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Abstract
The syndrome of chronic encephalitis with epilepsy (Rasmussen's syndrome) typically occurs in children and is characterized by the development of intractable focal seizures, progressive hemiparesis and intellectual deterioration. The etiology is unknown, and the pathological abnormalities vary from those of active disease, with numerous microglial nodules, with or without neuronophagia, perivascular round cells and glial scarring, to those of remote disease, demonstrated by neuronal loss, gliosis and perivascular round cells but few microglial nodules. We describe five patients presenting with clinical features typical of Rasmussen's syndrome, in whom pathological examination showed a second, previously unsuspected pathology in addition to the changes of chronic encephalitis. Two of the patients had vascular abnormalities bearing some resemblance to cavernous angiomata, one had a tumor, one had tuberous sclerosis, and one the forme fruste of tuberous sclerosis. The coexistence of a second pathology in these patients may provide information about the underlying mechanism of this rare condition.
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