Table 2.
MRI Characteristics of Chiari I Malformation patients with Scoliosis
| Syrinx (N=18) | No Syrinx (N=18) | P-Value* | |
|---|---|---|---|
| Tonsillar Herniation (mm) | 9.1 ± 3.0 | 9.9 ± 4.1 | 0.570 |
| Grade I | 8 (44%) | 11 (61%) | 0.195 |
| Grade II | 8 (44%) | 3 (17%) | |
| Grade III | 2 (11%) | 3 (17%) | |
| Tonsillar Symmetry** | |||
| Symmetric | 6 (46%) | 6 (43%) | 0.690 |
| Asymmetric: R dominant | 2 (15%) | 4 (29%) | |
| Asymmetric: L dominant | 5 (38%) | 4 (29%) | |
| Odontoid pb-C2 (mm) | 4.2 ± 1.6 | 3.9 ± 1.9 | 0.624 |
| CXA | 150° ± 13.8° | 151° ± 12.0° | 0.741 |
| Syrinx Diameter (mm) | 9.0 ± 2.7 | -- | |
| Syrinx Length (levels) | 13 ± 5 | -- |
CXA indicates clival canal angle
*
Fisher’s exact test used for categorical variables, independent-samples t test for continuous variables
**
Not all patients had available coronal imaging for determination of tonsillar dominance. Sum does not equal