Patients with intracranial aneurysm clips should be subjected to MRI with extreme caution, even musculoskeletal MRI of distant body locations. Titanium clips are MRI-safe. When exposed to a magnetic field, other cerebral aneurysm clips can deflect, causing catastrophic injury or death. When the product labeling specifies MRI compatibility, nontitanium clips made after 1995 are regarded safe.
For older clips, confirmation of ferromagnetic characteristics testing may be required. Never presume that a patient with an aneurysm clip who has previously undergone MRI may do so safely again variations in magnetic field characteristics and clip orientation in the field can cause the clip to react differently. Significant injuries, including blindness, have been documented.
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