Abstract:

Objective: To locate the surface projection of transverse sinus on the skull using the connecting line between inion and low point of mastoid,and to provide the morphological foundation for infratentorial-supracerebellar approaches and other related approaches and to protect the transverse sinus. Methods: Eighty adult cases were scanned with thin-section CT.The skull 3D model was rebuilt by CT reconstruction technology for the marking of structures and measurements.The connecting line between the inion(A) and the low point of mastoid (B) was chosen as the marker line,and the morphological parameters of distances and projection from the groove of the transverse sinus to the connecting line were measured. Results: The width of marker point J in middle of transverse sinus on the right hemisphere was bigger than that on the left hemiphere (t=5.232,P<0.05);there were no statistical differences in the measurement values of h1,h2,h3,h4,h5,s1,s2,BE,BD,BJ, and BI from the marker points of groove of transverse sinus to the connecting line AB between two cerebral hemispheres(P>0.05);there were no statistical differences in the measurement values of h1,h2,h3,h4,h5,s1,s2,BE,BD,BJ,and BI from the marker points of groove of transverse sinus to the connecting line AB between genders (P>0.05). Conclusion: The surface projection of transverse sinus is obtained accurately with CT reconstruction image.The method is simple and accessible which can guide to protect transverse sinus during the operation.

Key words: transverse sinus, inion, mastoid, CT reconstruction, surface projection