title: Black defects in severe spontaneous echo contrast teach us the protective aspect of mitral regurgitation visually.
authors.affiliation: Department of Cardiology, St. Luke's International Hospital, Tokyo, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Mizuno
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Takao
authors.forename: Koichiro
authors.initials: K
authors.lastname: Niwa
keywords: Left atrial thrombus; Mitral regurgitation; Spontaneous echo contrast
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