label: Dural tail sign
label_lc: dural tail sign
description: "This sign represents thickening and enhancement of the dura mater in continuity with a mass, which on MR images, gives the appearance of a tail arising from the mass. The dural tail is thought to represent reactive change; however, it may also be due to tumor invasion. Three criteria need to be met for a positive dural tail sign: the tail should be seen on two successive images through the tumor, it should taper away from the tumor, and it must enhance more than the tumor."