7. An 84-year-old man is brought to the emergency department 30 minutes after an episode of syncope. Transthoracic echocardiography shows a 4-cm myxoma occupying the majority of the left atrium. The tumor will be excised using a robotically assisted operation via an oblique right atriotomy and transection of the interatrial septum. When making the incision into the left atrium to remove the myxoma, which of the following regions of the interatrial septum should be avoided in order to prevent injury to the cardiac conduction system? A) Crista terminalis B) Fossa ovalis region C) Posteroinferior region above the opening of the coronary sinus D) Superoanterior region above the limbus of the fossa ovalis E) Superoposterior region posterior to the fossa ovalis D

7. An 84-year-old man is brought to the emergency department 30 minutes after an episode of syncope. Transthoracic echocardiography shows a 4-cm myxoma occupying the majority of the left atrium. The tumor will be excised using a robotically assisted operation via an oblique right atriotomy and transection of the interatrial septum. When making the incision into the left atrium to remove the myxoma, which of the following regions of the interatrial septum should be avoided in order to prevent injury to the cardiac conduction system? A) Crista terminalis B) Fossa ovalis region C) Posteroinferior region above the opening of the coronary sinus D) Superoanterior region above the limbus of the fossa ovalis E) Superoposterior region posterior to the fossa ovalis D