FIG 1. "Prominent perivenular spaces" sign in a 43-year-old patient with multiple sclerosis. (A) Proton attenuation image (TR/TE, 7900/17) shows a widening perivenular space as stringlike hyperintensity (arrows) projecting radially from 2 small multiple sclerosis lesions following the course and configuration of deep venular structures. (B) FLAIR MR image (TR/TE/TI, 9010/92/2500) shows the increased intensity (arrows) (not cerebrospinal fluid intensity) within these prominent perivenular spaces. (C) Enhanced T1-weighted image (TR/TE, 600/27) shows an enhancing vein (arrow) in one lesion. (D) Proton attenuation image shows another lesion (arrow) with this prominent perivenular spaces sign.