Management of Mild Mural Thrombus of the Descending Thoracic Aorta

Initial Diagnostic Confirmation and Risk Assessment

The American College of Cardiology recommends confirming thrombus presence, size, mobility, and adherence characteristics using CT angiography or MRI of the entire thoracoabdominal aorta 1
Assess for high-risk features including mobile thrombus, poor adherence to the aortic wall, or location in high-flow areas that substantially increase embolic risk 1
Exclude cardiac sources of thrombus with transthoracic echocardiography and Holter monitoring 1

Initiate therapeutic anticoagulation immediately upon diagnosis—delaying anticoagulation significantly increases the risk of embolic stroke and limb loss 1
Start unfractionated heparin or low molecular weight heparin as bridge therapy while initiating warfarin 1
Target INR 2.0-3.0 for warfarin therapy 1
Monitor INR weekly during initiation and monthly once stable, maintaining time in therapeutic range >70% 1
Continue anticoagulation for a minimum of 6 months, with duration guided by repeated imaging to confirm thrombus resolution 1

Perform serial CT angiography to assess thrombus resolution at 2 weeks, 1 month, 3 months, and 6 months 1
Do not discontinue anticoagulation based solely on symptom improvement without imaging confirmation of complete thrombus resolution 1
Extend anticoagulation indefinitely if persistent aortic wall abnormalities remain or if underlying hypercoagulable state cannot be corrected 1

Assess limb viability immediately using Doppler signals 1
Perform urgent revascularization (thrombectomy or bypass) for salvageable limbs 1
Follow with definitive treatment of the aortic source (typically TEVAR) 1
Continue therapeutic anticoagulation throughout to prevent thrombus propagation 1

Do not confuse mural thrombus with intramural hematoma (IMH), which represents hemorrhage within the aortic wall rather than luminal thrombus and follows different management algorithms per the 2024 ESC guidelines 2