Table 1.

Features of laterality disturbances.

Right atrial isomerism	Left atrial isomerism
Bilateral right bronchi	Bilateral left bronchi
Midline liver	Midline liver
Asplenia	Polysplenia (often functionally asplenic)
Malrotation	Malrotation
Two sinoatrial nodes	Absent sinoatrial node (complete heart block can occur, but more usually an ectopic atrial rhythm)
By definition total anomalous pulmonary venous connection	Interrupted IVC with azygous continuation