【justin1999031】評論
Chiari malformations, types I-IV, refer to a spectrum of congenital hindbrain abnormalities affecting the structural relationships between the cerebellum, brainstem, the upper cervical cord, and the bony cranial base.Classification is based on the morphology of the malformations [4] :Chiari I: >5mm descent of the caudal tip of cerebellar tonsils past the foramen magnum.