Figure 4From: Cervical myelopathy caused by atlantoaxial instability in a patient with an os odontoideum and total aplasia of the posterior arch of the atlas: a case report Stereoscopical model of the cervical spine based on three-dimensional computed tomography data. (A) The view from the posterior direction. (B) The view from the lateral direction. Complete absence of the C1 posterior arch and hypertrophy of the spinous process of the axis were observed.Back to article page