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Transcatheter closure of a very large oval atrial septal defect. (A) Very large atrial septal defect with maximum diameter measured at 44 mm on transoesophageal echocardiography; (B) 3D reconstruction demonstrates the crescent shape of the defect with a much smaller transverse diameter; (C) transthoracic echocardiography in 4-chambers view shows good position of the device after successful closure with a 40 mm Amplatzer ASO. ASO, Amplatzer septal occluder.
