| Phenotype details |
progressive lower limb weakness; delayed walking (HP:0031936); no loss ambulation (-HP:0002505); gastrocnemius hypertrophy; tendon contractures (HP:0001771); no myalgia (-HP:0003326), no muscle spasm (-HP:0003394); creatine kinase 58340 IU/l; echocardiology normal; muscle biopsy biceps brachii dystrophic |