Functional MRI in symptomatic proliferative angiopathies.

Area of Science:

• Neurology
• Radiology
• Neuroimaging

Background:

• Cerebral arteriovenous malformations (AVMs) often manifest as medically refractory seizures.
• Understanding the neurophysiological underpinnings of AVMs is crucial for effective management.

Purpose of the Study:

• To investigate functional magnetic resonance imaging (fMRI) activation patterns in patients with cerebral arteriovenous malformations (AVMs).
• To correlate these patterns with clinical findings and seizure control.

Main Methods:

• Blood oxygen-level dependent (BOLD) fMRI was performed on seven patients with AVMs and language difficulties.
• Patients underwent verbal fluency and repetition tasks using box-car paradigms.
• fMRI maps were generated using cross-correlation coefficients and superimposed on anatomical brain scans.

Main Results:

• Five patients exhibited redistribution of ipsilateral and/or contralateral activation clusters around the AVM or in contralateral areas.
• One patient with a severe post-ictal deficit showed a total hemispheric contralateral activation cluster redistribution.
• These findings suggest altered functional brain organization in AVM patients.

Conclusions:

• Functional MRI reveals significant alterations in brain activation patterns in patients with cerebral arteriovenous malformations.
• Activation cluster redistribution may be a compensatory mechanism or a consequence of the AVM.
• fMRI offers insights into the neurobiology of AVMs and their associated neurological deficits.