This study uses superior semicircular canal dehiscence (SSCD) volumetry to measure the size of SSCD. The authors imported high-resolution computed tomographic images of the temporal bone into segmentation software. They measured the dehiscence lengths and volumes on coronal images (instead of reformatted coronal oblique images used in other studies) and studied the relationship between dehiscence size and pre and postoperative symptoms. Patients with dehiscence lengths greater than 2.5mm were observed to present with cochleovestibular symptoms. Improved dizziness after surgery and dehiscence length were found to be associated. The authors conclude that although their study had a low power, SSCD volumetry allows for comprehensive dehiscence evaluation. Their study has limitations as reformatted coronal oblique images available for measurement of SSCD and the low power of their study does not help substantiate SSCD volumetry as a predictor of symptom outcomes.

Novel method of measuring canal dehiscence and evaluation of its potential as a predictor of symptom outcomes after middle fossa craniotomy.
Lagman C, Beckett JS, Chung LK, et al.
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Gauri Mankekar

Department of Otolaryngology-Head Neck Surgery, Louisiana State University Shreveport, Louisiana, USA.

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