I've been hearing about arachnoid granulations since 2010 but never saw an image of them before. Arachnoid granulations are little buds where cerebrospinal fluid drains into the venous sinuses.
Here's the full article, it's on cerebral venous thrombosis. http://radiographics.rsna.org/content/2 ... 1/S19.full
Although arachnoid granulations are a normal anatomic structure, if they are large and appear in the dominant sinus or only in the transverse sinus, they could cause venous obstruction and lead to symptoms of venous hypertension