Radiology Question for the Week of June 24, 2019


What is the difference between exchange and conversion for biliary drainage?


An exchange refers to changing out the existing catheter for the same type of device or switching an existing internal-external catheter to an external catheter. A conversion refers to switching an existing external catheter to an internal-external catheter. If either of these types of existing catheters are switched for a completely internal drainage device, this is neither an exchange or a conversion; this is a stent placement through an existing access.

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