Grisel Syndrome

Grisel syndrome is rotary atlantoaxial subluxation associated with pharyngeal infection or surgical trauma that occurs predominantly in children. Pharyngeal infection or surgery results is hyperemia that causes decalcification of the anterior arch of C1 and laxity of the transverse ligament.

References

Harth M, Mayer M, Marzi I, Vogl TJ. Lateral torticollis on plain radiographs and MRI: Grisel syndrome. Eur Radiol. 2004 Sep;14(9):1713-5.