title: A case of right atrial appendage aneurysm mimicking a pericardial cyst on echocardiogram.
abstract: Right atrial appendage aneurysms (RAAAs) are rarely encountered. If symptomatic, they present with atrial arrhythmias or embolic events. Surgical resection is indicated for symptomatic patients. We describe a 65-year-old man presenting with palpitation for 6 months. Electrocardiogram showed atrial flutter. Transthoracic echocardiography revealed a large thin-walled cystic mass anterior to right ventricular outflow tract, which was confirmed to be a giant RAAA by contrast transoesophageal echocardiography and later by contrast-enhanced computerised tomography. The patient underwent electrocardioversion, following which he remained in sinus rhythm and was asymptomatic during the 3 months follow-up period.
  
  
  CONCLUSIONS
  RAAA can present with atrial flutter.Transoesophageal contrast echocardiography is the most valuable non-invasive tool in diagnosis of RAAA.Although computed tomography scan is not necessary for establishing the diagnosis, it may provide useful information regarding the structural anatomy.
authors.affiliation: Tabriz University of Medical Sciences , Tabriz , Iran.
authors.forename: Mehrnoush
authors.initials: M
authors.lastname: Toufan
authors.affiliation: Tabriz University of Medical Sciences , Tabriz , Iran.
authors.forename: Leili
authors.initials: L
authors.lastname: Pourafkari
authors.affiliation: Tabriz University of Medical Sciences , Tabriz , Iran.
authors.forename: Fariborz
authors.initials: F
authors.lastname: Akbarzadeh
authors.affiliation: University at Buffalo , Buffalo, New York , USA.
authors.forename: Nader D
authors.initials: ND
authors.lastname: Nader