Table 3.
Comparison of measurements between patients without syrinx and patients who had syrinx < 50% of AP length of the spinal cord, and between those without syrinx and patients who had syrinx > 50% of the AP length of the spinal cord
| Factor | Without syrinx | Group 1 syrinx | Group 2 syrinx |
|---|---|---|---|
| Age (years), mean ± SD (range) | 36.2 (15-70) | 37 (15-64) p = 0.750 |
34.3 ± 12.0 (15.0-57.0) p = 0.220 |
| TH, mean ± SD (range) | 11.5 ± 2.6 (5-20.2) | 13.3 ± 2.1 (5.0-22.4) p = 0.420 |
14.5 ± 2.3 (7.4-25.4) p = 0.06 |
| M1, mean ± SD (range) | 32.0 ± 3.8 (23.3-45.5) | 33.1 ± 4.9 (20.2-44.2) p = 0.550 |
34.3 ± 4.1 (28.0-46.0) p = 0.428 |
| M2, mean ± SD (range) | 34.1 ± 5.1 (17.3-46.4) | 33.9 ± 5.4 (22.0-43.7) p = 0.945 |
33.8 ± 5.3 (17.5-42.2) p = 0.87 |
| M3, mean ± SD (range) | 54.3 ± 5.3 (40.4-67.4) | 52.3 ± 4.9 (45.0-67.0) p = 0.202 |
56.8 ± 4.6 (38.0-63.8) p = 0.475 |
| M4, mean ± SD (range) | 23.4 ± 4.3 (13-36.5) | 22.9 ± 4.4 (12.9-30.9) p = 0.88 |
23.1 ± 3.9 (13.5-30.0) p = 0.657 |
| M5, mean ± SD (range) | 77.5 ± 5.3 (66-95) | 76.7 ± 7.0 (62.0-90.0) p = 0.22 |
74.8 ± 5.0 (60.0-88.0) p = 0.03 |
| M6, mean ± SD (range) | 36.3 ± 3.3 (30.2-46.5) | 35.5 ± 5.0 (23.3-45.5) p = 0.457 |
34.8 ± 5.1 (27.8-49.8) p = 0.112 |
TH – tonsillar herniation, Group 1 syrinx: S/C ratio was < 50%, M1 – clivus length, M2 – the perpendicular distance between the McRae line and the pons, M3 – the perpendicular distance between the McRae line and the splenium of corpus callosum, M4 – the perpendicular distance between the McRae line and the fastigium of the cerebellum, M5 – AP length of the posterior fossa, M6 – AP length of the foramen magnum, SD – standard deviation