Clinical and angiographic characteristics according to the ASIA scale at last follow-upa
| Characteristics | Severe ASIA Scale | Nonsevere ASIA Scale | P |
|---|---|---|---|
| (n = 11) (39) | (n = 17) (61) | ||
| Mean age at onset (yr) | 9.2 ± 6.4 | 10.4 ± 4.3 | NS |
| Male/female | 6:5 | 8:9 | NS |
| Mean follow-up (yr) | 6.0 ± 4.5 | 5.5 ± 4.5 | NS |
| Clinical evaluation | |||
| Back pain | 6 (55) | 12 (71) | NS |
| Tetraplegia | 6 (55) | 1 (6) | .03 |
| Paraplegia | 1 (9) | 2 (12) | NS |
| Sensory deficit | 9 (82) | 10 (59) | NS |
| Respiratory distress | 2 (20) | 2 (12) | NS |
| Sphincter dysfunction | 9 (82) | 9 (53) | NS |
| Severe ASIA score at onset (<D) | 9 (82) | 11 (65) | NS |
| Recurrence of hematomyelia | 7 (64) | 5 (29) | .07 |
| MRI characteristics at onset (n = 22) | |||
| T2 hyperintensity <3 vertebrae (n = 20) | 6 (75) | 8 (67) | NS |
| T1 hypointensity (n =15) | 4 (67) | 2 (22) | NS |
| Angiographic evaluation | |||
| Macroarchitecture | |||
| Fistula | 2 (18) | 5 (29) | NS |
| Nidus | 9 (82) | 12 (71) | NS |
| Site | |||
| Cervical | 7 (64) | 9 (53) | NS |
| Upper thoracic (T1–T7) | 2 (18) | 5 (29) | NS |
| Lower thoracic (T8–conus) | 2 (18) | 3 (18) | NS |
| Cervical and upper thoracic | 9 (82) | 14 (82) | NS |
| Surgical decompression at onset | 2 (18) | 4 (24) | NS |
| Angiographic cure (≥90%) | 7 (64) | 8 (50) | NS |
Note:—NS indicates not significant.
↵a Percentages are shown in parentheses.