A 48-year-old woman was brought with altered sensorium since two weeks
MRI of the brain shows concavo- convex T2 hyperintense, Tl hypointense subdural collections along both the cerebral convexities. The maximum thickness is 9 mm on the right and 5 mm on the left. These collections do not show diffusion restriction on DWI or susceptibility on SWI. There is mild effacement of adjacent sulci. The ventricles are normal.