PMC6431363_01
Lateral cervical X-ray at the first visit to our hospital showing instruments on C1/C2, O-C2 angle of 17-degree kyphosis, and vertical subluxation: Redlund-Johnell's distance, 22 mm. Space available for the cord (SAC), atlantodental interval (ADI), and C2-7 angle are 15 mm, 2 mm, and 33 , respectively.
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fig1
Lateral cervical X-ray showed O-C2 angle of 17-degree kyphosis (Figure 1).
Computed tomography (CT) of the cervical spine showing erosion of anterior arch of C1 vertebra and dens (black arrow).
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fig2
Computed tomography (CT) showed an erosive lesion at dens and anterior arch of the atlas (Figure 2).
Sagittal T2-weighted image of magnetic resonance imaging of the cervical spine at the first visit showing a mass on retropharyngeal space with heterogeneous intensity (white arrow).
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fig3
Magnetic resonance imaging showed a space-occupying lesion in the retropharyngeal space, which presented with heterogeneous signals on both T1- and T2-weighted images (Figure 3).
Lateral cervical X-ray after the posterior O-C3 fusion surgery at our hospital showing O-C2 angle of 6-degree lordosis.
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fig4
The O-C kyphosis was corrected to 6-degree lordosis on O-C2 (Figure 4).