PMC9091385_01
Pre-operative plain radiographs. (a) Anterior-posterior radiograph, (b) lateral radiograph, (c) lateral radiograph in flexion, and (d) lateral radiograph in extension.
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F1
Anterior-posterior and lateral radiographs of the cervical spine showed an abnormal structure at the C2-3 level and did not show spina bifida at the cervical spine (Fig. 1-a, b). Lateral flexion-extension radiographs did not show instability of the cervical spine (Fig. 1-c, d).
Pre-operative T2-weighted magnetic resonance imaging. (a) Mid-sagittal, (b) coronal, and   axial.
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F2
C2-3 level (Fig. 2-A, b, c). Computed tomography (CT) showed an invaginated abnormal bony structure at the C2-3 level and an abnormal lateral mass on the right side at the C2-3 level (Fig. 3-a, b, c, d, e).
Pre-operative computed tomography. (a) Mid-sagittal, (b) axial at C2 lamina, (c) axial at C2-3 level, (d) three-dimensional image, and (e) three-dimensional image with an anomalous bony structure.
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F3
C2-3 level (Fig. 2-A, b, c). Computed tomography (CT) showed an invaginated abnormal bony structure at the C2-3 level and an abnormal lateral mass on the right side at the C2-3 level (Fig. 3-a, b, c, d, e).