French to English Medical Medical (general)

Below is the entire sentence:

L’agression cérébrale post-traumatique détermine le plus souvent un syndrome d’hypertonie neuro-diencéphalique comparable à celui observe au cours de toutes les situations stressantes.

My best guess is "neuro-diencephalic hypertonia syndrome" but no hits on Google so any other ideas would be appreciated.

thanks!