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Features include always present findings: Increased connective tissue and Neck flexor weakness; and very common findings: Scapular winging and Wrist drop. 18 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Muscles | 9 | Progressive muscle weakness, Achilles tendon contracture, Skeletal muscle atrophy |
Genetic testing for ACTA1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 2 always present features, 2 very common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for progressive scapulohumeroperoneal distal myopathy.
1 publication has been identified in PubMed for progressive scapulohumeroperoneal distal myopathy. Research spans Review / Meta-Analysis (100%).
Lee TM (2025). [PMID: 39922924](https://pubmed.ncbi.nlm.nih.gov/39922924/). *Pediatric research*. [Review / Meta-Analysis]
Data assembled from 7 of 12 sources · Last updated Sep 18, 2026, 11:03 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Bones and joints
4 |
Skeletal muscle atrophy, Centrally nucleated skeletal muscle fibers, Sideways curvature of the spine (scoliosis) |
Arms and legs | 2 | Hand muscle atrophy, Foot dorsiflexor weakness |
Brain and nerves | 1 | Hyporeflexia |
Head and neck | 1 | Facial palsy |