RESUMEN
Objective To comparatively study the displacement of surrounding structures of jugular foramen (JF) via far lateral approach under middle cranial flexion supine and oblique supine,and to provide the anatomical basis for the protection of these relative structures during choosing regional surgical approaches.Methods Forty-one healthy adults were scanned by PHILIPS Brilliance 64-slice CT according to the conditions:1 mm thick bone window under the middle cranial flexion supine position and oblique supine positions,continuous axial scanning,and being ranged from horizontal canal to C3 levels bony landmarks.The scanned images were inputted Philips Extended Brilliance Workspace CT reconstruction of multi-plane (MPR) and the data were measured.Results In the middle cranial flexion supine position,the distances from transverse process atlas to the ipsilateral mastoid tip,tip of the styloid process,the midpoint of the outer edge in occipital condyle were (20.99±4.18) mm,(20.49±5.47) mm,and (22.035±4.27) mm.In the supine oblique position,the distances from transverse process atlasto the ipsilateral mastoid tip,tip of the styloid process,the midpoint of the outer edge in occipital condyle were (22.795±3.29) mm,(22.315±5.48) mm and (23.025±3.91) mm.Significant differences were noted in these three distances between the two positions (P＜0.05).Conclusion In the JF surgical approach,supine oblique can change the relative spatial relationship of correlative structures,increase the exposure of the jugular vein area,therefore,protect the facial nerve,vertebral artery and posterior extracranial structures,and reduce the damage to surrounding structural tissues and the complications.