A stent graft for placement in a lumen of a patient is disclosed. The stent graft comprises: a main tubular body (20) of a biocompatible graft material having a main lumen (30), the main tubular body (20) having a proximal end and a distal end a side arm (30) extending from the main tubular body (20), the side arm (30) having a side arm lumen, the side arm lumen being in fluid communication with the main lumen (22) through a side arm opening in the main tubular body and a cannulation pocket (40). The pocket (40) comprises: an exit aperture positioned opposite the side arm opening an entry aperture longitudinally spaced from the entry aperture in a direction toward the distal end of the main tubular body (20) and a wall (44), the wall (44) laterally spaced from the main lumen (22) so as to provide a guide surface for a cannula fed through the entry aperture.
