Bilateral Ossicular Head Dehiscence Into the Middle Cranial Fossa

Alvi, Sameer; Jones, Joel; Lin, Jim

doi:10.1177/0003489417751956

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Based on the present study, surgery simulations can be carried out using the CAD module by inputting the ossicles' HRCT data with lesions or defects (14). Either mirror imaging or the use of the normal ossicular morphology as a standard can then be employed for the virtual realization of the anatomical repair of the defective malleus, incus, or even stapes (15)(16)(17)(18). The application of suitable ossicular prosthesis materials in TDP rapid prototyping for the accurate repair of the ossicles is expected to change conventional ossicular reconstruction's current status, making it less time-consuming and effort-intensive, and more accurate.…”

Section: A B C Dmentioning

confidence: 99%

Accuracy of individualized 3D modeling of ossicles using high-resolution computed tomography imaging data

Zhao

Lu²,

Zou

et al. 2021

Quant Imaging Med Surg

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Background: The present study aimed to investigate the visibility of small ossicle parts/landmarks on high-resolution computed tomography (HRCT)/3D reconstruction (3D) to investigate what improvements in scanning resolution are needed before accurate 3D printing of patient-specific ossicles is possible.Methods: A total of 24 patients with sudden deafness sought consultation at the Department of Otorhinolaryngology Head and Neck Surgery at the Sixth Medical Center of People's Liberation Army General Hospital between October 2013 and June 2014 were enrolled in the study. All participants underwent a 256-slice spiral HRCT temporal bone axial scan, yielding a Digital Imaging and Communications in Medicine documents series. These documents were then inputted into Mimics 16.0 interactive medical image processing software for data conversion and the creation of 3D segmentation and visualizations of the ossicles. Finally, the 3D images were compared using multiplanar reformation (MPR) and 3D volume-rendering (VR) reconstructed images of ossicles to verify their consistency. These were then compared with the normal ossicle structure to evaluate the accuracy of the restoration. Results:The findings indicated that the morphology of the ossicles from the converted Mimics 16.0 data achieved a display rate of ≥90% when used to display 7 landmarks (the caput mallei, collum mallei, processus lateralis mallei, manubrium mallei, corpus incudis, crus longum incudis, and crus breve incudis). This demonstrates excellent matching with the images of ossicles obtained from MPR and 3D VR reconstruction. Kappa consistency testing found that the κ-value was higher than 0.75. When displaying the lenticular process, caput stapedis, crus anterius stapedis, and crus posterius stapedis landmarks. The display rate was around 60%, which shows good matching with the ossicles' images obtained from MPR and 3D VR reconstruction, with a κ-value >0.4. However, the display rate of the stapes footplate was only 25%, showing greater differences with the images obtained from MPR (76.4%) and 3D VR reconstruction (52.8%), with a κ-value <0.4. Conclusions:The accuracy of the visualization of the malleus and incus after restoration via Mimics 16.0 software, based on temporal bone HRCT data, was high, and the degree of restoration was good. However, the accuracy and degree of restoration of the stapes footplate require further improvement.

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Section: A B C Dmentioning

confidence: 99%

Accuracy of individualized 3D modeling of ossicles using high-resolution computed tomography imaging data

Zhao

Lu²,

Zou

et al. 2021

Quant Imaging Med Surg

View full text Add to dashboard Cite

show abstract

“…16,17 Conductive hearing loss has been associated with tegmen defects, ossicular head dehiscence into the middle crania fossa, or cerebral spinal fluid leakage. 17,18 The authors have found an interesting radiologic trend in patients with SSCD on CT: the tegmen is often low lying and dehiscent with the head of the malleus contacting the middle fossa dura. Reports describing the hearing patterns in patients who have SSCD in addition to Dural contact to the malleus head (DCMH) are rare.…”

Section: Introductionmentioning

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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Bilateral Ossicular Head Dehiscence Into the Middle Cranial Fossa

Abstract: We present some of the unique imaging and operative findings involved in an unusual presentation of encephalocele in which the bilateral malleus and incus heads rise above the level of the middle fossa floor.

Cited by 2 publications

References 9 publications

Accuracy of individualized 3D modeling of ossicles using high-resolution computed tomography imaging data

Accuracy of individualized 3D modeling of ossicles using high-resolution computed tomography imaging data

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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