Fig. 9
From: Complications of central venous port systems: a pictorial review
a Twisting of port chamber (arrow) results in the inability to puncture the chamber. b, c Thrombosis of port chamber in another patient with increased flow resistance. Pre-contrast image shows the chamber, which only incompletely and marginally fills with contrast (small arrows). Note that the tube is completely opacified as proof of adequate injection (large error)