Fig. 2From: Reconsideration of the transoral odontoidectomy in complex craniovertebral junction patients with irreducible anterior compressionThe incision on the posterior pharyngeal wall, anatomical landmarks, and the resection range of the odontoid process were determined according to the navigation. a Facial surface registration. b, c, d Axial, sagittal, coronal CT navigation image indicating the midpoint of anterior C1 arch lower marginBack to article page