PMC10198206_01
Imaging of Case 1 with type 2 AOD. The preoperative CT scans (a and b) and T2 MRI (c) in sagittal view with postoperative radiography (d). AOD: Atlanto-occipital dislocation, CT: Computed tomography, MRI: Magnetic resonance imaging
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F1
C2 to C4 were placed [Figure 1]. Consciousness of the patient improved after surgery.
PMC10198206_02
Case 2 with type 3 AOD. We can see the sagittal view of MRI in STIR (a) and T2 (b) sequences. We can see the final alignment in the postoperative sagittal view of the CT scan (c). In preoperative imaging, Jefferson fracture in axial CT scan (d) and multiple cerebellar hypodensities (e) could be seen. AOD: Atlanto-occipital dislocation, CT: Computed tomography, MRI: Magnetic resonance imaging
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F2
According to MRI images, AOD type 3 was diagnosed [Figure 2].
PMC10198206_03
This figure illustrates Case 3 with type 1 AOD in preoperative reconstructed sagittal CT scan (a) concomitant with hydrocephalus (b) and final postoperation radiograph (c). Syrinx in cervicothoracic spinal cord treated with syringoperitoneal shunt (d is MRI before and e and f after shunt placement). AOD: Atlanto-occipital dislocation, CT: Computed tomography, MRI: Magnetic resonance imaging
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F3
Imaging study revealed a type 1 AOD [Figure 3].
PMC10198206_04
Case 4 with delayed diagnosis of type 1 AOD on axial CT scan (a). The patient underwent craniocervical fixation could be seen in lateral radiograph (b) with delayed hydrocephalus in a follow-up brain CT scan (c). AOD: Atlanto-occipital dislocation, CT: Computed tomography
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F4
Re-evaluation of the patient's spine was performed 3 weeks later, which type 1 AOD was diagnosed [Figure 4].
PMC10198206_05
We can see Case 5 with type 3 AOD on sagittal view T2 sequence MRI (a) with acceptable reduction on the postoperation lateral radiograph (b). AOD: Atlanto-occipital dislocation, MRI: Magnetic resonance imaging
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F5
Therefore, the patient underwent surgery to fix the neck through the occiput plate and lateral mass screws from C2 to C4 [Figure 5].