DSA--a helpful tool in diagnosis of aberrant left pulmonary artery (vascular sling) in adults.

Two new adult patients with aberrant origin of the left pulmonary artery from the right pulmonary artery--pulmonary artery sling--are described, totalling the published adult cases to eight. Differentiation from a mediastinal mass closely mimicking this vascular anomaly is discussed. For the definitive diagnosis, digital subtraction angiography was applied for the first time. The clearest demonstration of the anatomy is in 20-25 degrees RPO and 20-25 degrees sitting position. The aberrant left pulmonary artery in adults is asymptomatic.