International Session 26　　Imaging and Medical Economics

Purpose: This study evaluates the prevalence of the accessory infraorbital foramen(AIOF)and its relationship with adjacent structures.Methods: A cross-sectional study was conducted using paranasal sinus CT scans of 151 patients aged 16 years or older at Ho Chi Minh City ENT Hospital from October 2022 to August 2023.Results and Discussion: The male-tofemale ratio was 1: 1, with a mean age of 45 1514 37 years.All cases had one infraorbital foramen(IOF)per side.The percent of the AIOF was 16 6, with 4 7 occurring bilaterally.There were no statistically significant differences in AIOF prevalence between sexes, sides with and without infraorbital nerve angulation.The mean distance of the AIOF to the infraorbital rim was 1 160 46 cm, and to the midface, 2 280 33 cm, with no significant differences by sex or side.The distance from IOF to adjacent structures showed no significant difference between cases with and without AIOF.Conclusions: AIOF has a high prevalence, often accompanied by accessory infraorbital nerve branches.Identifying its location is crucial for midface trauma surgery, facial aesthetics, and neurotomy radiofrequency ablation for pain management.