CTICasesFontan Flow Artifact mimicking PE
Imaging findings
Initial CT chest in a post-Fontan/Glenn patient shows non-diagnostic filling defects in the pulmonary arteries. Repeat CT with a delayed (75-second) protocol shows homogeneous contrast opacification and rules out PE.
Key takeaways
Congenital heart disease repairs like Fontan/Glenn create complex mixing of blood. Standard early-phase CT scans can show flow/mixing artifacts that mimic PE; a 70-75 second delay is necessary to obtain diagnostic scans.
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