Evaluation of Anatomy of the Maxillary Sinus Ostium: An Institutional Based Cadaveric Study
Background: Size, shape of maxillary sinus differs from individual to individual even both the same side of a same person. Variation in the landmark of maxillary sinus implies a significant challenge to a surgeon. Therefore, the aim of the present study was to assess the anatomy of maxillary sinus ostium.
Methods: The present observational study was carried out on 50 sagittal sections of head and neck of Indian origin. The cadavers used in this study. The middle meatus was then studied for the variations possible in the opening of the maxillary sinus ostium. The following parameters were taken into consideration: Position of the ostium (anterior/middle/ posterior) in the hiatus semilunaris, Shape of the ostium, Vertical and horizontal diameters of the ostium, Perpendicular distance from the ostium to the lower border of the inferior concha and upper border of the hard palate. The data obtained were tabulated and analyzed using Statistical Package for the Social Sciences, Version 21.0 (SPSS, Chicago, IL).
Results: In the present study, the maxillary sinus ostium was located in the anterior 1/3rd in 18% of the cases, in the middle 1/3rd in 34% of cases and posterior 1/3rd of the hiatus semilunaris in 48% of the cases. The shape of ostium was observed as oval in 58% of cases and circular in 42% of cases. The mean vertical diameter of the ostium was found to be 2.04mm and mean horizontal diameter of 2.54 mm. The perpendicular distance from the maxillary ostium to the lower border of the inferior concha was found to be 15.01 mm and perpendicular distance from the maxillary osmium to the upper border of hard plate was found to be 17.1 mm.
Conclusions: This study concluded that the maxillary sinus ostium was found in posterior 1/3rd of the hiatus semilunaris in maximum cases. The shape of ostium was observed as oval in maximum cases. The mean horizontal diameter was greater than mean vertical diameter of the ostium.
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