The proof is in the appendage: A case report of a fenestrated membrane overlying the left atrial appendage.

A 35-year-old man with history of recurrent arrhythmias presented for pulmonary vein isolation. He underwent pre-procedural screening for thromboembolism risk with transesophageal echocardiogram. He had an incidental finding of a rare fenestrated membrane overlying his left atrial appendage.

Dueling Myxomas: A Rare Finding.

• Multiple cardiac myxomas are rare, most commonly seen in the left atrium. • Myxomas are most commonly attached on the left atrial side of the interatrial septum. • Echocardiography is key in acute CVA to identify cardioembolic sources.