Which venous access was used to place the IVC filter?

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Placing an IVC filter relies on entering a vein that offers a straight, well-supported path to the inferior vena cava. The right iliac vein provides a direct route from the lower body into the IVC, giving stable catheter support and easier alignment for deploying the filter in the infrarenal portion of the IVC. This favorable angle helps position the filter correctly and reliably.

The other options involve less optimal angles or routes in this context: the left iliac route can be more tortuous at the iliac confluence, and a jugular (upper-body) approach, while used in some cases, can present a different angle and length that may complicate precise infrarenal placement.