Proximal interruption of the right pulmonary artery: A rare anomaly.

We report a case of a 21-year-old woman with cyanosis where computed tomography (CT) angiography revealed a complete absence of the mediastinal part of the right pulmonary artery with the normal intrapulmonary vascular network, receiving supply from multiple collateral vessels. The case also highlights the various differential diagnoses and the role of CT angiography in arriving at the correct diagnosis.