Juxtaposition of the atrial appendages.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006344:Heart Septal Defects, Atrial / Q000473:pathology* / Q000601:surgery; D006345:Heart Septal Defects, Ventricular / Q000601:surgery; D006801:Humans; D007223:Infant; D008722:Methods; D014172:Transillumination; D014188:Transposition of Great Vessels / Q000473:pathology* / Q000601:surgery