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Magnetic resonance imaging (MRI) showing Chiari malformation type I (CM-I).
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MRI of the cervical spine showed a 15-mm CM-I with cervical cord edema and mass effect on the brain stem ( Fig. 1 ).
Preoperative magnetic resonance imaging (MRI) of the thoracic spine demonstrating cervical and upper thoracic spinal cord edema.
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Spinal cord edema extended into the upper thoracic region to the level of T7 ( Fig. 2 ).
Right side motor evoked potentials (MEPs) pre- and post-decompression. The
red arrow
indicates time of bony decompression. Traces below the
arrow
show improved MEP response.
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The right abductor hallucis response became present and reliable with a small but complex multiphasic response ( Fig. 3 ).