Myocardial Uptake of Tc-99m Macroaggregated Albumin During Perfusion Lung Scanning

The authors present a case of extrapulmonary Tc-99m macroaggregated albumin uptake in a patient with reversed atrial septal defect and cleft lip. Perfusion lung scanning was performed to rule out pulmonary embolism because of dyspnea, cyanosis, and tachy-arrhythmia. Besides minimal systemic activity, significant myocardial uptake of the tracer was observed. Coronary angiography could not be performed because of the severely altered general condition of the patient. It was postulated that this was most probably due to an anomalous origin of the left coronary artery from the pulmonary trunk.