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Up to: Proximal spinal muscular atrophy
Spinal muscular atrophy, type II
Proximal spinal muscular atrophy type 2 (SMA2) is a chronic infantile 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.
This condition has no sub-types.