To Determine the Anatomical Location of the Sphenoid Sinus Ostium in Relation to the Surrounding Landmarks
Background: The knowledge of the anatomy of the central skull base, particularly the anatomical region around the sphenoid sinus, plays an important role in the stepwise surgical training for endoscopic transsphenoidal approaches. Hence, the present study was conducted to determine the anatomical location of the sphenoid sinus ostium in relation to the surrounding landmarks.
Materials and methods: The present study was carried out to determine the anatomical location of the sphenoid sinus ostium in relation to the surrounding landmarks on sixty sagittal head and neck sections of adult cadavers. The length of the sinus was measured. The distance of the ostium from the major anatomical landmarks was measured using Vernier calipers. Statistical analysis was performed with IBM SPSS Statistics (International Business Machines Corporation (IBM), New York, USA), version 22 for Windows.
Results: In the present study anatomical location of the sphenoid sinus ostium in relation to the surrounding landmarks on sixty sagittal head and neck sections of adult formalin-fixed cadavers was done. The length of the sinus on the right side (1.92cm) was less when compared to the left side (2.76 cm). The width of the sinus was found to be more on the left side (1.79 cm) when compared to the right side (1.12 cm). The distance of the ostium from choana on left side was more (3.32cm). The distance of the ostium from nasion on left side was more (4.92cm). The distance of the ostium from anterior end of the superior concha on left side was more (2.23cm). The distance of the ostium from basisphenoid on left side was more (4.01cm).
Conclusion: Endoscopic endonasal approaches through sphenoid sinus require more prudence due to the possible variability regarding sphenoid sinus ostium, pneumatization and neurovascular bony landmarks. The present study will help in the endoscopic surgical approach of sinus ostium using the various anatomical landmarks.
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