CTICasesProximal Interruption of the Right Pulmonary Artery with Severe Pulmonary Hypertension
Imaging findings
In a middle-aged patient, CT shows marked asymmetric enlargement of the main and left pulmonary arteries with severe pulmonary arterial hypertension, right ventricular hypertrophy and dilation with septal flattening, and interruption of the proximal right pulmonary artery; the right lung shows a patchy, mosaic perfusion pattern.
Key takeaways
Proximal interruption of a pulmonary artery, with the affected lung supplied instead by systemic collaterals, causes marked contralateral pulmonary artery dilation and severe pulmonary hypertension from the redistributed flow, and produces a mosaic perfusion pattern in the affected lung from the collateral systemic supply.
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