Analysis of Distance of Frontal Sinus Ostium from Columella by CT PNS: Our Experience.

Introduction: Knowledge of variable anatomy, narrow frontal sinus ostium and vital anatomical structures near outflow tract, is very important during preoperative planning for exposure of the frontal sinus recess during endoscopic sinus surgery. Preoperative knowledge of distance of nasofrontal beak and anterior skull base from columella is very helpful in avoiding intraoperative complication by deeper penetration into cranial cavity. Aim: To analyse distance from columella to the anterior and posterior border of the Frontal sinus ostium in males and females by CT PNS. Materials and methods: This retrospective observational study carried out in katihar medical college, Katihar during the period of 01 July 2021 to 31 December 2021 including 31 patients. Result and Conclusion: A distance approx 60.9 mm in men and 57.34 mm in women from the columella to frontal sinus ostium is safe during endoscopic sinus surgery. [ABSTRACT FROM AUTHOR]