Relation between bronchial and pulmonary artery anatomy in heterotaxy

Anatomy of the relationship of bronchi to pulmonary arteries.
(A) Normal: Anterior view with a right mainstem bronchus to its first branch (right upper lobar bronchi) located above the right pulmonary artery (eparterial bronchus), whereas the left bronchus has a longer course from the carina to its first branch point below the left pulmonary artery (hyparterial bronchus).
(B) Right atrial isomerism: Anterior view with bilateral short eparterial bronchi with pulmonary arterial branches located anterior to bronchi.
(C) Left atrial isomerism: Anterior view of bilateral long hyparterial bronchi.
(D) Left atrial isomerism (posterior): Posterior view with pulmonary arteries superior to bronchi.