Exceptional Vast Pneumatization of Sinus of Sphenoid Bone: A Rare Anatomical Variation

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Abstract
The wide variability of sphenoid sinus morphology and pneumatization attracted the attention of anatomists to identify and formulate updated descriptions and classifications. These assessments are essential in preventing the complications associated with the transsphenoidal surgery. Skull Computed Tomography images of a 30-year-old Saudi healthy female with a rare accidentally found anatomical variant of sphenoid sinus pneumatization were analyzed and morphometrically assessed. The sphenoid sinus was considered as combined presellar, sellar and postsellar types with pneumatization extensions in the anterior clinoid processes, pterygoid processes, greater wings and lesser wings of sphenoid. The maximum dimensions (width, length, and height) of the sinus were 6.88, 3.09, and 3.19 cm respectively with an average volume of the whole sphenoid sinus of 29.854 cm3. A detailed case-wise preoperative radiological evaluation as well as more screening studies are required to identify such rare cases.

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