A longitudinal MRI study in children with Rasmussen syndrome

Area of Science:

• Neurology
• Neuroradiology
• Pediatric Neurology

Background:

• Rasmussen syndrome is a rare, chronic inflammatory neurological disease affecting one cerebral hemisphere.
• It typically presents in childhood with intractable epilepsy and progressive neurological deficits.
• Diagnosis often relies on clinical presentation and neuroimaging, but distinct patterns are not well-defined.

Purpose of the Study:

• To identify and characterize neuroimaging patterns of Rasmussen syndrome using serial magnetic resonance imaging (MRI).
• To explore potential correlations between observed MRI patterns and the syndrome's pathogenesis.

Main Methods:

• Prospective evaluation of brain MRIs in seven children with neuropathologically confirmed Rasmussen syndrome.
• Serial MRI scans (3-8 per patient) were acquired before and after the onset of epilepsia partialis continua.
• Correlation with neuropathologic findings and treatment outcomes (hemispherectomy, cortical resection) was assessed.

Main Results:

• The frontocentral region was the most common site of initial MRI signal abnormality.
• Three distinct patterns of MRI changes were observed: 1) progressive signal increase and atrophy, 2) initial focal increase followed by signal decrease, and 3) static signal increase.
• These patterns were observed in children with varying clinical courses and treatment responses.

Conclusions:

• Distinct neuroimaging patterns exist in Rasmussen syndrome, identifiable through serial MRI.
• These patterns may reflect different underlying pathogenetic mechanisms of the disease.
• Further research is warranted to elucidate the implications of these distinct MRI findings.