Background/Purpose : This study is for the evaluate the location of sigmoid sinus relating to the external auditory canal using three-dimensional (3D) reconstruction image of temporal bone CT. Methods : Twenty well pneumatized twenty temporal bone CT aged between 20 and 50 were selected. Three-dimensional reconstruction image were obtained with V-works 4.0 software program (Cybermed, Seoul, Korea) using axial scan of high-resolutional temporal bone CT. The horizontal length from suprameatal spine of Henle to anterior and posterior border of sigmoid sinus were measured. The horizontal length from bony inferior lateral external auditory canal to anterior and posterior border of sigmoid sinus were measured. The angle between horizontal suprameatal line and imaginary line acquired from two points which cross the center sigmoid sinus from above two horizontal lines was measured. The angle between bony inferior lateral external auditory canal and imaginary line acquired from two points which cross the center sigmoid sinus from above two horizontal lines was measured. Results : The mean horizontal length from suprameatal spine of Henle to anterior and posterior border of sigmoid sinus were 16.24mm(±3.5) and 26.31mm(±4.1). The mean horizontal length from bony inferior lateral external auditory canal to anterior and posterior border of sigmoid sinus were 17.97mm(±5.8) and 29.47mm(±4.3). The mean angle between horizontal suprameatal line and imaginary line acquired from two points which cross the center sigmoid sinus was 80.82˚(±14.0). The mean angle between bony inferior lateral external auditory canal line and imaginary line acquired from two points which cross the center sigmoid sinus was 90.53˚(±0.36). Conclusion : The preoperative well understanding of sigmoid sinus location gave us a imaginary hint which avoid massive bleeding or morbidity before otologic or neurosurgery.
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