Left atrial thrombus mimicking atrial myxoma on imaging studies in a patient with cardiac transplant.

Left atrial thrombus can develop in patients with atrial fibrillation and/or a dilated left atrium such as seen in patients with heart failure. In cardiac transplant patients with bi-atrial anastomosis, the suture line can be a potential nidus for thrombus formation. These thrombi can be either organized or unstable with ulcerated surfaces. We present a unique case of a left atrial mass in a cardiac transplant patient with features of atrial myxoma on imaging studies but found to be an organized thrombus on histopathology. .