Chiari I malformation
Bilateral lower limb weakness for 4 years
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Marked caudal descent of cerebellar tonsils through the foramen magnum.
Syrinx formation along the spine more prominent in the thoracic level (from T3 to T8)
Chiari I malformation characterized by a caudal descent of the cerebellar tonsil through the foramen magnum. It is more frequently seen in female (as in our case).
Treatment for patient with syrinx consists of decompressing the posterior fossa.