CTICasesGlenn and Fontan Flow Artifacts
Imaging findings
CT chest in a patient with repaired DORV/L-TGA shows hyper-enhancement of different lung lobules and vascular layering in the pulmonary arteries. The cardiac MRI shows normal shunt patency.
Key takeaways
In patients with Glenn and Fontan circulations, venous return from the upper and lower body bypasses the right heart and drains directly into separate pulmonary arteries. Rapid injection of contrast from a single venous access (e.g., upper extremity) causes unequal flow and layering artifacts that can mimic pulmonary emboli.
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