Facial pruritus and stiffness as the initial manifestations of glycine receptor antibody-positive progressive encephalomyelitis with rigidity and myoclonus: a case report and literature review
Progressive encephalomyelitis with rigidity and myoclonus (PERM) is a rare and severe phenotype within stiff-person spectrum disorders (SPSD), frequently associated with glycine receptor antibodies (GlyR-Ab). Because typical rigidity and stimulus-sensi…