Fig 7.

A 41-year-old man with apparent thrombosis of the entire right internal jugular vein (IJV). A, Coronal reformatted MIP image from CTA shows nonopacification of the entire visualized right internal jugular vein (IJV, arrows) compared with the opacified left IJV (arrowheads). B, Axial source CTA image again shows no contrast in the right IJV (arrow). C, Contrast-enhanced CT at the same level as B shows delayed contrast filling of the IJV (black arrow), suggesting sluggish flow but patency of the superior IJV at the skull base. More inferior portions of the IJV in the neck could not be assessed on contrast-enhanced CT, which images only the head, so it is unclear whether the remainder of the IJV was thrombosed or patent but with slow flow. No follow-up imaging was available in this patient, who had a right central venous catheter (not shown), which may have provided a nidus for thrombosis or impeded venous drainage causing slow flow.