IGLON5 and Apnea: In summary, since the publication of two cases of a novel, brainstem accentuated neuronal 3R and 4R tauopathy associated with IgLON5 autoantibodies in patients with apnea and NREM parasomnia, a new case has been confirmed in Austria and three additional cases, one from Slovenia and two from the UK have been retrospectively identified on the basis of their nearly identical neuropathological phenotype.