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Adult-Onset Non-5q Proximal Spinal Muscular Atrophy: A Comprehensive Review
source: Arquivos de neuro-psiquiatria
authors: Pinto WBVR, Souza PVS, Badia BML, Farias IB, Albuquerque Filho JMV, Gonçalves EA, Machado RIL,Oliveira ASBsummary/abstract:
Background: Adult-onset spinal muscular atrophy (SMA) represents an expanding group of inherited neurodegenerative disorders in clinical practice.
Objective: This review aims to synthesize the main clinical, genetic, radiological, biochemical, and neurophysiological aspects related to the classical and recently described forms of proximal SMA.
Methods: The authors performed a non-systematic critical review summarizing adult-onset proximal SMA presentations.
Results: Previously limited to cases of SMN1-related SMA type 4 (adult form), this group has now more than 15 different clinical conditions that have in common the symmetrical and progressive compromise of lower motor neurons starting in adulthood or elderly stage. New clinical and genetic subtypes of adult-onset proximal SMA have been recognized and are currently target of wide neuroradiological, pathological, and genetic studies.
Conclusions: This new complex group of rare disorders typically present with lower motor neuron disease in association with other neurological or systemic signs of impairment, which are relatively specific and typical for each genetic subtype.organization: Universidade Federal de São Paulo, Departamento de Neurologia e Neurocirurgia, Setor de Investigações nas Doenças Neuromusculares, São Paulo SP, Brazil
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