CTICasesLeft Atrial Filling Defect
Imaging findings
A bizarre, polypoid filling defect in the left atrium, located along the crista terminalis / coumadin ridge.
Key takeaways
While often a normal variant (a pectinate muscle bundle), it is difficult to definitively exclude thrombus or myxoma on CT. Further workup, such as an echocardiogram or MRI, is recommended for clinical correlation.
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