CTICasesProximal Interruption of Left Pulmonary Artery
Imaging findings
Chest radiograph and CT show left lung volume loss with the right lung extending across the midline. There is a right-sided aortic arch and complete absence of the proximal left pulmonary artery, with abundant transpleural collaterals.
Key takeaways
Proximal interruption of a pulmonary artery is typically associated with a contralateral aortic arch (e.g., absent left PA with right arch). It causes ipsilateral volume loss and systemic collateralization.
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