Treatment of Mural Thrombus in the Descending Thoracic Aorta

Initial Diagnostic Confirmation

The American College of Cardiology recommends confirming thrombus characteristics using contrast-enhanced CT angiography or MRI to assess size, mobility, adherence to the aortic wall, and location 1, 2
Identify high-risk features, including mobile thrombus, poor wall adherence, or location in high-flow areas that substantially increase embolic risk 1
Exclude cardiac sources with transthoracic echocardiography and Holter monitoring to rule out concurrent cardiac thrombus 1, 2

The European Society of Cardiology recommends immediate anticoagulation as the standard of care, with unfractionated heparin or low molecular weight heparin as bridge therapy while initiating warfarin, targeting INR 2.0-3.0 1, 2
Continue anticoagulation for a minimum of 6 months, with duration guided by repeated imaging to confirm thrombus resolution 1, 2
Monitor INR weekly during initiation and monthly once stable, maintaining time in therapeutic range >70% 1, 2

Consider TEVAR as first-line therapy in scenarios with mobile or pedunculated thrombus, recurrent embolism despite therapeutic anticoagulation, contraindication to anticoagulation, or persistent thrombus after 3-6 months of anticoagulation 1
TEVAR demonstrates superior outcomes, with 93.1% complete thrombus exclusion and minimal recurrence rates compared to medical management alone, according to the European Heart Journal 3

Reserve open surgery for specific anatomical or technical limitations, such as severe tortuosity of iliac arteries, sharp angulation of aortic arch, absence of adequate proximal landing zone, or failed endovascular therapy 3, 2
Perform open surgery in a hybrid operating room with completion angiography capability to detect residual thrombus 2

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

If acute limb ischemia or visceral embolization occurs, assess limb viability immediately using Doppler signals and perform urgent revascularization (thrombectomy or bypass) for salvageable limbs 1, 2
Follow with definitive treatment of aortic source (typically TEVAR) to prevent recurrent embolization 1, 2
Continue therapeutic anticoagulation throughout to prevent thrombus propagation 1, 2

Do not confuse mural thrombus with intramural hematoma (IMH), as IMH represents hemorrhage within the aortic wall rather than luminal thrombus and follows different management algorithms per ESC guidelines 1, 4, 3
Do not delay anticoagulation once diagnosis is confirmed, as this is the single most important intervention to prevent catastrophic embolic events 1, 2