Risks: Thermal, Displacement
- Assumed to be ferromagnetic, and considered unsafe if located within 5mm of a solid organ or of a 3rd order or more proximal arterial/venous branch of the aorta/IVC.
- Take precautions to limit and monitor for symptoms of thermal injury.
- Embedded metallic foreign bodies, especially if in place for a long period of time, may be anchored in place by scar tissue. Use clinical judgment in assessing the potential risks and benefits of undergoing MRI.
- Shrapnel located at or distal to the elbow or knee meet the above criteria and do not require further evaluation or clearance.
Bottom line: Requires radiologist determination on case by case basis