MR OF GIANT ARACHNOID GRANULATION, A NORMAL VARIANT PRESENTING AS A MASS WITHIN THE DURAL VENOUS SINUS

We report three cases of masses within the cerebral dural venous sinus es shown with either MR or angiography. The dural venous sinuses of 10 patients without known venous disease were examined at autopsy. In tw o patients, three giant arachnoid granulations were identified, On the basis of the literature and our limited autopsy series, we suggest th at these lesions identified at imaging are giant arachnoid granulation s, normal variants of no known clinical significance.