Bilateral Rasmussen encephalitis.

Rasmussen encephalitis (RE) is a rare, chronic, inflammatory neurological disorder that usually affects one hemisphere of the brain. RE is characterized by frequent and severe seizures, progressive neurological dysfunction, and unilateral brain atrophy. This article documents a case of RE with bilateral involvement occurring at the age of 2. The patient's seizures consisted of focal motor seizures (epilepsia partialis continua in the fingers on the right hand); tonic convulsions of the right arm and head turning to the right with impairment of consciousness; and secondarily generalized tonic-clonic seizures. Antiepileptic drugs did not effectively control the seizures. The pathology of the left frontoparietal lobe biopsy of the abnormal MRI signal showed typical neuronal loss, abundant lymphocytic infiltration into the perivascular space, and numerous microglial nodules. Bipolar electrocoagulation on functional cortexes, which failed to alter the course of the illness, was followed by high-dose prednisone (about 2 weeks worth), without improvement. Both functional hemispherectomies and anatomical hemispherectomies failed to halt the course of the illness, and contralateral seizures developed and became apparent after the operation, suggesting bilateral RE.