title: A heart within a heart.
authors.affiliation: Department of Cardiology, McGill University Health Centre, Montreal, Quebec, Canada. christopher.labos@mail.mcgill.ca
authors.forename: Christopher
authors.initials: C
authors.lastname: Labos
authors.forename: Shadi
authors.initials: S
authors.lastname: Akhtari
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D004452:Echocardiography; D004562:Electrocardiography; D006325:Heart Atria / Q000002:abnormalities* / Q000000981:diagnostic imaging; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male