She developed muscle weakness of the distal part of the left lower extremity at age 42, followed by muscle weakness and atrophy of the right lower extremity and upper extremities
[ncbi.nlm.nih.gov]
Signs and symptoms include muscle weakness, atrophy, and fasciculation Group of disorders marked by progressive degeneration of motor neurons in the spinal cord resulting
[icd9data.com]
Without adequate nerve function, patients with SMA experience progressive muscle weakness and atrophy, impacting the ability to crawl, sit, or stand and eventually to breathe
[rdmag.com]