Hereditary sensory and autonomic neuropathy type 3 (HSAN3), also known as familial dysautonomia or Riley Day syndrome, is an rare hereditary autosomal recessive anomaly characterized by impairment of sensory and sympathetic innervation. The prevalence is 1:10,000 to 1:20,000 Ashkenazi Jews newborns. This condition is considered a rare condition among non-Jewish children 1-3 .
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