CTICasesCalcified fibrin sheath embolus
Imaging findings
Chest CT shows a tubular, calcified, hollow structure within the left pulmonary artery. This developed after the removal of a central venous catheter, representing a calcified fibrin sheath that was stripped off during removal and embolized to the pulmonary vasculature.
Key takeaways
Fibrin sheaths form around indwelling catheters and can calcify over time. Upon catheter withdrawal, the calcified sheath can be stripped off, embolizing to the pulmonary arteries where it presents as a characteristic tubular, calcified intravascular structure mimicking a catheter fragment.
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