an endoluminal prosthesis having modular branches is described, and systems and methods for facilitating deployment of the endoluminal prosthesis. In one example, the endoluminal prosthesis comprises a graft (12) including a bifurcated body of a biocompatible material. The bifurcated body includes distally extending limbs (18a, 18b). Limb extensions (60, 80, 90) can be longitudinally and circumferentially adjusted prior to mating with the limbs to enable an "off-the-shelf" prosthesis that can conform to various complex anatomy. When adjusted and mated, fenestrations (66, 86, 94) in the limb extensions can align with branch vessels.
