The relationship between post-traumatic stress disorder (PTSD) and focal epilepsy is poorly understood. It has been hypothesized that there is a complex and reciprocal potential reinforcement of the symptoms of each condition. In this study, we investigated whether there were PTSD-specific brain changes in temporal lobe epilepsy (TLE). Brain 18F-FDG-PET metabolism was compared between controls and two groups of TLE patients: one group of 15 patients fulfilling the criteria of a potential diagnosis of PTSD (TLE-PTSD+), another group of 24 patients without a diagnosis of PTSD (TLE-PTSD-) and a group of 30 healthy control participants. We compared the differences in brain PET metabolism among these 3 groups and we studied their correlations with interictal and peri-ictal scales of PTSD symptoms. TLE-PTSD+ patients showed more significant hypometabolism involving right temporal and right orbito-frontal cortex in comparison to TLE-PTSD- patients and healthy subjects. Moreover, degree of reduced metabolism in these brain areas correlated with interictal and peri-ictal PTSD questionnaire scores. PTSD in temporal epilepsy is associated with specific changes in neural networks, affecting limbic and paralimbic structures. This illustrates the close intertwining of epileptogenesis and psychogenesis processes in these patients.
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