Fig. 1
From: Os odontoideum in wolcott-rallison syndrome: a case series of 4 patients
Radiological images from Case 1. a) Pre-operative sagittal midline CT (on bone windows) shows an os odontoideum widely separated from the body of C2 with a widening of the anterior atlanto-dental distance. There is a marked reduction in the sagittal bony canal dimensions between C2 body and the C1 posterior arch) b) Post-operative sagittal midline CT (on bone windows) demonstrates resection of the posterior arch of atlas and some reduction of the os odontoideum with a reduced distance between the os and the body of C2. c) Lateral plain radiograph demonstrates the occipito-cervical rod and screw fixation