Whether someone with an aneurysm clip can safely undergo an MRI depends primarily on the type, material, and model of the aneurysm clip. Some modern aneurysm clips are designed to be MRI safe or MRI conditional, while certain older clips can pose serious risks in an MRI scanner.
An aneurysm clip is a small surgical device placed around the neck of a brain aneurysm to prevent blood from entering the weakened blood vessel. Because MRI scanners use strong magnetic fields, the clip’s composition and design must be confirmed before an MRI is performed.
Why Does an Aneurysm Clip Matter During an MRI?
MRI uses a powerful magnetic field along with radiofrequency energy to produce detailed images. A metallic object inside the body can potentially interact with this magnetic field.
With an aneurysm clip, the main concern is whether the clip could move, rotate, heat up, or otherwise interact with the magnetic field. The potential risk depends on the clip’s material and specific design.
Modern clips are commonly manufactured from materials such as titanium or certain non-ferromagnetic alloys. Many of these clips have been tested under specific MRI conditions.
However, not every aneurysm clip has the same MRI compatibility.
Are Modern Aneurysm Clips Safe for MRI?
Many modern aneurysm clips are MRI conditional, meaning they can be scanned safely under specified conditions. These conditions may include the MRI scanner’s magnetic field strength, specific operating limits, and other technical requirements.
MRI compatibility should never be determined simply by looking at the clip or assuming that all titanium clips are safe. The exact clip model and manufacturer information are important.
If the clip’s documentation confirms that it is MRI conditional, the MRI facility can determine whether the planned scan meets the required conditions.
What About Older Aneurysm Clips?
Older aneurysm clips require particular caution.
Some older clips were made from ferromagnetic materials that can interact strongly with an MRI’s magnetic field. In rare circumstances, a ferromagnetic aneurysm clip could potentially experience significant force or torque.
For this reason, people who had aneurysm surgery many years ago should not assume that their clip is safe for MRI simply because other patients with aneurysm clips can have MRI scans.
If the clip type cannot be identified, the MRI facility may need additional information before deciding whether scanning is appropriate.
How Can You Find Out if Your Aneurysm Clip Is MRI Compatible?
The safest approach is to obtain documentation identifying the clip.
Useful information may include:
- Manufacturer and model
- Implant date
- Surgical records
- Implant card
- Operative report
- Hospital records
- Medical imaging or previous MRI documentation
The operative report can be particularly useful because it may identify the exact clip that was implanted.
A radiologist, neurosurgeon, MRI technologist, or other qualified medical professional can then review the information and determine whether the clip is suitable for MRI.
Can an X-Ray Identify an Aneurysm Clip?
An X-ray or CT scan can show the presence and general appearance of an aneurysm clip, but identifying MRI compatibility from an image alone may not always be possible.
If the medical records are unavailable, healthcare professionals may use available imaging and other historical information to help identify the clip. However, the decision should be made according to appropriate MRI safety procedures rather than relying on visual appearance alone.
What Should You Tell the MRI Facility?
Always tell the MRI facility that you have an aneurysm clip before entering the MRI scanner room.
Provide as much information as possible about the implant, including when and where the aneurysm surgery was performed.
You should also mention any other implanted medical devices or metallic objects you may have.
The MRI team can then review the implant information and determine whether the scan can be performed safely and under what conditions.
What If You Don’t Know Which Clip You Have?
This is an important situation. If you don’t know the clip’s manufacturer or model, do not assume that the clip is MRI safe.
Contact the hospital or surgeon who performed the original aneurysm surgery and ask whether they can provide the operative or implant records.
If those records cannot be obtained, discuss the situation with the doctor who ordered the MRI and the MRI facility. They may need to investigate further before proceeding.
The safest decision depends on the available evidence about the implanted clip.
Does the MRI Strength Matter?
Yes. MRI scanners can operate at different magnetic field strengths, commonly expressed in tesla (T).
An implant may be considered MRI conditional under particular scanner conditions but not necessarily under every MRI configuration. Therefore, knowing that an aneurysm clip has been described as “MRI safe” is not always enough; the specific manufacturer’s MRI conditions should be checked.
The MRI team should follow the manufacturer’s documented conditions for the exact implant.
What If an MRI Is Medically Necessary?
If an MRI is needed to diagnose or monitor a medical problem, the presence of an aneurysm clip does not automatically mean that MRI is impossible.
Instead, healthcare professionals generally need to establish:
- What type of clip was implanted.
- Whether its MRI status is known.
- Which MRI conditions are permitted.
- Whether the planned MRI meets those conditions.
- Whether another imaging test would be more appropriate if compatibility cannot be established.
Depending on the situation, alternatives such as CT or CT angiography may sometimes be considered, but the appropriate test depends on the medical question.
Can Someone With an Aneurysm Clip Have an MRI After Surgery?
The answer depends on the clip and the circumstances. The fact that someone has recovered from aneurysm surgery does not by itself determine MRI compatibility.
A person may be able to have an MRI after aneurysm clipping if the implanted clip has been identified and is documented as compatible under the conditions of the planned examination.
The important point is not simply how long ago the surgery occurred, but what device was implanted and what its MRI safety information says.
Frequently Asked Questions
Can all aneurysm clips go into an MRI?
No. MRI compatibility varies between clip models and materials. Some are MRI conditional, while certain older clips may present significant risks.
Is a titanium aneurysm clip safe for MRI?
Many titanium aneurysm clips have favorable MRI safety characteristics, but you should still verify the exact manufacturer and model. Do not rely on the word “titanium” alone.
What happens if the clip’s MRI status is unknown?
The MRI should generally not proceed until qualified professionals have enough information to assess the implant’s safety. Medical records, implant documentation, and previous imaging may help.
Can I have a CT scan instead of an MRI?
Sometimes. CT and other imaging methods may provide useful alternatives depending on what the doctor needs to evaluate. Your healthcare provider can determine which examination is most appropriate.
Should I tell the MRI technician about my aneurysm clip?
Yes. Always disclose an aneurysm clip before an MRI examination and provide any available implant documentation.
Conclusion
Can someone with an aneurysm clip have an MRI? In many cases, yes—but it depends on the specific aneurysm clip and the MRI conditions.
Modern aneurysm clips are often designed to be MRI conditional, whereas some older clips may be unsafe. Before an MRI, the exact implant should be identified whenever possible, and its MRI safety information should be reviewed by the appropriate medical and MRI professionals.
If you have an aneurysm clip and have been referred for an MRI, do not make the safety decision yourself. Contact the MRI facility and provide your surgical or implant records so the team can determine the safest approach.
