20-year-old female with history of Chiari malformation experiencing chronic headaches and vision changes Brain MRI:Limited diffusion weighted images are negative. Sagittal T1 weighted images demonstrate stable postoperative changes of suboccipital midline craniectomy and removal of posterior arch of C1 for decompression of the foramina magnum. There is expected expansion of thecal sac and no detectable deformity of the cerebellar tonsils. This finding is similar to prior examination. CSF flow demonstrates biphasic flow posteriorly at the level of the foramen magnum and cerebellar tonsils.The signal intensity and morphology of the brain is within normal limits. There is no evidence of hydrocephalus.Metallic artifact overlapping the left occipital bone producing significant amount of ferromagnetic artifact which obscures adjacent brain parenchyma and calvarium. Overall exam demonstrates no interval change since prior study.Cervical spine MRI: Examination redemonstrates expected postoperative changes of suboccipital midline craniectomy and removal of posterior arch of C1 and resultant expansion of thecal sac.The signal intensity and caliber of the cord remains within normal limits with no evidence of syrinx. There are no significant degenerative changes or stenoses.
1.Stable postoperative changes of suboccipital craniectomy, unremarkable, and stable since prior study.2.MRI examination of cervical spine demonstrates no evidence of syrinx or stenoses.