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In a normal case, the contrast flows straight out from the catheter.<ref name=Helsingborg/> Contrast flowing at a skewed angle compared to the catheter means a suspected fibrin sheath.<ref name=Helsingborg/>
A definite fibrin sheath is visualized as contrast flowing backwards around the catheter, looking like a thickening of the distal part, before exiting by at a more proximal part of the catheter.
==Report==
