Prediction of facial nerve fronting with temporal bone high resolution computed tomograph

Objective:To report a new CT measurement to predict the exposure of round window niche during facial nerve recess surgery. Methods:Forty CT scans were measured by conventional facial-round window line and limiting facial-round window line method, and compared with the exposure of round window niche after the opening of the facial recess. Results:There was no significant difference in the sensitivity and specificity of the two CT measurement methods to predict the exposure degree of the round window niche, and the Kappa consistency test of the two methods also showed a strong correlation. Conclusion:The new measurement method can predict the exposure of the round window niche pre-operation, and in practice, it can predict the maximum exposure of the round window niche.