Which type of catheter is NOT part of the listed types?

The correct answer is identified as Flexwire, as it is not classified as a typical catheter type in interventional radiology.

Berenstein, Mikaelsson, and SOS Omni are recognized catheter types used for various purposes in interventional procedures. The Berenstein catheter is known for its ability to navigate complex vascular anatomy due to its shape and flexibility; it is often used in neurovascular interventions. The Mikaelsson catheter is a specialized tool, typically employed in the context of cardiovascular interventions, allowing for accurate access to vessels. The SOS Omni is a multi-purpose catheter that offers various functionalities, including the ability to perform selective angiocardiography.

In contrast, Flexwire is often associated with a different context, such as guidewires or other devices used in conjunction with catheters rather than being classified directly as a catheter itself. It lacks the specific characteristics and uses that define the other listed catheters, placing it outside the standard types used in interventional radiology practice.