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While about one-half of patients with migraine with aura have a patent foramen ovale, their right-to-left cardiac shunt does not increase the risk of white matter lesions on MRI scan of the brain.

Do White Matter Brain Lesions Indicate Cardiac Shunt in a Migraineur?

While about one-half of patients with migraine with aura have a patent foramen ovale, their right-to-left cardiac shunt does not increase the risk of white matter lesions on MRI scan of the brain.