What is the appearance of a thrombus on echocardiography in the left atrial appendage?

In echocardiography, a thrombus within the left atrial appendage (LAA) typically appears as a white area. This echogenicity is due to the presence of fibrin and blood cells, which create a reflective surface that is more echogenic compared to the surrounding structures. The appearance of a thrombus can vary depending on its age and composition, but the general presentation is a bright or white area when assessed via transesophageal or transthoracic echocardiography.

In the context of identifying thrombi in the LAA, the appearance is a critical factor for diagnosis and assessment of thromboembolic risks, particularly in patients with atrial fibrillation. Understanding this characteristic assists clinicians in determining the appropriate management strategies, including the potential risk of stroke associated with existing thrombi.