The left atrial appendage is the most common site for cardiac thrombus. It is anatomically attached to the left inferior portion of the left atrium and consists of muscular trabeculae. The left atrial appendage does not contribute, to a large degree, to overall cardiac output. CT is a very sensitive modality for detection of intracardiac thrombus. CT can result in false-positive findings such as circulatory stasis, which is also seen as a filling defect on CT images. A further assessment with delayed imaging of the LAA after 1 to 2 minutes can improve the specificity for distinguishing circulatory stasis from thrombus.

Case Courtesy: Dr.ssa Luisa Coletta