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===Choice of modality===
Fibrin sheaths are usually detected by fluoroscopic catheter contrast angiography.<ref name="KnutstadHager2016">{{cite journal|last1=Knutstad|first1=K.|last2=Hager|first2=B.|last3=Hauser|first3=M.|title=Radiologic diagnosis and management of complications related to central venous access|journal=Acta Radiologica|volume=44|issue=5|year=2016|pages=508–516|issn=0284-1851|doi=10.1080/j.1600-0455.2003.00115.x}}</ref>
*'''[[X-ray of central venous catheters]]''' is enough to check position after insertion, or in suspected movement.
A suspicion of a thrombotic occlusion of the vein passed by the catheter indicates a [[CT angiography]].<ref name=Helsingborg/>
