Aorticoright atrial tunnel.

Two unusual cases of aorticoright atrial tunnel are described. Both patients were referred to our institution for evaluation of a continuous heart murmur best heard along the right upper sternal border. Ascending aortography showed the tunnel taking its origin from the aortic root and entering the right atrium through a tortuous link. Both patients underwent surgical closure. In addition, a review of similar cases in the literature is presented.