SURVEY OF FRONTAL ANGLE MEASUREMENT AND CORRELATION WITH FRONTAL OSTIUM ANTERIOR-POSTERIOR DIAMETER ON CT SCAN
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Abstract
Background: Endoscopic frontal sinus surgery is still a challenge for many surgeons because it has a complicated drainage pathway and involves dangerous structures including the skull base and anterior ethmoidal artery. The frontal sinus drainage pathway has three different parts that arranged to form the shape of an hourglass. Because the three constituent parts are not on a straight line, the frontal sinus drainage pathway has a curved, angled shape that limit the light source for endoscope and instruments to access the surgical field. In addition to anterior-posterior diameter and frontal cells, frontal angle may be a new prognostic factor before endoscopic frontal sinus surgery. Objective: To determine the measurement of the frontal angle in Vietnamese adults and frontal sinus complexity grading, we conducted the study: “Survey the measurement of frontal angle and its correlation with frontal ostium anterior-posterior diameter and frontal sinus complexity grading (according to ICC) on CT scan”. Methods: descriptive cross-sectional study with 105 patients undergoing nasal sinus MSCT at Ho Chi Minh ENT Hospital from January 2023 to August 2023. Results: the study shows male:female ratio = 1.1. The frontal angle measurements of 210 frontal recess range from 16.6⁰ to 90⁰. Average frontal angle measurement 60.3⁰±16.9⁰. Frontal ostium diameter anterior-posterior 7.8±1.6. There is a strong correlation between the measurement of the frontal angle and the anterior-posterior diameter of the frontal ostium (Pearson correlation coefficient: r=0.66, p<0.001). There is a significant difference in the average frontal angle in the least, moderate, most, and most complex frontal recess groups (p<0,001). Conclusion: the measurement of the frontal angle on CT scan is a new prognostic factor that is very useful when examining the frontal recess before surgery.
Keywords
frontal angle measurement, frontal sinus complexity grading
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References
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