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Here's a snippet of an interesting news story:
Advances in Brain Imaging for EpilepsyBoth PET and magnetic resonance imaging (MRI) are under investigation as tools to guide neurosurgeons to areas of the brain where epileptic seizures originate.
Theodore and colleagues at NINDS have found, in their pilot study, that a marker for serotonin systems was able to identify epilepsy-generating brain areas even in a patient with a normal MRI.
In related studies, the researchers have found that these deficits in serotonin correlate with the likelihood that patients with epilepsy will also suffer from depression.