CTICasesFibrin Sheath Mimicking Catheter/Filling Defect
Imaging findings
Initial CT identified a filling defect near a dialysis catheter tip. Subsequent MRA, performed after the original catheter was removed and a new line placed, revealed a prominent fibrin sheath extending along the vena cava from the previous insertion site, mimicking a retained catheter segment.
Key takeaways
This case demonstrates the imaging appearance of a fibrin sheath, a common complication around central venous catheters, which can simulate retained catheter fragments or other intravascular filling defects, necessitating careful evaluation.
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