A stent may be formed of at least one structural material having a pattern including at least one serpentine structure, which extends about the longitudinal axis of the stent. The structure is formed of a plurality of struts. Adjacent struts are interconnected by end portions having inner turns and outer turns. At least some of the end portions are elongated and other end portions are non-elongated and have a predetermined length. At least one of said elongated end portions is configured to serve as a fiducial marker.