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[Anomalous left coronary artery origin from the pulmonary artery causing angina: Report of one case].

Anomalies of the origin of coronary arteries are detected in 0.5-1.5% of all angiographies. Anomalous origin of the left main trunk is the most uncommon and its origin from pulmonary artery in adults is exceptional, usually because it is associated with a short survival. We report a 49-year-old female, presenting with a two months history of angina. The exercise electrocardiogram suggested ischemia. A coronary angiography was performed, showing the absence of the left main trunk in the left coronary sinus, a dilated right coronary artery, with no lesions and extensive collateral circulation to the anterior descending and circumflex arteries, with inverted flow and the left main trunk draining to the pulmonary artery. The left ventricle was mildly dilated with middle and apical anterior hypokinesia. Global systolic function was conserved. A surgical correction was decided, occluding the left main anomalous origin and performing a coronary artery bypass grafting from the left internal thoracic artery. The patient was discharged with no complications. At two years of follow-up she is symptom free and has a normal physical capacity.