Evolving Cognitive Dysfunction in Children with Neurologically Stable Opsoclonus-Myoclonus Syndrome

Area of Science:

• Pediatric Neurology
• Neurodevelopmental Disorders
• Immunology

Background:

• Opsoclonus-myoclonus syndrome (OMS) is linked to cognitive deficits, typically in severe or relapsing cases.
• Limited data exists on cognitive dysfunction in children with stable neurological disease course in OMS.

Purpose of the Study:

• To investigate evolving cognitive dysfunction in children with OMS experiencing a mild disease course.
• To assess long-term cognitive outcomes in children with OMS after treatment completion and neurological recovery.

Main Methods:

• Case series of three children with OMS, aged 17-35 months at onset.
• Follow-up duration of 4-10 years, including immunotherapy and monitoring for relapses.
• Assessment of cognitive function during remission and stable neurological status off treatment.

Main Results:

• All three children achieved remission within 7 months with immunotherapy.
• Two children experienced one clinical relapse, responding again to immunotherapy.
• Evolving cognitive dysfunction was observed in all cases despite remission and stable neurological condition for a median of 20 months.

Conclusions:

• Cognitive dysfunction can evolve in children with OMS even with a mild disease course and after achieving remission.
• Long-term learning and cognitive development outcomes require continued concern for children with OMS post-treatment, irrespective of initial neurological recovery.