[Abnormal vascularisation of the right inferior pulmonary lobe by an aberrant coronary artery. Apropos of 2 uncommon cases].

Pulmonary vascularisation by the coronary vessels does not seem to have been previously described. The authors report 2 cases of vascularisation of the righ lower lobe by an atrial branch of the right coronary or circumflex arteries. Several pathogenic hypotheses are discussed. No definite conclusions can be drawn despite postmortem examination in one case. Pulmonary sequestration would seem to be very probably although there are a few contradictory findings. Acquired inflammatory conditions alone or associated with the congenital malformation cannot be excluded. These anomalies pose difficult therapeutic problems for cardiologists as they are discovered during coronary angiography for angina. The question of a "pulmonary steal" syndrome aggravating the coronary insufficiency possibly requiring both a pulmonary and a cardiac operation may be raised. From the pulmonary point of view, other methods of investigating patients with pulmonary sequestration and haemoptysis of unknown origin could be indicated.