CTICasesInterrupted bolus artifact
Imaging findings
CT pulmonary angiogram shows poor, gray opacification of the pulmonary arteries with a sharp contrast-blood interface and dense contrast in the superior vena cava and left atrium, which completely resolved on a repeat scan.
Key takeaways
The transient interrupted bolus artifact is a common pitfall on CT pulmonary angiograms. A deep inspiration increases venous return of non-contrast blood from the IVC, which dilutes the contrast bolus in the right heart and pulmonary arteries.
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