Neuropathy, Hereditary Sensory and Autonomic, Type Iib, also known as hsan2b, is related to neuropathy, hereditary sensory and autonomic, type iia and autonomic neuropathy. An important gene associated with Neuropathy, Hereditary Sensory and Autonomic, Type Iib is RETREG1 (Reticulophagy Regulator 1). Affiliated tissues include peripheral nerve, and related phenotypes are osteolytic defects of the phalanges of the hand and spasticity