an imageable extendable stent apparatus for insertion into a bifurcating vessel or a vessel opening . the stent apparatus comprises a main stent and a flared stent , which may used individually or in combination with each other . the flared stent may be interlocked with the main stent to provide stent coverage over the entire region of a bifurcation . the main stent of the apparatus may be deployed at the bifurcation point of a vessel , allowing unimpeded future access to the side branch of the bifurcated vessel . the flared stent may be employed at vessel openings . also disclosed and claimed are methods for implanting the extendable stent apparatus into the bifurcation point or the ostium of a subject vessel .