the present invention relates to a stent suitable for chimney grafting comprising a sheath and a tubular framework defining an aperture , characterized in that it comprises , at one end of the sheath , at least one bucket formed toward said end so as to form a depression in said sheath able to mate with a collateral stent . the invention is applicable to the treatment of vascular pathologies , in particular to treat aneurysms . more particularly , the stent according to the invention is an endoprosthesis designed to be placed in parallel with at least one other endoprosthesis .