[A right atrial thrombus after Fontan procedure--a case report].

A 17-year-old male with tricuspid atresia who underwent a modified Fontan procedure died due to heart failure 4 years and 6 months after operation. At autopsy a thrombus was found in the right atrial appendage. From the experience, it might be recommended to excise the appendage when the modified Fontan procedure leaving the appendage was employed. In addition, anticoagulation therapy as well as regular echocardiographic examination for detecting thrombus formation should be considered after the operation.