Correlation of mirror image movements with cervical cord clefting
| Grade | 0 | 1 | 2 | 3 | 4 | 5 | ||
|---|---|---|---|---|---|---|---|---|
| Axial imaging appearance | Normal cord | Deformity without cleft | Posterior cleft alone | Anterior cleft with or without posterior cleft | Bow tie configuration | Complete neuroschisis | Cord obscured | Total |
| MM (+) | 0 | 0 | 1 | 2 | 1 | 1 | 1* | 6 |
| MM (−) | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 6 |
| N/E | 1 | 2 | 0 | 0 | 1 | 0 | 0 | 4 |
| Total | 4 | 5 | 1 | 2 | 2 | 1 | 1 | 16 |
Note.—MM indicates mirror movements; N/E, not clinically evaluated.
* Chiari II malformation with posterior cord obscured by tonsillar peg.