title: Anatomical study of posterior clinoid process (PCP) and its clinical meanings.
abstract: OBJECTIVE
  The aim of this study is to provide a new and comprehensive anatomic study of the posterior clinoid process (PCP) as well as data for PCP location to guide the surgeons in endoscopic surgery.
  
  
  METHODS
  Computed tomography angiography images of 120 PCPs and structures around them in adults were reviewed. The measurement was on coronal, sagittal, and axial planes after multiplanar reconstruction. The length, width, and thickness were accessed for the best understanding of the feature of PCP. The distance from the base of the PCP and the middle lowest point of the sellar floor was measured to find the position of the PCP during the transphenoid approach.
  
  
  RESULTS
  PCP varies in width and thickness in different portions of it and is closely related to the internal carotid artery and posterior communicating artery, which makes it an important landmark during surgery.
  
  
  CONCLUSIONS
  The shape of PCP is various, and the analysis of its relationship to the important structures around it is of great value. In addition, the preoperative radiological evaluation plays a major role in patients considered for endoscopic sinus surgery. Detailed preoperative analysis of the anatomy of the sphenoid sinus and its boundaries is crucial in facilitating entry to the pituitary fossa and reducing intraoperative complications.
authors.affiliation: From the *Department of Neurosurgery, First Hospital of Jilin University, Chaoyang District; †Department of Neurology, China-Japan Union Hospital of Jilin University, Changchun; and ‡Department of Radiology, First Hospital of Jilin University, Chaoyang District, Jilin Province, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Cheng
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.forename: Zijian
authors.initials: Z
authors.lastname: Zhou
authors.forename: Jiajing
authors.initials: J
authors.lastname: Zhu
authors.forename: Yan
authors.initials: Y
authors.lastname: Feng
authors.forename: Gang
authors.initials: G
authors.lastname: Zhao
mesh_terms: D000328:Adult; D000368:Aged; D000792:Angiography; D004724:Endoscopy / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012658:Sella Turcica / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D019291:Skull Base / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D013100:Sphenoid Bone / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D013101:Sphenoid Sinus / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D036542:Tomography, Spiral Computed / Q000379:methods*; D055815:Young Adult