PMC9731870_01
Lateral radiograph of cervical spine on neutral position showed that posterior subluxation of atlantoaxial joint associated with os odontoideum.
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Lateral radiograph of cervical spine on neutral position showed that posterior subluxation of atlantoaxial joint associated with os odontoideum (Fig. 1).
T2-weighted MR image of the cervical spine revealed posterior subluxation of the atlantoaxial joint and spinal cord compression at C1-2.
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T2-weighted magnetic resonance imaging (MRI) revealed posterior subluxation of the atlantoaxial joint and spinal cord compression at C1 level (Fig. 2).
A, Posterior view on three-dimensional CTA showing bilateral persistent first intersegmental artery (black arrow). B, Left reconstructed parasaggital image on CTA revealing high riding VA (white arrow).
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Three-dimensional computed tomography angiography (CTA) of cervical spine showed bilateral vertebral arteries running just below the C2 pedicle (PFIA) and left reconstructed parasagittal image on CTA revealed left side HRVA (Fig. 3).
Postoperativel lateral radiograph of cervical spine on neutral position showed the occipitothoracic fixation (O-T4) with mild cervical flexion.
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After cortical bone stripping from the occipital bone to the thoracic spine, the iliac and local bones were grafted (operated by H.S.) (Fig. 4).
The MRI taken three months postoperatively confirmed adequate spinal cord decompression at C1 level.
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The MRI taken three months postoperatively confirmed adequate spinal cord decompression at C1 level (Fig. 5).