Occipitoatlantal hypermobility.
D000293:Adolescent; D000328:Adult; D001696:Biomechanical Phenomena; D001270:Cervical Atlas / Q000000981:diagnostic imaging / Q000502:physiology / Q000503:physiopathology*; D005260:Female; D006801:Humans; D009777:Occipital Bone / Q000000981:diagnostic imaging / Q000502:physiology / Q000503:physiopathology*; D011859:Radiography; D013122:Spinal Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology