Beden U, Edizer M, Elmali M, Icten N, Gungor I, Sullu Y, Erkan D
Ophthalmology Department, Ondokuz Mayis University, Samsun, Turkey.
Eur J Ophthalmol. 2007 May-Jun;17(3):281-6. doi: 10.1177/112067210701700301.
To determine the exact anatomic location and volume of the thickest section of the greater wing of the sphenoid bone (trigone), which is removed during deep lateral orbital wall decompression.
Eighteen dried skulls were used to determine the exact anatomic location and computed tomography (CT) images of 20 patients (10 male, 10 female) were used for volumetric calculations.
Mean values were 14.5 mm for the orbital rim to inferior orbital fissure distance, 23.3 mm for rim to trigone distance, 13.0 mm for width of the trigone base, 5.8 mm for trigone to orbital apex distance, and 12.3 mm for trigone height. The width of the narrowest section of the trigone was 5.2 mm. The trigone was found to have a lower segment (0.92 cc) neighboring the inferior orbital fissure, and an upper segment (0.32 cc) adjoining the thick substance of frontal bone. The narrowest part between these two segments was located just at the superior border of the lateral rectus muscle.
The authors recommend avoiding the thin rectangular portion located in the inter-fissural area adjacent to the superior orbital fissure. A high intersubject variability underscores the need for individualized preoperative analysis by imaging studies.
确定在眼眶外侧壁深层减压术中被切除的蝶骨大翼最厚部分（三角区）的确切解剖位置和体积。
使用18个干燥颅骨确定确切解剖位置，并利用20例患者（10例男性，10例女性）的计算机断层扫描（CT）图像进行体积计算。
眶缘至眶下裂距离的平均值为14.5毫米，眶缘至三角区距离为23.3毫米，三角区基底宽度为13.0毫米，三角区至眶尖距离为5.8毫米，三角区高度为12.3毫米。三角区最窄部分的宽度为5.2毫米。发现三角区有一个与眶下裂相邻的下段（0.92立方厘米）和一个与额骨厚质相邻的上段（0.32立方厘米）。这两个段之间最窄的部分恰位于外直肌的上缘。
作者建议避免切除位于眶上裂附近裂隙间区域的薄矩形部分。个体间的高度变异性突出了术前通过影像学研究进行个体化分析的必要性。
