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Spinal muscular atrophy, type IV
rareProximal spinal muscular atrophy type 4 (SMA4) is the adult-onset form of proximal spinal muscular atrophy characterized by muscle weakness and hypotonia resulting from the degeneration and loss of the lower motor neurons in the spinal cord and the brain stem nuclei.
- Identifiers
- MONDO:0010056 OMIM:271150Orphanet:83420
- Causal genes
- SMN1
- Part of
- Proximal spinal muscular atrophy
- Also known as
- adult-onset spinal muscular atrophy · SMA 4 · SMA type 4 · SMA type IV · SMA-IV
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