Among patients whose biopsy was indicative a congenital myopathy, 10 received a genetic diagnosis with identification of pathogenic mutations in the following genes: MTM1 (three cases), RYR1 (one case), ACTA1 (one case), TNNT1 (one case), TPM3 (one case), TTN (one case), CFL2 (one case), and DNM (one case). This evidence concerns the gene DNM1 and congenital myopathy with cores.