Figure 5
From: Craniocervical junction malformation in a child with Oromandibular-limb hypogenesis-Möbius syndrome
3D sagittal CT scan; Agenesis of the posterior arch of the atlas (arrow-a). Arrow (b) notes the Wachenheim clivus line, which is drawn along the posterior aspect of the clivus toward the odontoid process; in our patient the line does not intersect or is it tangential to the odontoid process. The latter confirms the existence of progressive craniocervical abnormality.