en پژوهشی اصيل Original Research <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span cambria="" style="font-family:"><span style="color:black">Aims:</span></span></b><span cambria="" style="font-family:"><span style="color:black"> Sphenoid sinus is one of the most inaccessible paranasal sinus, and is closely correlated to many vascular and neural structures. Anatomic variation of the sphenoid sinus can complicate surgery in this area. The present study aimed to define the sphenoid sinus variations and the relevant structures using cone-beam computed tomography.</span></span><span cambria="" style="font-family:"> <span style="color:black"></span></span></span></span></span><br> <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span cambria="" style="font-family:"><span style="color:black">Material & Methods:</span></span></b><span cambria="" style="font-family:"><span style="color:black"> This cross-sectional descriptive study was performed on cone-beam computed tomography of 129 patients. Simple random sampling was used to select cone-beam computed tomography to specify the sphenoid sinus anatomical variations. Data was gathered in the form and analyzed using the descriptive and analytic tests, including the Chi-square test.</span></span><b><span cambria="" style="font-family:"><span style="color:black"></span></span></b></span></span></span><br> <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span cambria="" style="font-family:"><span style="color:black">Finding:</span></span></b><span cambria="" style="font-family:"><span style="color:black"> The most common sphenoid sinus variations were observed for sagittal sellar (89.1%)</span></span><span cambria="" lang="EN" style="font-family:"> and the lowest was </span><span cambria="" style="font-family:">Sagittal conchal (1.6</span><span cambria="" lang="EN-GB" style="font-family:">%</span><span cambria="" style="font-family:">)</span><span cambria="" style="font-family:"><span style="color:black">. A significant difference was also found between the frequency of axial-anterior type pneumatization and </span></span><span cambria="" style="font-family:">Sagittal sellar</span><span cambria="" style="font-family:"><span style="color:black"> between age groups. But, no significant differences were found between males and females </span></span><span cambria="" style="font-family:"><span style="color:black">in term</span></span><span cambria="" style="font-family:"><span style="color:black">s of sphenoid sinus variations. Significant </span></span><span cambria="" style="font-family:">associations were also found between some </span><span cambria="" style="font-family:"><span style="color:black">sphenoid sinus variations </span></span><span cambria="" style="font-family:">(p<0.05).</span></span></span></span><br> <span style="font-size:10pt"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><b><span cambria="" style="font-family:"><span style="color:black">Conclusion: </span></span></b><span cambria="" style="font-family:"><span style="color:black">The sphenoid sinus has a highly anatomical structure variation. Sellar and pre-sellar type pneumatization are more common than conchal and post-sellar types. T</span></span><span cambria="" style="font-family:"><span style="color:black"></span></span></span></span></span><br> &nbsp; Sinonasal Tract,Anatomic,Sphenoid Sinus,Cone Beam Computed Tomography, 37 40 http://jccs.yums.ac.ir/browse.php?a_code=A-10-155-1&slc_lang=en&sid=1 Gh. Sabz 10031947532846005663 10031947532846005663 No Department of Otolaryngology, School of Medicine, Yasuj University of Medical Sciences, Yasuj, Iran M. Derakhshan 10031947532846005664 10031947532846005664 No General Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran S.R. Panahi roghayehpanahi2@gmail.com 10031947532846005665 10031947532846005665 Yes Department of Oral and Maxillofacial Radiology, School of Dentistry, Yasuj University of Medical Sciences, Yasuj, Iran