FLVCR1 variants have predominantly been reported in cases of autosomal-recessive posterior column ataxia with retinitis pigmentosa (PCARP).24 Since the first description of FLVCR1 variants as cause of HSAN, only a few pathogenic variants have been reported, including missense and loss-of-function variants.25–27 The findings in this study based on six additional patients show that the clinical transitions between PCARP and HSAN are fluid and often result in a complex phenotype with overlapping symptoms. The gene discussed is FLVCR1; the disease is retinitis pigmentosa.