Neuropathy, Hereditary Sensory and Autonomic, Type Ix, with Developmental Delay, also known as hsan9, is related to hereditary spastic paraplegia 49 and hereditary sensory and autonomic neuropathy due to tecpr2 mutation. An important gene associated with Neuropathy, Hereditary Sensory and Autonomic, Type Ix, with Developmental Delay is TECPR2 (Tectonin Beta-Propeller Repeat Containing 2). Affiliated tissues include brain and lung, and related phenotypes are intellectual disability and short neck