IGLON5 and glycogen storage disease VI: Gaig et al. summarized the most frequent clinical “phenotype mimics” observed so far in anti-IgLON5 disease into progressive supranuclear palsy (PSP) -like, multiple system atrophy-like, acute/subacute encephalitic-like, Huntington’s disease-like, and motor neuron disease-like [17, 18, 21].