In patients with SMA type 3, there may be evidence of pseudohypertrophy, as seen in patients with SMA type 2. The disease is characterized by slowly progressive proximal weakness; going up and down stairs may be difficult. Bulbar dysfunction occurs late in the disease course, which tends to be slowly progressive.
Learn more about the clinical presentation of SMA type 3.
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Cite this: Stephen L. Nelson. Fast Five Quiz: Spinal Muscular Atrophy Clinical Presentation - Medscape - Feb 01, 2021.