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Magnetic resonance imaging (MRI) of the brain, axial T2 fluid-attenuated inversion recovery (FLAIR), and mid-sagittal T1-weighted images show tonsillar herniation (orange arrow) (A and B). The mid-sagittal T1-weighted image also shows platybasia with an abnormal skull base angle of 147 ° degrees (B). The coronal T2-weighted image shows a small syrinx at the C2-C3 intervertebral disc level (blue arrow) (C).
