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Limin Xiao, Shenhao Xie, Bin Tang, Jialing Hu and Tao Hong

ACP Like the transcranial clinoidectomy, anatomical variations of the ACP make the purely endonasal endoscopic anterior clinoidectomy much more difficult. The ACP is not always the same shape and size from person to person. Mikami et al. 16 reported that pneumatization of the ACP was present in 9.2% of all 600 sides (300 patients). Another important variation of the ACP is the bony bridge connecting the anterior and posterior clinoid processes, which accounts for 5% of ACPs. 4 It has also been reported that the carotid-clinoid foramen 19 (interosseous bridge