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目的:观察后组筛窦与蝶窦和视神经管的相互关系,为诊断鼻窦疾病及临床手术提供依据.材料与方法:对300例正常人筛、蝶窦进行CT扫描,其中34例行横断加冠状扫描,221例行横断扫描,45例行冠状扫描.结果:根据后组筛窦与蝶窦的位置关系,将后组筛窦分为蝶前型(54％)、蝶侧型(35％)和蝶上型(11％);根据后组筛窦与视神经管的位置关系,将后组筛窦分为管前型(45％)、半管型(23％)、全管型(15.3％)、蝶鞍型(15％)和管周型(1.7％).300例600侧中,发现管周型蝶窦20侧,占3.3％.结论:CT扫描是观察筛窦与蝶窦和视神经管解剖关系的首选方法,能为临床诊断鼻窦疾病和手术治疗提供依据,并提出了新的鼻窦分类方法.“,”Objective: To study the anatomical relationship between ethmoid sinus, sphenoid sinus and optic canal with CT, and to provide relevant data for diagnosis and surgery of paranasal sinus diseases.Materials and Methods:CT scanning of ethmoid and sphenoid sinuses was performed in 300 normal subjects, including axial (n=221), coronal (n=45), and axial together with coronal (n=34) scanning.Results:Based on the relation of posterior ethmoid sinus to sphenoid sinus, the posterior ethmoid sinus was divided into anterosphenoid (54%), laterosphenoid (35%) and superosphenoid (11%) types. According to the relation between posterior ethmoid and the optic canal, the posterior ethmoid sinus was divided into anterocanal (45%), semicanal (23%), canal (15.3%), sellar (15%) and circumcanal (1.7%) types. Of 600 sphenoid sinuses in 300 cases, 20 (3.3%) presented circumcanal type.Conclusion: For observing the anatomical ralation between ethmoid sinus, sphenoid sinus and optic canal, CT scan is of first choice, which offers useful anatomical data for diagnosis and surgery. A new classification for nasal sinuses is proposed.