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Congenital myopathy with myasthenic-like onset is a rare, genetic, non-dystrophic myopathy characterized by fatigable muscle weakness associated with congenital myopathy. Patients present with axial hypotonia, myopathic facies with fatigable ptosis, feeding difficulties, delayed gross motor development and proximal limb weakness with a RYR1-related typical pattern of muscle involvement (i.e. severe involvement of the soleus muscle and sparring of the rectus femoris, sartorius, gracilis and semitendinous muscles). Scoliosis and frequent respiratory tract infections are additional observed features.
Biomarker and diagnostic research for congenital myopathy with myasthenic-like onset has been reported in the published literature.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for congenital myopathy with myasthenic-like onset.
4 publications have been identified in PubMed for congenital myopathy with myasthenic-like onset. Research spans Case Report / Case Series (75%) and Diagnostic / Biomarker (25%).
Jose A (2026). [PMID: 41999517](https://pubmed.ncbi.nlm.nih.gov/41999517/). *Neurogenetics*. [Case Report / Case Series]
Finsterer J (2025). [PMID: 40330390](https://pubmed.ncbi.nlm.nih.gov/40330390/). *Cureus*. [Case Report / Case Series]
Kulsirichawaroj P (2025). [PMID: 40494860](https://pubmed.ncbi.nlm.nih.gov/40494860/). *Pediatric research*. [Diagnostic / Biomarker]
Lail G (2024). [PMID: 38484275](https://pubmed.ncbi.nlm.nih.gov/38484275/). *Neurology*. [Case Report / Case Series]
Data assembled from 3 of 12 sources · Last updated Sep 20, 2026, 12:34 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center