Giant arachnoid granulation
Loading Stack -
0 images remaining
There is a rounded well-defined lesion (13 mm) within the posterior aspect of the superior sagittal sinus (SSS) of low signal intensity on T1WI/FLAIR, high signal intensity on T2WI with no enhancement on the postcontrast sequence. The MRV (2D-TOF) shows a focal filling defect of the SSS at the same level. Note small intrinsic vessels crossing this lesion on the post-contrast sequence which represents displaced cortical veins or channels.
A small pineal cyst (12 mm) is noted of low signal on T1WI, high signal on T2WI with no restricted diffusion (incidental finding).
Intrinsic vessels within giant arachnoid granulations are described in the literature and appear to be displaced cortical veins or channels 1.