====== Axis vertebra lesion ======

see [[Axis tumor]]


2. infection: [[osteomyelitis]] of the axis. see [[Vertebral osteomyelitis]]

3. [[pannus]] from old nonunion of fracture or from [[rheumatoid arthritis]] (RA)

4. erosive changes in the [[odontoid process]] with [[rheumatoid arthritis]] (RA)