Close
Unilateral well-corticated bony defect at the left side of the posterior arch of C1, likely congenital. The anterior arch is preserved.
Otherwise, the cervical alignment, vertebral body heights and disc spaces are normal. No acute bony fracture. No facet joint subluxation or dislocation.
IMPRESSION: Incidental finding of congenital C1 posterior arch anomaly - Currarino type B