title: "Surprise visitor".
authors.affiliation: Department of Paediatric Cardiology, Royal Hospital, Muscat, Oman.
authors.forename: Eapen
authors.initials: E
authors.lastname: Thomas
authors.forename: Kinnari
authors.initials: K
authors.lastname: Bhatt
authors.forename: Salim Nasser
authors.initials: SN
authors.lastname: Al-Maskari
mesh_terms: D020517:Atrial Appendage / Q000000981:diagnostic imaging* / Q000601:surgery; D004314:Down Syndrome / Q000000981:diagnostic imaging* / Q000601:surgery; D005260:Female; D006343:Heart Septal Defects / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D007223:Infant; D014463:Ultrasonography