Which clinical history findings are characteristic of spinal muscular atrophy (SMA)?

Updated: Apr 28, 2014
  • Author: Hidehiro Takei, MD; Chief Editor: Adekunle M Adesina, MD, PhD  more...
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The clinical picture of spinal muscular atrophy (SMA) is highly variable and represents a continuum. The age of onset ranges from before birth to adulthood. The International SMA Consortium has defined 4 clinical types of SMA (I-IV) on the basis of the age of onset and achieved motor functions. [3]

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