According to 2011 ACCF/AHA Management of Patients With Peripheral Artery Disease (Lower Extremity, Renal, Mesenteric, and Abdominal Aortic) Pocket Guide p 54, Fig 11 “Management of Abdominal Aortic Aneurysms” For asymptomatic infrarenal AAA “4 cm to 5.4 cm” “Ultrasound scan every 6 to 12 mo” is recommended. For asymptomatic “Pararenal, suprarenal, or Type IV thoraco-abdominal” AAA “4 cm to 5.4 cm”: “ ___________ ” is recommended.