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Updated: Feb 8, 2026

Repetitive Transcranial Magnetic Stimulation to the Unilateral Hemisphere of Rat Brain
Published on: October 22, 2016
Plastic in the Brain: Delayed Recognition of Progressive Unilateral Hemispheric Lesions
Ali Daneshmand1, Karl N Krecke1, Eelco F M Wijdicks2
1Division of Critical Care Neurology and Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
Background:
Flow diverters are increasingly used to treat complex ruptured intracranial aneurysms. Most complications are ischemic and seen early after placement.
Methods:
We present a patient with 3 year duration of neurologic symptoms and seizures as a result of lesions associated with a inflammatory response to embolized polymer coating.
Results:
Over a period of 3 years MRI abnormalities were noted with substantial gadolinium enhancement of the stent but with resolution after corticosteroids.
Conclusion:
Polymer embolization associated with a flow diverter may cause fluctuating unilateral hemisheric lesions and become symptomatic. Inflammatory response to a foreign body (polymer strands) can be succesfully treated with corticosteroids.
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