Article Figures & Data
Figures
- Fig 1.
Transverse sinus giant AG. A, Axial nonenhanced CT with a bone algorithm shows cystic expansion of the diploic space adjacent to the left TS (arrow). B, Axial T2WI shows a large AG in the left TS with 2 internal septations (arrows) and subarachnoid spaces converging at the base of the AG (open arrow). C, Axial FLAIR image demonstrates incomplete suppression of fluid within the margins of the intra-AG septations (arrow) and complete suppression of intra-AG fluid outside the septations. D, Axial fat-saturated postcontrast T1WI shows linear enhancement at the posteromedial margin of the AG, most likely representing an intra-AG vein. The soft-tissue septations themselves do not enhance.
- Fig 2.
Superior sagittal sinus giant AG. A, Sagittal T1WI shows a giant AG in the SSS. Note that fluid in the AG (arrow) is hyperintense to CSF. A distinct linear flow void (open arrow) is seen. B, Sagittal T2WI shows that fluid is mixed iso- and hypointense to CSF. A distinct intra-AG vein is present (open arrow). C, Axial FLAIR image shows that intra-AG fluid (arrow) is not suppressed. Phase dispersion (curved arrow) is present around the linear flow void entering the AG. D, Postcontrast fat-saturated T1WI shows an enhancing vein entering the AG (arrow) and enhancing veins (open arrows) within the AG itself. E, Axial DWI shows that fluid within the AG does not demonstrate restricted diffusion. F, Lateral DSA, venous phase, shows a filling defect in the SSS caused by the giant AG (arrow). Note veins (open arrows) within the AG.
- Fig 3.
TS giant AG with a soft-tissue mass. A, Coronal T2WI shows a 1-cm AG in the right TS. Fluid (arrow) is of CSF signal intensity; soft tissue (curved arrow) projects into the AG lumen through an opening in the dura. Note the flow void from a vein (open arrow) in the AG. B, Coronal inversion recovery image shows that of pedunculated soft tissue (arrow) at the base of the AG is isointense with adjacent gray matter, while the fluid is isointense with CSF. C, Coronal contrast-enhanced scan shows enhancement of a vein (open arrow) within the AG. Soft tissue (curved arrow) does not enhance.
- Fig 4.
Cross-sectional graphic of a giant venous sinus AG projecting into a dural venous sinus. A core of CSF-filled collagenous trabeculation (open arrows) extends from the subarachnoid space into the granulation and is covered by an apical cap of arachnoid cells. CSF channels (arrows) extend through the cap to the sinus endothelium and drain CSF into the venous circulation. A vein (curved arrow) also courses through the body of the AG, penetrates the arachnoid cap layer, and empties into the dural venous sinus. Graphic is used with permission from Amirsys Inc., Salt Lake City, Utah
