Case report: Atypical anti-GlyR antibody-positive pediatric progressive encephalomyelitis with rigidity and myoclonus presenting as chronic joint pain.
Progressive encephalomyelitis with rigidity and myoclonus (PERM) represents the most severe subtype of stiff-person spectrum disorders and is exceedingly rare in children. We report a 14-year-old female patient who presented with chronic joint pain and axial rigidity as the initial manifestations, with a disease course...