Chiari I Malformation

  • Etiology: abnormality of dorsal induction
  • Imaging: peg shaped cerebellar tonsil > 5 mm below foramen magnum, syrinx in 25%

Radiology Cases of Chiari I Malformation

CT of Chiari I malformation
Sagittal midline 2D reconstruction of CT without contrast of the brain shows the cerebellar tonsils to be herniating > 5 mm beneath the foramen magnum.