Bronchogenic cyst, also known as inclusion cyst, is a type of congenital endodermal heterotropia derived from an abnormal development of the ventral diverticulum of the foregut or the tracheobronchial tree during embryogenesis. Its interatrial localization is extremely rare and making a final diagnosis without surgery challenges the clinician. Herein, we report a 58-year-old male patient who had an interatrial bronchogenic cyst related to transient ischemic attack.