PMC3190429_01
CT scan axial section showing the posterior arch defect
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F1
High-resolution thin-section computed tomography of the CV junction revealed a fusion defect of atlas posterior arch in the center with a faint bony bar in the canal [Figures 1 and 2].
Reconstructed CT scan showing the compressing element
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F2
High-resolution thin-section computed tomography of the CV junction revealed a fusion defect of atlas posterior arch in the center with a faint bony bar in the canal [Figures 1 and 2].
MRI sagittal section showing severe constriction
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F3
Magnetic resonance imaging showed a posteriorly compressing atlas stenosis with a syringomyelia extending from medulla to C5 vertebra level [Figure 3].