has characteristic has characteristic Adult onset progressive muscular atrophy adult progressive spinal muscular atrophy, Aran Duchenne type https://rarediseases.info.nih.gov/diseases/9132/adult-progressive-spinal-muscular-atrophy-aran-duchenne-type A progressive muscle weakness and atrophy of the limbs that irregularly affects certain muscles, while it spares others. MONDO:0021824 adult progressive spinal muscular atrophy Aran Duchenne type adult SMA Aran Duchenne type Aran Duchenne spinal muscular atrophy