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  Indian J Med Microbiol
 

Figure 1: Hypoplastic C1 posterior arch with normal atlanto dental interval on flexion (a) and extension (b) sagittal computed tomography images. Axial section through the C1 shows hypertrophy affecting right sided lateral mass with deficient left half of the posterior arch (c). Magnetic resonance (MR) imaging of the craniovertebral junction shows ventral compression on the neuraxis with hyperintensity within the cord against the C2 body suggestive of early syrinx formation (d). Axial MR section through the same level shows anterolateral indentation on the spinal cord by the bony hypertrophy (e)

Figure 1: Hypoplastic C1 posterior arch with normal atlanto dental interval on flexion (a) and extension (b) sagittal computed tomography images. Axial section through the C1 shows hypertrophy affecting right sided lateral mass with deficient left half of the posterior arch (c). Magnetic resonance (MR) imaging of the craniovertebral junction shows ventral compression on the neuraxis with hyperintensity within the cord against the C2 body suggestive of early syrinx formation (d). Axial MR section through the same level shows anterolateral indentation on the spinal cord by the bony hypertrophy (e)