Early onset Rasmussen's syndrome: a malignant, often bilateral form of the disorder

Area of Science:

• Neurology
• Pediatric Neurology
• Neuroimmunology

Background:

• Rasmussen's syndrome (RS) is a rare, chronic inflammatory neurological disease affecting the brain.
• Early-onset RS in children is increasingly recognized for its tendency towards bilateral cerebral hemisphere involvement.
• The prognosis of RS varies significantly based on age of onset and disease laterality.

Purpose of the Study:

• To describe a cohort of children with early-onset Rasmussen's syndrome and bilateral disease.
• To investigate the clinical characteristics and prognosis of pediatric bilateral RS.
• To compare the presentation and outcomes of bilateral RS in children versus adults.

Main Methods:

• Retrospective case series analysis of children diagnosed with Rasmussen's syndrome.
• Clinical data review including neurological examination, seizure patterns, and neuroimaging.
• Comparison with previously reported adult cases of Rasmussen's syndrome.

Main Results:

• A cluster of children with early-onset Rasmussen's syndrome exhibited a marked tendency for bilateral brain involvement.
• This pediatric bilateral form of the disease presented with a poor prognosis, often proving fatal.
• Bilateral involvement in adults, unlike bilateral epileptic discharges, appears to have a more favorable prognosis.

Conclusions:

• Early-onset Rasmussen's syndrome with bilateral involvement in children represents a distinct and severe clinical entity.
• Immune system immaturity may contribute to the aggressive bilateral progression in pediatric cases.
• Further research is needed to understand the impact of immunomodulatory treatments on contralateral spread in Rasmussen's syndrome.