RESUMO
BACKGROUND: The aims of this study were to analyze the relationships between the medial orbitofrontal artery (MOFA) and the anterior skull base (ASB) including anatomical endonasal landmarks using computed tomography angiography (CTA). METHODS: We studied 52 CTAs using OsiriX software. All CTAs were placed in the same anatomical position. MOFA was identified in the sagittal and coronal plane and its correlation with ASB was analyzed. The distance between the MOFA and landmarks for endonasal surgery were obtained, determining the high risk areas for its injury. RESULTS: After arising from the anterior cerebral artery, the MOFA dives inferiorly towards the ASB, close to the midline (average distance of 1.5 mm), approaching the planum sphenoidale (average distance of 1.8 mm) and then ascends away from the ASB as it runs anteriorly, with an average distance of 4.4 mm in the region of the anterior wall of the sphenoid sinus and 12 mm in the region of the anterior ethmoid artery. CONCLUSIONS: The MOFA has an intimate relationship with the ASB and nasal cavity; the regions with the highest risk of surgical trauma are between the posterior ethmoid and the planum sphenoidale.