RIGHT-SIDED AND LEFT-SIDED INTERATRIAL SEPTAL ANEURYSM MIMICKING ATRIAL TUMOR AND STROKE

We report the cases of two patients with cerebral embolization and int eratrial septal aneurysm. Transesophageal echocardiography required fo r stroke showed right-sided interatrial septal aneurysm in the first p atient and left-sided interatrial septal aneurysm in the second. In th e two patients, interatrial septal aneurysm was mimicking atrial cysti c tumor or abscess. Significant internal carotid artery stenosis was f ound in the first patient and aortic arch atheroma with mobile compone nts but no patent foramen ovale in the second patient. In the two pati ents, interatrial septal aneurysm appears to be only an incidental fin ding and not the true cause of stroke. Furthermore, we discuss the dif ferential diagnoses of atrial masses.