<prompt> Epidermoids can be differentiated from arachnoid cyst on MRI by:Contrast enhancementSmooth marginsRestricted diffusionCSF signal on FLAIR  <response>: C i.e. Restricted diffusion Epidermoids can be differentiated from arachnoid cyst characteristically by hyper-intense diffusion weighted images because of restricted diffusion of epidermoid cystQ. FLAIR and proton images are less specific than DWI. 