Introduction
Left atrial appendage aneurysm (LAAA) is an extremely rare cardiac abnormality, which may lead to fatal complications such as thrombotic events, atrial fibrillation, and cardiac function deterioration. Robust evidence recommends surgical correction for patients who were diagnosed with LAAA even without any symptoms1. In this case, we reported an 18-year-old female who suffered from a giant congenital LAAA but without any symptoms, which was incidental detected echocardiography.