<prompt> All of the following are risk factors for thoracic aoic aneurysm TAA rupture except:Symptomatic aneurysmConcurrent dissectionIncreased patient ageAnticoagulation use  <response>: TAAs are those occurring distal to the left subclan vein. The risk for rupture is increased with : Increasing aneurysm size Advanced age History of chronic obstructive pulmonary disease COPD Concurrent dissection. Anticoagulation is not a risk factor for rupture. 