Evaluation of Parameters Relevant to Paraclinoid Microsurgery: Morphometric Analysis of the Anterior, Middle, and Posterior Clinoid Processes

Background/Objectives: The paraclinoid region—bounded by the anterior clinoid process (ACP), middle clinoid process (MCP), posterior clinoid process (PCP), optic strut (OS), and sella turcica—is critical in skull base anatomy owing to its proximity to the optic nerve, internal carotid artery (ICA), and cavernous sinus. Because the bony anatomy of this region varies considerably between individuals, detailed morphometric characterization is a prerequisite for anticipating the working corridor before anterior clinoidectomy and related approaches. This study aimed (1) to quantify the morphometric parameters of the optic canal (CO) and the ACP, MCP, and PCP using computed tomography angiography (CTA), (2) to test right–left and sex-based differences and topographic correlations among these parameters and cranial dimensions, and (3) to derive exploratory morphometric classifications of ACP shape and the ACP–OS relationship.