Estudo morfométrico do seio esfenoidal por meio da tomografia computadorizada

Numerous investigations regarding the morphology of the sphenoid sinus in images have been carried out, given its large variability in size, shape and quantity of septums. The knowledge of morphological variations of this particular sinus are extremely important, especially regarding details of surgical procedures that use this route of access. Objective: to analyze the frequent morphological variations on the sphenoid sinus by computed tomography (CT) scans. Methods: Sixty-six images of adult human skulls were studied, 31 female and 35 male. From the images, measures of height and total width of the sinus were accomplished, as well as the presence and number of septums. Results: 60.60% of the sinus presented height between 11 and 16 mm, 36.4% had a total width in the coronal sections between 23 and 28 mm, and 62.12% of the sample showed only one septum. Based on the analyzed data, it can be inferred that the sphenoid sinus is a constant structure and subject to several anatomical variations among the searched skulls concerning their measurements, being the average height 14.6 mm and the average width 26.1 mm. Conclusions: CT scan is a tool that clearly shows sinus variations, being an ally instrument in their investigation, and may be requested before surgery to prevent injuries on vital structures adjacent to the sinus.