Four-year-old girl with Chiari I malformation and previous incomplete decompressive surgery

(A) T1-weighted sagittal MRI of the cervical and thoracic spine before repeat surgery shows herniation of the cerebellar tonsils to C2-3, hypointensity and frank cavitation from C6-T1 (syrinx), and indistinct parenchymal hypointensity from C2-5 and T2-3 (presyrinx).
(B) T2-weighted sagittal MRI of the cervical and thoracic spine before repeat surgery shows T2 prolongation in the areas of the syrinx and presyrinx.
(C) T2-weighted sagittal MRI of the cervical and thoracic spine after decompression shows decreased size of the large cervical cord syrinx (C6-7) and complete resolution of the presyrinx.