"New-onset refractory status epilepticus (NORSE) is defined as refractory status epilepticus occurring in a previously healthy patient with no known history of epilepsy, who has no identifiable structural, toxic or metabolic cause for their refractory status epilepticus found on initial investigation."
"There are no specific abnormalities on MRI brain except for perhaps mild T2/FLAIR hyperintense signal of the mesial temporal lobe 1. Bilateral lesions of the claustrum may also be present (claustrum sign), particularly in febrile infection-related epilepsy syndrome (FIRES)."