CTICasesAortic Flow Timing Artifact
Imaging findings
CTA of the neck shows a well-defined filling defect in the descending thoracic aorta mimicking an aortic dissection flap. A follow-up dissection-protocol CT 14 minutes later shows a completely normal aorta, confirming a flow timing/mixing artifact in a patient with reduced ejection fraction.
Key takeaways
In patients with low cardiac output or reduced ejection fraction, slow flow and delayed mixing of contrast can create a leading-edge timing artifact in the descending aorta that simulates a dissection flap on early-phase scans.
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