title: An intriguing intracardiac mass in a woman with atrial fibrillation. Left atrial appendage (LAA) thrombus.
abstract: BACKGROUND
  A 74-year-old hypertensive woman presented with shortness of breath. There was no associated coughing, chest pain or fever. ECG identified atrial fibrillation with rapid ventricular response. A transoesophageal echocardiogram was scheduled to exclude thrombus before cardioversion (Figure 1A); however, an echogenic structure was seen (Figure 1B arrow, see online supplementary video 1) between the left atrium, the pulmonary artery and the aortic root.
  
  
  OBJECTIVE
  Which of the following is the most likely diagnosis? A. Aortic valve endocarditis with annular abscess. B. Left atrial appendage thrombus. C. Left atrial myxoma. D. Pulmonary embolism.
authors.affiliation: Department of Cardiology, Ca' Foncello Hospital, Treviso, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Chirillo
authors.affiliation: Department of Radiology, Ca' Foncello Hospital, Treviso, Italy.
authors.forename: Michele
authors.initials: M
authors.lastname: Fusaro
authors.affiliation: Department of Radiology, Ca' Foncello Hospital, Treviso, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Morana
authors.affiliation: Department of Cardiology, Ca' Foncello Hospital, Treviso, Italy.
authors.forename: Zoran
authors.initials: Z
authors.lastname: Olivari
mesh_terms: D000368:Aged; D020517:Atrial Appendage; D001281:Atrial Fibrillation / Q000209:etiology; D019560:Echocardiography, Three-Dimensional; D005260:Female; D006331:Heart Diseases / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D061330:Multidetector Computed Tomography; D064847:Multimodal Imaging / Q000379:methods; D013927:Thrombosis / Q000150:complications* / Q000175:diagnosis*