Figure 1. MIP image from contrast-enhanced MR venography, with a color overlay, demonstrates the superior dural sinuses. They include the superior sagittal sinus (green), inferior sagittal sinus (light blue), straight sinus (dark purple), confluence of the sinuses (orange), transverse sinuses (dark blue), and sigmoid sinuses (yellow). The internal jugular veins and bulbs (light purple) also are depicted.
Figure 10a. (a) Contrast-enhanced CT image in a patient with superior sagittal sinus thrombosis shows a central filling defect in the superior sagittal sinus (arrow), surrounded by intensely enhanced dura mater. (b) Coronal reformatted image from contrast-enhanced MR venography in another patient shows a nonenhanced thrombus (arrows) surrounded by enhanced sinus walls and dural cavernous spaces. The thrombus extends from the superior sagittal sinus through the sinus confluence and into the right transverse sinus.
i. Cord sign :on plain CT, represents the spontaneous visualization of a thrombosed cortical vein; it’s rare .
ii. Dense triangle sign :reflects spontaneous SSS opacification by freshly clotted blood
iii. Empty delta sign : after contrast, it reflects the contrast between the opacified collateral veins in the SSS wall and non opacification of the clot inside the sinus.MC direct sign and seen approximately 35% of the cases.