A stent, comprising: a stent structure comprising a first end, a second end, and a tubular wall extending therebetween, said tubular wall defining a lumen extending therethrough between said first and second ends, and said stent structure being expandable from a collapsed configuration to an expandable configuration, wherein a first portion of said stent structure extends toward said first end and a second portion of said stent structure extends toward said second end; and an arm disposed between said first end and said second end, said arm being self-expanding outward from said tubular wall, said arm thereby being adapted to engage a wall of a first passageway to position said first portion within said first passageway and position said second portion within a second passageway, said second passageway opening into said first passageway at said wall; wherein said stent structure comprises a series of zig-zag rings, said arm being connected at one end to one side of one of said zig-zag rings and extending through said zig-zag ring, a free end of said arm extending past an opposing side of said zig-zag ring, and an adjacent zig-zag ring along said opposing side being spaced farther from said zig-zag ring than an adjacent zig-zag ring along said one side, said free end being disposed within a space between said zig-zag ring and said adjacent zig-zag ring along said opposing side; and wherein said free end of said arm extending past said opposing side of said zig-zag ring comprises an enlarged portion with a width greater than a width of said arm extending through said zig-zag ring and a width of each strut forming said zigzag ring. a stent structure comprising a first end, a second end, and a tubular wall extending therebetween, said tubular wall defining a lumen extending therethrough between said first and second ends, and said stent structure being expandable from a collapsed configuration to an expandable configuration, wherein a first portion of said stent structure extends toward said first end and a second portion of said stent structure extends toward said second end; and an arm disposed between said first end and said second end, said arm being self-expanding outward from said tubular wall, said arm thereby being adapted to engage a wall of a first passageway to position said first portion within said first passageway and position said second portion within a second passageway, said second passageway opening into said first passageway at said wall; wherein said stent structure comprises a series of zig-zag rings, said arm being connected at one end to one side of one of said zig-zag rings and extending through said zig-zag ring, a free end of said arm extending past an opposing side of said zig-zag ring, and an adjacent zig-zag ring along said opposing side being spaced farther from said zig-zag ring than an adjacent zig-zag ring along said one side, said free end being disposed within a space between said zig-zag ring and said adjacent zig-zag ring along said opposing side; and wherein said free end of said arm extending past said opposing side of said zig-zag ring comprises an enlarged portion with a width greater than a width of said arm extending through said zig-zag ring and a width of each strut forming said zigzag ring.