Extended transcavernous posterior clinoidectomy in endoscopic endonasal surgery

医学 韧带 解剖 外科
作者
Yuanzhi Xu,Christine K. Lee,Jonathan Rychen,Muhammad Reza Arifianto,Maximiliano Núñez,Aaron Cohen‐Gadol,Juan C. Fernández-Miranda
出处
期刊:Journal of Neurosurgery [Journal of Neurosurgery Publishing Group]
卷期号:: 1-11
标识
DOI:10.3171/2024.6.jns24606
摘要

OBJECTIVE Mastery of the posterior clinoidectomy technique is of utmost importance for neurosurgeons who specialize in endoscopic endonasal approaches, because the posterior clinoid process (PCP) is commonly involved in chondroid tumor resection. Three main techniques for posterior clinoidectomy have been developed: intradural, extradural, and transcavernous interdural. The authors introduce here a novel technical variant in which the transcavernous approach is extended to the dorsal clinoidal space after transection of the caroticoclinoid ligament, and they elaborate on its clinical application on the basis of anatomical dissections and radiological studies. METHODS The authors reviewed CT angiography images and 3D reconstruction of the PCP in 50 adults to analyze the height and presence of ossified ligament attachments. In addition, endoscopic endonasal posterior clinoidectomy was performed in 20 lightly embalmed postmortem human heads. Three techniques, including extradural, transcavernous, and extended transcavernous posterior clinoidectomy, were performed sequentially, and anatomical landmarks and areas exposed with each technique were investigated and compared. RESULTS Using radiological studies, the authors categorized the PCPs as 1 of 2 types: 1) normal, defined as less than or equal to 8 mm high with no ossified ligament attachments; or 2) complex, defined as greater than 8 mm high with or without an ossified ligament attachment. Compared with extradural (exposed PCP height 4.7 ± 0.5 mm) and transcavernous (exposed PCP height 7.3 ± 0.8 mm) posterior clinoidectomies, the extended transcavernous posterior clinoidectomy provided the maximally exposed PCP height (9.6 ± 0.4 mm; p < 0.0001). CONCLUSIONS This report details the extended transcavernous posterior clinoidectomy as a novel technical variant for achieving maximal exposure of the PCP in endoscopic endonasal surgery. In addition, the positive results establish the importance of preoperative skull base imaging for surgical planning.
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