School ager with juvenile idiopathic arthritis with neck pain and torticollis for 6 weeks

CT of atlanto-axial rotatory subluxation due to juvenile idiopathic arthritis
Axial images from a CT without contrast of the cervical spine shows the C1 vertebral body rotated to the left approximately 45 degrees (top) in relation to the C2 vertebral body (middle). A MIP image (bottom) better demonstrates the rotation of C1 on C2.

The diagnosis was atlanto-axial rotatory subluxation due to juvenile idiopathic arthritis.