<prompt> Abdominal aortic aneurysm is operated when the size is more than:35 mm45 mm55 mm65 mm  <response>: Ref. Sabiston Textbook of Surgery. Pg. 1723 INDICATIONS FOR OPERATIONAsymptomatic Aneursym 55mm in anteroposterior diameter.Patient fit for surgery expected mortality rate 5Indications for endoluminal operation are the same as for open operation .Symptomatic .Aneursym of any size that is painful or tenderAneursym of any size that is causing distal embolisation .Indications are wider than for an asymptomatic lesion expected mortality rate 5-20 