Objective: To find out the influence of development of the posterior ethmoid sinus on surgical approach via saddle area.
目的：为了了解后筛窦气化发育对前颅底外科及蝶鞍区手术的影响及术前指导意义。
Conclusion: the imaging anatomic classification of posterior ethmoid sinus has the instructive significance for basicranial surgery and the surgical approach via saddle area.
结论：后筛窦影像解部分型分度对前颅底外科及蝶鞍区手术具有实际的指导意义。
When disease involves the sphenoid, the sinus can be penetrated either intranasally or through the posterior ethmoid.
当病变累及蝶窦，可以经鼻内和后组筛窦进入蝶窦。
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