A tube inserted into an artery to measure pressure, remove blood, inject medication or a radiographic contrast media, and used to perform an interventional radiological procedure: "Jim's doctor told him that a long slender flexible tube or arterial catheter would be used for inserting into one or more of his natural bodily cavities or passages in order to withdraw fluid; such as, urine and/or blood."

Patchy atrophic scarring of the kidney as a result of the arteriosclerotic narrowing (hardening due to fibrosis or calcium deposition) of the lumens (cavities or channels) of large branches of the renal artery (abdominal aorta which supplies the kidneys).

It occurs in elderly people or in hypertensive people and occasionally causes hypertension.