Results
1690 of the patients for whom MSCT was performed were male and 835 were female. 67 of these patients had congenital anomalies at the CVJ. 13 of 67 patients had os odontoideum (OO), 38 had KFS, AOA was also frequently observed in KFS. Only AOA was observed in 16 cases. KFS and AOA often saw together. 10 patients with OO were male and 3 were female. The mean age of the patients with OO was 43.07 (range: 14-88). 22 patients with KFS were male and 16 were female. The mean age of these patients was 41.68 (range:0-71). 10 patients with AOA were male and 6 were female. The mean age of these patients was 39.12 (range:10-70) (Table 1).
Neck pain and limitation in the range of motion around the neck region were the most frequent finding in the patients who had congenital anomalies at the CVJ region. Various neurological findings were also present in these patients in accordance with the severity of coexisting dislocation and degenerative changes. Additionally, atlanto-occipital dislocation (AOD), Atlanta-dental dislocation (ADD), and atlanto-axial dislocation (AAD) were also detected. Loss of muscle strength and paralysis were observed clinically especially in the patients with MM who had prominent nerve compression.
9 of 13 patients with OO had dystopic (Figure 1a-b) and 4 were orthotopic type. 1 patient with OO had coexisting AC, 4 had AOD, 3 had ADD, 2 had roto-AAD, and 5 had MM. Fusion with the anterior arch of C1 vertebra in 1 patient with OO (Figure 1c-e) and fusion with clivus in another patient with OO was observed. 1 patient with OO had coexisting AOA (Table 1).