text: An<unk>  <unk>  is an abnormal connection or passageway between an artery and a vein. It may be congenital, surgically created for hemodialysis treatment, or acquired due to a pathologic process, such as trauma or erosion of an arterial aneurysm. These communications can occur at any point in the vascular system; varying in size, length, location, and number.
option_0: Arteriovenous fistula
option_1: Pseudoaneurysm
option_2: Coronary artery fistula
option_3: Arterial thrombosis
option_4: Pulmonary arteriovenous fistula
option_5: Venous ulcer
option_6: Varicose veins
option_7: Gas gangrene