A sinus venosus atrial septal defect is diagnosed by echocardiography with an unusual bubble study.
Dorosz JL, Fonseca BM, Kay JD, Graham BB, Salcedo EE, Quaife RA. A sinus venosus atrial septal defect is diagnosed by echocardiography with an unusual bubble study. Echocardiography. 2013 Jul; 30(6):E182-3.