Introduction

In the previous research we developed a new method to evaluate LVA/large endolymphatic sac anomaly (LESA) using CT/digital volume tomography (DVT)/MRI images. The primary goal of our study is to apply the previously developed method in control group and compare the results with LVA/LESA patients. Moreover, to propose a new definition of LVA and the clinical course for the hearing loss based on largest known data set.

Methods

Retrospective analysis of radiological images was performed on the patients, who were diagnosed with LVA/LESA based on CT/DVT and/or MRI images of the temporal bone. The following measurements were performed on both modalities: orifice, length, external aperture measurements of vestibular aqueduct/endolymphatic duct and sac. Additional measurements like volume of extraosseus endolymphatic sac, maximal contact diameter of the dura mater and extraosseus endolymphatic sac in the axial pictures were taken on MRI images. The measurements were performed in the control and LVA groups.

Results

315 ears in LVA group and 200 ears in control group. The radiological measurements in both groups were compared.

Conclusions

We support the idea that CT/DVT scan can be performed as a screening for the diagnosis. The MRI of temporal bone can confirm the diagnosis.Moreover, the MRI imaging can help to confirm or exclude the edge cases.

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