Fig. 3From: Ossification of the cervical anterior longitudinal ligament is an underdiagnosed cause of difficult airway: a case report and review of the literaturePreoperative and postoperative cervical spine radiography: endotracheal tube got across the “beak-like” osteophyte in front edges of the C4, C5 vertebrae before operation (left, a) and the beak-like osteophyte has disappeared after operation (right, b)Back to article page