Epidermoids can be differentiated from arachnoid cyst on MRI by:: (A) Contrast enhancement, (B) Smooth margins, (C) Restricted diffusion, (D) CSF signal on FLAIR
Answer is C. 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.