A Ozgen1, U Aydingöz. 1. Department of Radiology, School of Medicine, Hacettepe University, Ankara, Turkey.
Abstract
PURPOSE: The purpose of this work was to establish criteria for the diameters of normal extraocular muscles and superior ophthalmic vein and width of the optic nerve-sheath complex, to determine normal globe position as seen on MRI, and to investigate the effects of age and sex on these structures. METHOD: Diameters of the extraocular muscles and superior ophthalmic vein, width of the optic nerve-sheath complex, and distance from the interzygomatic line to the posterior margin of the globe were calculated for 200 normal orbits of 100 patients on T1-weighted MR scans. RESULTS: Normal ranges for diameters of the extraocular muscles were as follows (mean +/- 2 SD): medial rectus, 3.2-4.9 mm; lateral rectus, 2.6-4.8 mm; inferior rectus, 3.7-6.0 mm; superior group, 3.1-5.6 mm; superior oblique, 2.4-4.1 mm. The normal position of the posterior pole of the globe was 8.9 mm behind the interzygomatic line (range 5.0-12.7 mm). The mean diameters of the extraocular muscles in male patients were significantly larger than those in female patients (p < 0.001). CONCLUSION: These data may be of value in quantitatively evaluating MRI of the orbit.
PURPOSE: The purpose of this work was to establish criteria for the diameters of normal extraocular muscles and superior ophthalmic vein and width of the optic nerve-sheath complex, to determine normal globe position as seen on MRI, and to investigate the effects of age and sex on these structures. METHOD: Diameters of the extraocular muscles and superior ophthalmic vein, width of the optic nerve-sheath complex, and distance from the interzygomatic line to the posterior margin of the globe were calculated for 200 normal orbits of 100 patients on T1-weighted MR scans. RESULTS: Normal ranges for diameters of the extraocular muscles were as follows (mean +/- 2 SD): medial rectus, 3.2-4.9 mm; lateral rectus, 2.6-4.8 mm; inferior rectus, 3.7-6.0 mm; superior group, 3.1-5.6 mm; superior oblique, 2.4-4.1 mm. The normal position of the posterior pole of the globe was 8.9 mm behind the interzygomatic line (range 5.0-12.7 mm). The mean diameters of the extraocular muscles in male patients were significantly larger than those in female patients (p < 0.001). CONCLUSION: These data may be of value in quantitatively evaluating MRI of the orbit.
Authors: C E Al-Haddad; M G Sebaaly; R N Tutunji; C J Mehanna; S R Saaybi; A M Khamis; R G Hourani Journal: AJNR Am J Neuroradiol Date: 2017-12-07 Impact factor: 3.825
Authors: C A Tiegs-Heiden; L J Eckel; C H Hunt; F E Diehn; K M Schwartz; D F Kallmes; D R Salomão; T E Witzig; J A Garrity Journal: AJNR Am J Neuroradiol Date: 2014-03-13 Impact factor: 3.825