Which clinical history findings are characteristic of spinal muscular atrophy (SMA) type III (Kugelberg-Welander disease)?

Updated: Apr 28, 2014
  • Author: Hidehiro Takei, MD; Chief Editor: Adekunle M Adesina, MD, PhD  more...
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Type III SMA (Kugelberg-Welander disease)

Type III is a mild form of childhood and juvenile SMA. By definition, the disease onset is usually after the age of 18 months, but it may occur over a wide range, sometimes as late as the third decade of life. Patients gain the ability to walk without support. Spine deformities and contractures are frequent complications.

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