Figure 1From: Atlantoaxial subluxation as an early manifestation in an adolescent with undifferentiated spondyloarthritis: a case report and review of the literature A) Lateral cervical spine X-ray showing an atlantodental interval (arrow) of less than 6 mm. B) Lateral cervical spine X-ray shows a progressive widening of the atlantodental interval (arrow) to more than 10 mm in the span of three months.Back to article page