[Quadriceps myopathy as dystrophin-associated myopathy].

Duchenne and Becker muscular dystrophy are both caused by a deletion in the dystrophin gene. In the past few years, many reports of atypical myopathies have been published where an association with a deletion within the same gene was found. We report one sporadic and one familial case of myopathy where we were able to demonstrate a deletion of the dystrophin locus using DNA analysis.