The present disclosure relates to an apparatus and method for deployment of a modular stent-graft system. In one embodiment, a modular system comprises a first stent graft having a tapered zone, a second stent graft configured for insertion within the first stent graft, the second stent graft comprising a tapered zone, wherein each tapered zone has an angle of taper and the angle of taper of the tapered zone of the second stent graft is substantially the same as the angle of taper of the tapered zone of the first stent graft, and wherein when the second stent graft is disposed within the first stent graft, the tapered zone of the second stent graft conforms precisely to the tapered zone of the first stent graft.
