Anatomical Insights of the Internal Carotid Artery Dural Rings: Endonasal and Transorbital Comparative Perspective

The clinoidal segment of the internal carotid artery (ICA) is a complex transition zone between the intracavernous and intradural spaces. It is bordered by the distal dural ring (DDR), proximal dural ring (PDR), and anterior clinoid process (ACP). This study provides an endoscopic anatomical analysi...

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Published inJournal of neurological surgery. Part B, Skull base
Main Authors Manfrellotti, Roberto, Mosteiro, Alejandra, Gagliano, Dario, López, Lorena Gómez, Lasunin, Nikolay, Valdivia, Doriam Perera, Giussani, Carlo Giorgio, Carrabba, Giorgio Giovanni, Torné, Ramon, Prats-Galino, Alberto, Somma, Alberto Di, Enseñat, Joaquim
Format Journal Article
LanguageEnglish
Published 21.04.2025
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ISSN2193-6331
2193-634X
DOI10.1055/a-2565-8881

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Summary:The clinoidal segment of the internal carotid artery (ICA) is a complex transition zone between the intracavernous and intradural spaces. It is bordered by the distal dural ring (DDR), proximal dural ring (PDR), and anterior clinoid process (ACP). This study provides an endoscopic anatomical analysis of the clinoidal region using the endonasal endoscopic approach (EEA) and endoscopic transorbital approach (ETOA). Ten cadaveric head specimens were dissected at the Laboratory of Surgical Neuroanatomy of the University of Barcelona. EEA exposes the medial clinoidal region, revealing the connection between the PDR and parasellar ligaments, although their individual components remain indistinct. ACP removal clarifies the relationship between DDR, the falciform ligament, and the diaphragma sellae. ETOA provides access to the outer clinoidal region, isolating PDR and DDR and detailing their continuity with adjacent ligaments. EEA and ETOA offer comprehensive insights into the clinoidal region's anatomy.
ISSN:2193-6331
2193-634X
DOI:10.1055/a-2565-8881