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Distal hereditary motor neuronopathies (distal HMN, dHMN), sometimes also called distal hereditary motor neuropathies, are a genetically and clinically heterogeneous group of motor neuron diseases that result from genetic mutations in various genes and are characterized by degeneration and loss of motor neuron cells in the anterior horn of the spinal cord and subsequent muscle atrophy.
Distal hereditary motor neuropathy type V is a particular type of neuropathic disorder. In general, distal hereditary motor neuropathies affect the axons of distal motor neurons and are characterized by progressive weakness and atrophy of muscles of the extremities. [ 1 ]
Patients with hereditary motor and sensory neuropathies are diagnosed through a physical evaluation that looks for muscle atrophy, weakness, and sensory responses. [3] In addition to this, electromyography and motor nerve conduction tests can help clinicians decide what type of motor and sensory neuropathy it is and how severe the disease is.
Distal spinal muscular atrophy type 2 (DSMA2), also known as Jerash type distal hereditary motor neuropathy (HMNJ), is a very rare childhood-onset genetic disorder characterised by progressive muscle wasting affecting lower and subsequently upper limbs.
Congenital distal spinal muscular atrophy (cDSMA), also known as distal hereditary motor neuropathy (or neuronopathy) type VIII (dHMN8), is a hereditary medical condition characterized by muscle wasting (), particularly of distal muscles in legs and hands, and by early-onset contractures (permanent shortening of a muscle or joint) of the hip, knee, and ankle.
Compression neuropathy; Congenital distal spinal muscular atrophy; Congenital facial diplegia; Color blindness; Cornelia de Lange syndrome; Corticobasal degeneration; Cotard delusion; Cranial arteritis; Craniosynostosis; Creutzfeldt–Jakob disease; Cumulative trauma disorders; Cushing's syndrome; Cyclic vomiting syndrome; Cyclothymic disorder
Hereditary motor and sensory neuropathy with proximal dominance (HMSN-P) is an autosomal dominant neurodegenerative disorder that is defined by extensive involuntary and spontaneous muscle contractions, asthenia, and atrophy with distal sensory involvement following. The disease starts presenting typically in the 40s and is succeeded by a slow ...
This condition was discovered in 1991 by Hahn et al., when they described two Chinese-Canadian siblings of the opposite sex. The male had difficulties releasing his grip, childhood-onset neuromyotonia and muscle stiffness, progressive motor neuropathy, finger cramping while and after writing, involuntary twitches of the finger, thigh and forearm muscles, foot drop-associated gait problems ...