Abstract：
The endoscopic endonasal approach (EEA) offers a minimally invasive route to treat medial intraconal space (MIS) lesions. Understanding the configuration of the ophthalmic artery (OphA) and the central retinal artery (CRA) is crucial.
An EEA to the MIS was performed on 30 orbits. The description of the intraorbital part of the OphA was divided into 3 segments and classified as type 1 and type 2 and the MIS was divided into three surgical zones (A, B, C). The CRA\'s origin, course, and point of penetration (PP) were analyzed. The relationship between the position of the CRA in the MIS and the OphA type was analyzed.
The OphA type 2 was present in 20% of specimens. The site of origin of the CRA from the OphA was found on the medial surface in type 1 and on the lateral surface of type 2. The point of penetrationof the central retinal arterywas found in 87% of the specimens on the inferomedial surface, just anterior to the inferior muscular trunk, at an average distance of 9.5 mm ± 1 from the globe and 17 mm ± 1.5 from the AZ. The presence of the CRA in Zone C was associated only with OphA type 1.
OphA type 2 is a common finding and can compromise the feasibility of an EEA to the MIS. A detailed preoperative analysis of the OphA and CRA should be conducted prior to approaching the MIS due to the implications of the anatomical variations that can compromise safe intraconal maneuverability during an EEA.
An EEA to the MIS was performed on 30 orbits. The description of the intraorbital part of the OphA was divided into 3 segments and classified as type 1 and type 2 and the MIS was divided into three surgical zones (A, B, C). The CRA\'s origin, course, and point of penetration (PP) were analyzed. The relationship between the position of the CRA in the MIS and the OphA type was analyzed.
The OphA type 2 was present in 20% of specimens. The site of origin of the CRA from the OphA was found on the medial surface in type 1 and on the lateral surface of type 2. The point of penetrationof the central retinal arterywas found in 87% of the specimens on the inferomedial surface, just anterior to the inferior muscular trunk, at an average distance of 9.5 mm ± 1 from the globe and 17 mm ± 1.5 from the AZ. The presence of the CRA in Zone C was associated only with OphA type 1.
OphA type 2 is a common finding and can compromise the feasibility of an EEA to the MIS. A detailed preoperative analysis of the OphA and CRA should be conducted prior to approaching the MIS due to the implications of the anatomical variations that can compromise safe intraconal maneuverability during an EEA.
摘要：
背景：内镜经鼻入路（EEA）提供了一种微创途径来治疗内侧腔内间隙（MIS）病变。了解眼动脉（OphA）和视网膜中央动脉（CRA）的构型至关重要。
方法：在30个轨道上对MIS进行EEA。OphA的眶内部分的描述分为三段，分为1型和2型，MIS分为三个手术区（A，B,C).CRA的起源，当然,并对渗透点(PP)进行了分析。剖析了CRA在MIS中的位置与OphA类型的关系。
结果：OphA2型存在于20%的标本中。来自OphA的CRA的起源部位位于1型的内侧表面和2型的外侧表面。在下表面87％的标本中发现了CRA的PP，就在下肌躯干的前面，与地球仪的平均距离为9.5mm±1，与AZ的平均距离为17mm±1.5。C区CRA的存在仅与OphA1型相关。
结论：OphA2型是一个常见的发现，可能会损害EEA对MIS的可行性。在接近MIS之前，应对OphA和CRA进行详细的术前分析，因为解剖变化可能会损害EEA期间的安全腔内机动性。
方法：在30个轨道上对MIS进行EEA。OphA的眶内部分的描述分为三段，分为1型和2型，MIS分为三个手术区（A，B,C).CRA的起源，当然,并对渗透点(PP)进行了分析。剖析了CRA在MIS中的位置与OphA类型的关系。
结果：OphA2型存在于20%的标本中。来自OphA的CRA的起源部位位于1型的内侧表面和2型的外侧表面。在下表面87％的标本中发现了CRA的PP，就在下肌躯干的前面，与地球仪的平均距离为9.5mm±1，与AZ的平均距离为17mm±1.5。C区CRA的存在仅与OphA1型相关。
结论：OphA2型是一个常见的发现，可能会损害EEA对MIS的可行性。在接近MIS之前，应对OphA和CRA进行详细的术前分析，因为解剖变化可能会损害EEA期间的安全腔内机动性。
