Cervical trauma - unilateral perched facet joint

Fracture of the right transverse process involving the adjacent foramen transversarium, and extending through the superior articular process but does not cross the facet joint.

A bone fragment is seen in the right C6 neural exit foramen. The fractured superior articular process of C6 is anteriorly dislocated resulting in mild anterolisthesis of C5 over C6. The intervertebral disc space at C5/6 has widened anteriorly, suggesting disruption of the ALL (the bridging syndesmophyte appears fractured and the adjacent soft tissues are prominent).

The remainder vertebral bodies are normally aligned, and have normal heights. Diffuse degenerative changes of the cervical spine, especially involving C5/6, C67 and C7/T1, characterized by posterior disc-osteophyte complexes and loss of the respective discs heights.

• fracture of the right transverse process of C6 involving the adjacent foramen transversarium
• anterior dislocation of the right facet of C5 over C6 - unilateral perched facet joint

Contrast opacification of a short segment of the proximal right vertebral artery. No contrast opacification throughout the remaining extra dural right vertebral artery secondary to arterial dissection at the fracture site. No large adjacent soft tissue hematoma. Retrograde filling of the distal V4 segment of the right vertebral artery. Normal contrast opacification of the common carotids, internal carotids, left vertebral and basilar artery. Tortuosity of the right and left internal carotids. Normal circle of Willis anatomy. Normal contrast opacification of the anterior cerebral, middle cerebral and posterior cerebral arteries. ​