Which clinical history findings are characteristic of spinal muscular atrophy (SMA) type IV - adult-onset form?

Updated: May 29, 2019
  • Author: Jeffrey Rosenfeld, MD, PhD, FAAN; Chief Editor: Stephen L Nelson, Jr, MD, PhD, FAACPDM, FAAN, FAAP  more...
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Onset is typically in the mid 30s.

In many ways, the disease mimics the symptoms of type III.

Overall, the course of the disease is benign, and patients have a normal life expectancy.

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