Arrangement shown is juxtaposition of atrial appendages. First figure is juxtapositioning of atrial appendages to the right side of great arteries. Second figure is juxtapositioning of atrial appendages to the left side of great arteries.
Left juxtapositioning (86%) is more common than right juxtaposition (14%) - based on autopsy study of 49 cases with juxtaposition.
Left juxtaposition is associated with complex heart defects more often than right juxtaposition.
Common associations with left juxtaposition are (i) Tricuspid atresia, (ii) Transposition and (iii) DORV.
Common associations with right juxtaposition are (i) Outflow tract obstruction, (ii) Anomalous venous return and (iii) DILV.
Ref:
1) Echocardiography in Pediatric Heart Disease by R. Snider et al. 2nd ed. 1997 (p.562)
2) Cardiovascular Pathology 2011; published online Apr 11, 2011
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