A method of making a contoured internal limb (22) including providing a flattened tubular segment (10) of graft material, and a prosthesis including the contoured internal limb. The tubular segment (10) includes a left lateral edge (30), a right lateral edge (32), a first length extending from the left lateral edge (30) to the right lateral edge (32), and a second length extending from a proximal end to a distal end of the tubular segment. The method also includes contouring a proximal portion(34), a middle portion (36), and a distal portion (38) of the contoured internal limb from the tubular segment. The method also includes closing a right lateral edge of the proximal portion and a right lateral edge of a first section of the middle portion. The method further includes removing the proximal, middle and distal portions of the contoured internal limb from the tubular segment and maintaining a second section of the middle portion as circumferentially continuous.
