Is there any relationship between unilateral vestibular neuritis and internal acoustic canal measurements?

Objectives: In this study, we aimed to compare the internal acoustic canal IAC measurements of the affected and unaffected sides of patients with unilateral vestibular neuritis VN on magnetic resonance imaging MRI . Patients and Methods: January 2017 and December 2019, a total of 120 patients 65 males, 55 females; mean age 58.3±12.5 years; range, 21 to 83 years who were diagnosed with VN according to clinical findings, video head impulse test vHIT , and MRI findings were enrolled in this study. All measurements were performed on the axial constructive interference in steady state CISS sequences. The IAC inlet, mid-canal, and outlet widths were measured at the most distinctive cross-section of the facial nerve and superior vestibular nerve bifurcation. While calculating the length of IAC, the points were taken on the basis of where the inlet and outlet widths of the canal were measured. Results: According to the vHIT results, a single semicircular canal SCC was affected in 102 85% patients, while more than one SCC was affected in 18 15% patients. The inlet, mid-canal and outlet values of the affected side were significantly lower than those of the unaffected side p0.05 . All of these parameters were slightly higher in males; however, this difference was not statistically significant p>0.05 . Conclusion: Our study results showed that the widths of the IAC were lower in the affected side of patients with unilateral VN. These findings may help to explain why acute VN cases occur only unilaterally, suggesting that a small sectional diameter of the IAC is a potential risk factor for VN.

Keywords:

Internal acoustic canal, magnetic resonance imaging vestibular neuritis, video head impulse test.,

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