[Diastolic coronary prolapse in partial left pericardial agenesis].

A few rare cases of coronary artery stenosis and occlusion have been reported in partial left pericardial agenesis. The authors report a privileged observation of partial left pericardial agenesis associated with an atrial septal defect in which diastolic collapse of the left marginal artery was demonstrated; this chronology was confirmed by synchronous analysis. The peroperative findings may explain the pathogenesis of the coronary disease encountered in this type of malformation, providing a new diagnostic sign of partial left pericardial agenesis.