Findings:
Simple rotatory atlantoaxial displacement without anterior shift (Fielding and Hawkins type I). Consequential impingement of the left-sided C2 nerve root.
The central canal is patent.
The cord and conus are unremarkable, as is the cauda equina. The cord terminates at L1. Fat intensity tissue is seen along the proximal filum terminale, in keeping with fatty filum terminale.
The vertebral bodies are of normal height with no evidence of fracture. The marrow signal is normal.
Moderate disc degeneration is seen in the cervical spine with decreased height and signal intensity of the intervertebral discs.
Multilevel disc bulging is seen at C3/4 – C5/6. Additional osteoarthritis of the uncovertebral joints with high-grade neural exit foraminal stenosis at right-sided C4/5 and C5/6.
No evidence of any disc herniation or relevant degeneration of the thoracic or lumbar spine.
No paravertebral abnormality is identified.
Conclusion:
Simple rotatory atlantoaxial displacement without anterior shift (Fielding and Hawkins type I) with impingement of the left-sided C2 nerve root.
Multilevel disc bulging and moderate degeneration of the cervical spine with high-grade neural exit foraminal stenosis at right-sided C4/5 and C5/6.
Otherwise, no relevant stenosis. No cord compression or neuropathy.