Pediatric autoimmune Parkinsonism and response to deep brain stimulation.

INTRODUCTION Influenza virus has been associated with cases of Parkinsonism, yet a direct relationship has not been confirmed in the literature. Different mechanisms of post-infectious Parkinsonism have been proposed including inflammatory, oxidative stress, and autoimmune. We report a first to our knowledge case of pediatric autoimmune Parkinsonism with autoantibodies to dopamine D2L receptor (anti-DRD2L antibodies), who underwent deep brain stimulation (DBS) of bilateral globus pallidi (GPi). CASE REPORT A 13-year-old girl presented with Parkinsonism features after a severe case of influenza A. She underwent extensive work-up and was found to have elevated titers for anti-DRD2L antibodies. Patient was initially treated with IVIG and plasmapheresis with mild improvement, but her condition continued to worsen. She was responsive to levodopa; however, she developed severe dyskinesia. Patient underwent DBS implantation resulting in partial improvement in bradykinesia, tremors, and dyskinesia. CONCLUSION This case is meant to raise awareness of a rare potential autoimmune complication after influenza virus and to share the experience and outcome using DBS to palliate some of the symptoms.