Chung S K, Dhong H J, Kim H Y
Department of Otorhinolaryngology-Head and Neck Surgery, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Republic of Korea.
Am J Rhinol. 2001 Mar-Apr;15(2):77-81. doi: 10.2500/105065801781543691.
The roof of the anterior ethmoid swings up anteriorly from its more or less horizontal course at the point where the anterior ethmoid canal (AEC) is situated. The AEC is an important structure in endoscopic sinus surgery since its injury results in bleeding into the nasal cavity and may result in intraorbital bleeding. We therefore investigated the location of this canal and the anatomic characteristics of the area surrounding the canal using coronal computed tomography (CT) of the paranasal sinuses. One hundred sides of 50 paranasal coronal CT images in patients with sinusitis were analyzed to assess the location of the AEC, the shape of the superolateral wall of the ethmoid sinus anterior and posterior to the AEC, and pneumatization of the roof of the anterior ethmoid sinus. The AEC is situated in the second quarter of the roof of the ethmoid sinus. The superolateral wall anterior to the AEC demonstrated an acute angle in 99% of sides, while the superolateral wall posterior to the AEC showed an obtuse angle in 87% of sides. The ethmoid cell anterior to the AEC pneumatized posteriorly over the AEC in 26% of sides. We conclude that coronal CT confirmation of the anatomic characteristics of the AEC, and the area surrounding the canal, is invaluable for preoperative planning for endoscopic sinus surgery.
筛骨前壁在筛骨前管（AEC）所在处从其大致水平的走行向前上方摆动。AEC在内镜鼻窦手术中是一个重要结构，因为其损伤会导致鼻腔出血，并可能导致眶内出血。因此，我们使用鼻窦冠状位计算机断层扫描（CT）研究了该管道的位置以及管道周围区域的解剖特征。分析了50例鼻窦炎患者的100侧鼻窦冠状位CT图像，以评估AEC的位置、AEC前后筛窦上外侧壁的形状以及筛骨前窦顶的气化情况。AEC位于筛窦顶的第二象限。AEC前方的上外侧壁在99%的侧别中呈锐角，而AEC后方的上外侧壁在87%的侧别中呈钝角。AEC前方的筛房在26%的侧别中向后气化至AEC上方。我们得出结论，冠状位CT对AEC及其周围区域解剖特征的确认，对于内镜鼻窦手术的术前规划非常重要。
