,MRI:, Arnold Chiari II with syrinx: Severe basilar invagination, marked compression of ventral pontomedullary junction, downward descension of cerebellar tonsils and vermis.
,MRI : , Arnold Chiari II with syrinx : Severe basilar invagination , marked compression of ventral pontomedullary junction , downward descension of cerebellar tonsils and vermis .