Dysphagia in hereditary sensory autonomic neuropathy type IV.

There has been tremendous progress in the detection and diagnosis of hereditary neuropathies and while the genes responsible for these rare neuropathies have improved our understanding of the development of the sensory system, they remain clinical enigmas with rare occurrences and diverse presentations. In 1963, Swanson first described two brothers with congenital insensitivity to pain, anhidrosis and mild mental retardation. Several different types of hereditary sensory autonomic neuropathies (HSAN) have been delineated since then.