Chiari malformation with cerebellar tonsils extending 13 mm below the foramen magnum. There is an associated large syrinx within the cervical cord. This would be better evaluated on MRI.
No evidence of acute ischaemia. No intra or extra-axial haemorrhage is seen.
The extracranial vessels, circle of willis and vertebrobasilar system opacity normally. No evidence of significant arterial stenosis, aneurysm or vascular malformation. No evidence of dissection.
Cervical spine alignment normal. No suspicious bone lesions. Lung apices clear.Conclusion
Chiari malformation with large syrinx. Further evaluation with MRI is recommended if this has not been previously diagnosed.