Chiari status post decompression several years ago with new neck pain. Do with CSF flow study. There are postoperative changes of suboccipital decompression including resection of the posterior C1 arch and widening of the foramen magnum. CSF spaces at the foramen magnum are increased since prior study. There is improvement in biphasic CSF flow at the foramen magnum, which is greater ventrally then dorsally. There is mild retroflexion of the dens contributing to partial CSF space effacement ventrally, where there is good biphasic flow. The cervical vertebral bodies are appropriate in height. Alignment is maintained. Bone marrow signal is within normal limits. The cervical spinal cord has normal signal characteristics and overall morphology. No evidence of syrinx.There is no significant disc disease, spinal canal, or neural foraminal stenosis at any level. Vertebral artery flow voids are maintained.
Postoperative changes related to Chiari I decompression. Biphasic CSF flow at the neo-foramen magnum is preserved. No evidence of syrinx.