title: Evidence for the improved exposure of the ophthalmic segment of the internal carotid artery after anterior clinoidectomy: morphometric analysis.
abstract: BACKGROUND
  Although resection of the anterior clinoid process (ACP) is valuable in the surgical treatment of aneurysms of the ophthalmic (C6) segment of the internal carotid artery (ICA), quantitative assessment of this adjunct is incomplete. Our morphometric study assesses the effectiveness of the anterior clinoidectomy for exposure of the C6 segment of the ICA.
  
  
  METHODS
  Ten formalin-fixed adult cadaveric heads were dissected bilaterally and pterional craniotomies were performed bilaterally. Measurements before and after resection of the ACP included the length of C6 segment of the ICA on its lateral aspect; C6 segment length on its medial aspect; and medial length of the optic nerve from the optic chiasm to falciform ligament (before ACP resection) then to the annulus of Zinn (after ACP resection).
  
  
  RESULTS
  Height and width of the intradural ACP were 8.67 +/- 2.63 and 6.57 +/- 1.68 mm, respectively. After clinoidectomy, mean length of the lateral C6 segment of the ICA increased 60% and mean exposure of the medial C6 segment of the ICA increased 113% (p < 0.001). Exposure of the optic nerve increased 150% (p < 0.001) after clinoidectomy and sectioning of the falciform ligament. No correlations were found between the lengths of the ACP and entire C6 segment, or the ACP size and amount of the C6 segment covered by the clinoid.
  
  
  CONCLUSIONS
  Exposure of the C6 segment of the ICA is markedly increased by increase of the mobility of the optic nerve with clinoidectomy and section of the falciform ligament.
authors.affiliation: Department of Neurosurgery, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267-0515, USA.
authors.forename: N
authors.initials: N
authors.lastname: Andaluz
authors.forename: F
authors.initials: F
authors.lastname: Beretta
authors.forename: C
authors.initials: C
authors.lastname: Bernucci
authors.forename: J T
authors.initials: JT
authors.lastname: Keller
authors.forename: M
authors.initials: M
authors.lastname: Zuccarello
mesh_terms: D002102:Cadaver; D002343:Carotid Artery, Internal / Q000033:anatomy & histology* / Q000601:surgery*; D002426:Cavernous Sinus / Q000473:pathology / Q000601:surgery*; D035262:Cranial Fossa, Anterior / Q000033:anatomy & histology / Q000601:surgery; D035301:Cranial Fossa, Middle / Q000033:anatomy & histology / Q000601:surgery*; D005260:Female; D006801:Humans; D008022:Ligaments / Q000033:anatomy & histology / Q000601:surgery; D008297:Male; D008488:Medical Illustration; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000379:methods*; D009880:Ophthalmic Artery / Q000033:anatomy & histology / Q000601:surgery; D009900:Optic Nerve / Q000033:anatomy & histology / Q000601:surgery; D013100:Sphenoid Bone / Q000033:anatomy & histology / Q000601:surgery*