Postictal cortical restricted diffusion and edema
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Gyral high DWI signal and high T2 signal on the left, in the setting of protracted seizure activity probably represents post-ictal change.
It is difficult to be certain that this merely represents postictal change, although this is most likely the case. Alternative diagnoses include encephalitis or even subacute ischemia. Demonstrating rapid resolution confirms the diagnosis (not available in this case).