Midaortic syndrome (MAS) is a rare vascular disease that commonly causes renovascular hypertension. The lumen of the abdominal aorta narrows and the ostia of the branches show stenosis. MAS is associated with diminished pulses in the lower extremities compared with the upper extremities. severe hypertension with higher blood pressure in the upper rather than lower extremities. https://allfixelectricales.shop/product-category/schrader-valve/