof and the bone thickness covering the SSC was also assessed. Results. The mean thickness of the SSC roof was 0.93 ± 0.48 mm, with no significant difference among different age groups and genders ( p > 0.05 ). However, superior semicircular canal dehiscence (SSCD) was more prevalent among females over 45 years old. Similarly, the individuals with the dehiscence of the GF roof had a 12.93-fold higher chance of SSCD development. Conclusions. The results indicated that the thickness of the bone overlying the SSC was significantly related to the roof thickness of the GF. However, an increase in age resulted in no significant change in the bone thickness of the SSC roof. Gender also had no role in changing the thickness of the bone overlying the SSC. Considering the decrease in the thickness of the SSC roof among females over 45 years of age, menopause may be responsible for this occurrence as well as for the increase in the prevalence of SSCD.

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“…22 Dehiscence of the superior semicircular canal and tegmen tympani have also been associated with other temporal bone abnormalities such as dehiscence of the root of the glenoid fossa. 23 There is controversy as to whether SSCD is congenital or acquired. It has been postulated that SSCD results from a failure of postnatal bony development over the superior semicircular canal.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Dural Contact to the Malleus Head in Patients with Superior Semicircular Canal Dehiscence (SSCD): Case Series and Review of SSCD and Tegmen Defects

Wentland

Cousins

May

et al. 2021

Ann Otol Rhinol Laryngol

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Objective: Report a series of cases in which patients have concomitant superior semicircular canal dehiscence (SSCD) and a dehiscent tegmen tympani with Dural contact to the malleus head (DCMH). Methods: An analysis of radiologic and audiologic data in 4 patients who presented with SSCD and DCMH at a tertiary care institution. A pertinent literature review was performed. Results: Four patients (5 ears) had SSCD and DCMH. In 3 patients with unilateral DCMH, the mean maximum air-bone gap was 15 dB in the ear with DCMH compared to 50 dB in the ear without DCMH. Of the 5 ears with DCMH, the mean air conduction threshold at 250 Hz was 17 dB compared to 42 dB in the 3 ears without DCMH. Conclusions: We report the findings of DCMH in a series of 4 patients with bilateral SSCD. This limited series suggests that ears with SSCD and DCMH have less of an air-bone gap than would be expected, as 1 would expect an additive effect of DCMH and SSCD on the air-bone gap.

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Interaction effect of tegmen tympani and superior semicircular canal statuses on the thickness of the roof of the glenoid fossa: a cross-sectional descriptive study

Cited by 5 publications

References 17 publications

Predictive Factors for Concurrent Tegmen Dehiscence in Superior Canal Dehiscence Syndrome

Predictive Factors for Concurrent Tegmen Dehiscence in Superior Canal Dehiscence Syndrome

Evaluation of Superior Semicircular Canal Morphology and Its Relationship with Glenoid Fossa Roof Thickness Using Cone Beam Computed Tomography

Dural Contact to the Malleus Head in Patients with Superior Semicircular Canal Dehiscence (SSCD): Case Series and Review of SSCD and Tegmen Defects

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