This document discusses renovascular disease and mesenteric vascular disease. It begins by defining renal artery stenosis (RAS) as greater than 50% narrowing of at least one renal artery, with atherosclerosis and fibromuscular dysplasia (FMD) being the most common causes. It describes the pathophysiology of RAS leading to hypertension and ischemic nephropathy. Duplex ultrasonography is recommended as the first-line screening test for RAS, with CT angiography and MRA also used. Catheter angiography remains the gold standard. Medical management focuses on controlling risk factors and hypertension. Revascularization with angioplasty, stenting or surgery may be considered in certain cases to improve