A rare case of a double atrial septum in a 4-year-old boy with a large an ostium secundum atrial septal defect

Abstract

The work presents a case of a 4-year-old boy diagnosed with a large atrial septal defect type ostium secundum (ASD2) and additional abnormal structures in the direction of the left atrium in the echocardiogram. The patient was qualified for interventional defect closure, however, in the transoesophageal echocardiography, in addition to a very large ASD2 (approx. 2 cm), a double interatrial septum was diagnosed. The extra wall layer was parallel to the atrial septum and did not obstruct blood flow from the pulmonary veins or through the mitral valve. No signs of clotting material were observed in the space between the two layers. The closure was withdrawn during cardiac catheterization and the boy was qualified for scheduled surgery. Currently, the boy is asymptomatic and leads a normal lifestyle.