CTICasesLeft Upper Lobe Partial Anomalous Pulmonary Venous Return
Imaging findings
Chest CT and radiographs demonstrate an anomalous vertical vein in the left upper chest that does not obscure the aortic arch. The anomalous vessel is an anomalous pulmonary vein draining the left upper lobe of the lung, which courses superiorly to connect with the left brachiocephalic vein.
Key takeaways
Partial anomalous pulmonary venous return of the left upper lobe is a congenital vascular anomaly where the left superior pulmonary vein drains into the left brachiocephalic vein instead of the left atrium. It is often asymptomatic and detected incidentally on chest imaging, but can lead to a left-to-right shunt and right heart volume overload if the shunt volume is large.
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