The present disclosure provides methods and apparatuses for guiding an endovascular tool such as a puncturing tool or an angioscope, in a radial direction, such as toward or through the sidewall of a vessel, stent, or stent graft using elongate members and specialized catheters. The present disclosure provides methods and apparatuses for locating branch vessels from within a grafted main vessel while maintaining continuous blood flow to the branch vessel. Another aspect of the present disclosure involves a reverse cannulation system particularly useful for stenting the abdominal aorta proximate the renal arteries and stenting the renal artery.
