SPEG and cardiomyopathy: CNM with cardiomyopathy is linked to SPEG and DNM2 mutations, but, in many cases, the genetic cause is unknown (Agrawal et al., 2014; Al-Ruwaishid et al., 2003; Gal et al., 2015; Gospe et al., 1987; Verhiest et al., 1976).