Table 2.
| MRI feature | Hassan et al. [5] (2012): no. (%) | Sonwalkar et al. [18] (2008): no. (%) | Raval et al. [24] (2010): no. (%) |
|---|---|---|---|
| Total number of patients | 11* | 8 | 9 |
| Neutral position | |||
| Abnormal cervical curvature (loss of cervical lordosis) | 10/11 (91) | 6 (75) | 9 (100) |
| Localised lower cervical cord atrophy | 9/11 (82) | 8 (100) | 9 (100) |
| Asymmetric cord flattening | 11/11 (100) | 6 (75) | 9 (100) |
| Intramedullary hyperintensity in lower cervical cord | 2 (18) | 3 (37) | 4 (44) |
| Flexion position | |||
| Loss of attachment between posterior dural sac and subjacent lamina | 9/10 (90) | 4 (50) | 9 (100) |
| Anterior shifting of posterior cervical dural wall on flexion | 9/10 (90) | 6 (75) | 9 (100) |
| Prominent epidural flow voids | 9/10 (90) | 4 (50) | 4 (44) |
| Enhancing epidural mass in lower cervical region | 10/10 (100) | 6 (75) | 9 (100) |
*11 patients underwent routine neutral position MRI, and 10 underwent flexion contrast MRI.