"Rasmussen syndrome: A brain disorder caused by inflammation of brain cells in one hemisphere. Its cause is unknown. Rasmussen syndrome causes seizures often difficult or impossible to control with medication, and eventually results in brain shrinkage (atrophy). Treatment is with surgery, if possible. The inflammation seems to stop of its own accord eventually, but the damage done is irreversible.
It is also called Rasmussen encephalitis. There are frequent and severe seizures (convulsions), progressive loss of motor skills and speech, hemiparesis (paralysis on one side of the body), encephalitis (inflammation of the brain), dementia, and mental deterioration. The disorder affects a single brain hemisphere (one side or the other of the brain but not both sides) and generally occurs in children under the age of 15."
(Quote taken from URL listed below.)
Have you read, "DPT: A Shot in the Dark"? There's info there as well.