Fig. 3From: Os odontoideum in wolcott-rallison syndrome: a case series of 4 patientsRadiological images from Case 3. a Pre-operative CT scan showing C1-2 subluxation with antero-inferior subluxation of C1 lateral mass on C2; (b) pre-operative MRI images showing coronal and sagittal views of C2 demonstrating congenital dens hypoplasia with central dip typical of embryological abnormality and absence of posterior arch of C1; (c) post-operative XR image showing occipital C2 fixation following C1-2 reduction (C1 now in line with C2)Back to article page