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。
Conclusion: the imaging anatomic classification of posterior ethmoid sinus has the instructive significance for basicranial surgery and the surgical approach via saddle area.
手术时通过磨除前床突、鞍结节，切开镰状襞等能松解视神经、颈内动脉，形成较宽敞的操作空间，良好的控制近端动脉。
The resection of the anterior clinoid process, the tuberculum and the falciform ligament can offer a roomy space to work and control the proximal artery;
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。
Objective: To find out the influence of development of the posterior ethmoid sinus on surgical approach via saddle area.
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