摘要
目的 探讨健康人视神经管的CT解剖结构及临床意义。方法 对 2 0 0例 (40 0侧 )健康成人行视神经管区轴位和冠状位薄层CT扫描 ,测量视神经管的有关径线 ,并观察其与周围结构的解剖关系。结果 ①双侧视神经管径线均值 :左右径 (3 5 7± 0 6 1)mm( x±s,下同 ) ,上下径 (4 82±0 38)mm ;内侧壁长度 (12 6 2± 2 5 9)mm ,外侧壁长度 (10 18± 2 19)mm ,视神经管长度 (11 46± 2 35 )mm ;与颅正中线夹角 34 34°± 6 48° ,与眶内段视神经夹角 10 6 9°± 6 48° ;内侧壁厚度 (0 6 8± 0 46 )mm。双侧间差异均无显著性 (P >0 0 5 ) ;②视神经管、眶上裂、眶下裂在CT轴位像上分别表现为“轨道状”、“裂隙状”和“狭谷状” ,在冠状位像上分别表现为“蝶眼状”、水平状裂隙和垂直状裂隙 ;③后组筛窦与视神经管的位置关系为 :管前型占 42 0 0 %、半管型占 2 7 5 0 %、全管型占 18 75 %、蝶鞍型占9 75 %和管周型占 2 0 0 % ;④蝶窦气化度与视神经管的位置关系为 :Ι度蝶窦占 2 0 %、Π度蝶窦占6 3%和Ш度蝶窦占 17% ;⑤视神经管内侧壁骨质缺损发生率为 2 5 5 % ,缺损平均长度为 (5 0 7±2 5 2 )mm。结论 CT是显示视神经管正常解剖结构及其与周围器官毗邻关系的可靠手段 。
Objective To probe into the normal anatomy of the optic canal and its clinical significance Methods The optic canals of 200 normal subjects were examined by thin layer CT scan in axial nd coronal positions. The distance and anatomic relationship with circumferentral structure were measured. Results In average: (1)The transverse diameter of the optic canal was (3 57±0 61) mm, the longitudinal diameter was (4 82±0 38) mm, the length of the inner wall was (12 62±2 59) mm, the length of the outer wall was (10 18 ±2 19) mm, and the length of the optic canal was (11 46±2 35) mm The angle between optic canal and the middle line of the skull was 34 34°±6 48°,the angle between optic canal and the intraorbital optic was 10 69°±6 48° The thickness of the inner wall was (0 68±0 46) mm It showed no significant difference between the two sides of the optic canal in diameters( P >0 05) (2)The optic canal, the superior orbital fissure and the inferior orbital fissure were respectively shown as track, crack and gorge type in CT axial pictures, while in the coronal pictures, they were respectively shown as butterfly eyes, horizontal fissure and vertical fissure type (3)The relationship of the posterior ethmoid sinus and the optic canal was: anterocanal(42 00%), semicanal(27 5%), whole-canal(18 75%),sella turcica(9 75%) and circumcanal(2 00%) (4)The relationship of the position of the sphenoidal sinus and the optic canal was: Ι degree sphenoidal sinus(20%),Π degree (63%) and Ш degree (17%) (5)The incidence of the bony defect of the inner optic canal wall was 25 5% The range of the defect was (5 07±2 52) mm Conclusion It′s a reliable way to show the relation of the optic canal and circumcanal by CT,and it is of important value in operation
出处
《中华耳鼻咽喉科杂志》
CSCD
2000年第4期275-277,I020,共4页
Chinese Journal of Otorhinolaryngology
关键词
视神经管
蝶窦
CT
测量
健康人
Optic nerve
Sphenoid sinus
Tomography,X-ray computed
