spinal muscular atrophy, type II

spi·nal mus·cu·lar at·rophy, type II

(spī'năl mŭs'kyū-lăr at'rŏ-fē tīp)
A form intermediate in severity between the infantile form (SMA type I) and the juvenile form (SMA type III); characterized by proximal muscle weakness with onset usually between 3-15 months and survival until adolescence; autosomal recessive inheritance, caused by mutation in the SMN1 gene on 5q.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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