A radiopaque marker includes a core wire having a proximal portion and a distal portion, and a coil wrapped around the distal portion of the core wire. The core wire is formed from a shape memory material and the coil is formed from a radiopaque material. The radiopaque marker includes a delivery configuration wherein the radiopaque marker is substantially elongated and a deployed configuration wherein the distal portion of the raadiopaque marker forms a substantially helical tube.
