CT
CT angiogram of the neck and brain showed extensively dilated vertebral and paraveterbal venous plexus it the left half of the spinal canal and left side of neck, with both intraspinal and extraspinal extensions.
Arterial feeders are from left vertebral artery (coronal, axial), left external carotid artery branches and 1st and 2nd part of left subclavian artery.
Vascular channels are compressing the spinal cord and causing bone remodelling.