We expected to identify a higher number of such patients based on Parboosingh et al. 19 findings showing 2% misdiagnoses in amyotrophic lateral sclerosis patients and Ibañez et al.,7 who found that 3.7% of patients diagnosed with amyotrophic lateral sclerosis carried pathogenic repeat expansions in AR. This evidence concerns the gene AR and amyotrophic lateral sclerosis.