Dehiscence measurement in FIESTA MRI and high-resolution CT
| Cases of Superior/Posterior Semicircular Canal Dehiscence | MRI (mm) | CT (mm) |
|---|---|---|
| On MRI and CT | ||
| SSCD1 | 5.1 | 3.6 |
| SSCD2 | 3.2 | 1 |
| SSCD3 | 7 | 3.8 |
| SSCD4 | 2.9 | 2,5 |
| SSCD5 | 3.3 | 2 |
| SSCD6 | 5 | 2.8 |
| SSCD7 | 1.7 | 2.5 |
| SSCD8 | 2.6 | 3.5 |
| SSCD9 | 4.6 | 3.7 |
| SSCD10 | 4.3 | 1.5 |
| SSCD11 | 4.3 | 1 |
| PSCD1 | 1,5 | 1.5 |
| Mean dehiscence length (mm) | 3.8a | 2.5 |
| P value | .009 | |
| On FIESTA only | ||
| SSCD12 | 4.1 | No dehiscence |
| SSCD13 | 4.4 | No dehiscence |
| SSCD14 | 2.3 | No dehiscence |
| SSCD15 | 2.6 | No dehiscence |
| SSCD16 | 4.2 | No dehiscence |
| SSCD17 | 1.1 | No dehiscence |
| SSCD18 | 4.2 | No dehiscence |
| PSCD2 | 1.5 | No dehiscence |
| PSCD3 | 1.7 | No dehiscence |
| Mean dehiscence length (mm) | 2.9a |
Note:—SSCD indicates superior semicircular canal dehiscence; PSCD, posterior semicircular canal dehiscence.
↵a Mean dehiscence length on FIESTA when present on CT was 3.9 mm. Mean dehiscence length on FIESTA when absent on CT was 2.9 mm. The difference between these 2 values is not statistically significant (P = .18).