| CM-I | Chiari malformation type I |
| CCF | craniocervical fixation |
| CCJ | craniocervical junction |
| CDU | color Doppler ultrasonography |
| CSF | cerebrospinal fluid |
| C1/2 FIX | atlanto–axial posterior lateral fixation |
| ESCP | expansive suboccipital cranioplasty |
| FMD | foramen magnum decompression |
| OCF | occipito–cervical posterior lateral fixation |
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