Arachnoid Granulations and Cerebrovenous Sinus Thrombosis

imaging features include asymmetrically decreased enhancement and lateral bulging of the affected sinus. Arachnoid granulations are normal structures that protrude into the lumen of the venous sinuses, which can be mistaken for failing defects. This is why using contrast is better. Hemorrhagic transformation, typically in the thalami, is seen in 20% of patients. MR-vinography and susceptibility-weighted MRI sequences should be used to confirm the diagnosis whenever bilateral thalamic edema is observed.