Tongue fasciculations are pathognomonic for all types of SMA and occur in 56% of patients. This symptom is not present in any other neuromuscular disorder of infants.
Patients with SMA tend to have above-average intelligence, and they do not exhibit central nervous system abnormalities, such as seizures.
For more on pathognomonic abnormalities of SMA, read here.
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Cite this: Stephen L. Nelson. Fast Five Quiz: Can You Diagnose the Different Types of Spinal Muscular Atrophy? - Medscape - Dec 06, 2018.