Chiari I malformation with syrinx
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Cerebellar tonsils are herniated through the foramen magnum, compressing the proximal cord resulting in syrinx that extends beyond the lower aspect of the field of view. No hydrocephalus.
Chiari I malformations are the most common variant of the Chiari malformations, and it is characterized by a caudal descent of the cerebellar tonsil. A cervical cord syrinx is present in ~35%.