Multislice computed tomography evaluation of lateral orbital wall and sphenoid trigone in Türkiye

Abstract

AimIn this study, we aim to investigate the anterior-posterior length of the lateral orbital wall, and the width and thickness of the posterior base of the sphenoid trigone using multislice computed tomography (MSCT).MethodsOrbital CT images of 110 patients who were referred to the radiology clinic for non-emergency reasons between January 1, 2017, and December 30, 2017, were evaluated retrospectively. Patients with past orbital surgery, orbital disease, asymmetric imaging, acute dacryocystitis, or age under 18 years were excluded. The lateral orbital distance was measured from the axial lateral orbital rim to the point where the lateral rectus muscle contacted the bone. The lateral wall width was measured at the superior border of the lateral rectus muscle, and the sphenoid trigone thickness was measured at the same level through axial and coronal sections.ResultsIn the right eye, orbital lateral wall length was 21.6 mm, trigone thickness was 13.0 mm, and lateral wall width was 13.0 mm; in the left eye, orbital lateral wall length was 20.7 mm, trigone thickness was 9.5 mm, and lateral wall width was 13.4 mm. Significant differences were observed between right and left eyes in lateral wall length and thickness (P < .001). Trigone thickness showed no significant difference (P = .448). Gender-based differences were noted in lateral wall and trigone measurements (P < .05). ConclusionThese measurements provide standard reference values for the lateral orbital wall and sphenoid trigone. They may assist surgeons in planning deep lateral orbital decompression surgery and prevent complications such as unintended entry into the cranial fossa or dural injury.

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