Fast Five Quiz: Spinal Muscular Atrophy Clinical Presentation

Stephen L. Nelson, Jr, MD, PhD


February 01, 2021

The presentation and clinical findings in patients with SMA type 4 are similar to those seen in patients with SMA type 3; however, the overall degree of motor weakness is less severe in patients with type 4 SMA than in type 3 SMA. Disease onset typically occurs in patients in their mid-30s. The disease course is generally mild and slow, and patients can be expected to have a normal life expectancy.

Learn more about the clinical presentation of SMA type 4.


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