spinal muscular atrophy type III

spinal mus·cu·lar at·ro·phy type III

[MIM*253400]
the juvenile form, with onset in childhood or adolescence; characterized by progressive proximal muscular weakness and wasting, primarily in the pelvic girdle, followed by distal muscle involvement; caused by degeneration of motor neurons in the anterior horns of the spinal cord; autosomal recessive inheritance, caused by mutation in the SMN1 gene on 5q.
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