CTICasesPatent ductus arteriosus (PDA) with massive pulmonary artery aneurysm
Imaging findings
CT angiogram shows a large patent ductus arteriosus (PDA) with left-to-right shunting, causing a massive aneurysm of the main and branch pulmonary arteries. Layering in-situ thrombus is present in the main pulmonary artery, along with peripheral shunt vascularity and secondary left upper lobe bronchus compression.
Key takeaways
A large, long-standing PDA causes high-volume shunting, leading to severe pulmonary arterial hypertension and massive aneurysmal dilatation of the pulmonary arteries. In-situ thrombosis is common in the dilated vessels due to altered flow dynamics.
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