The most common muscular dystrophy diagnosed in children is Duchenne muscular dystrophy (DMD, MIM #310200), an X-linked disorder caused by pathogenic variants in the DMD gene, with a prevalence of 19 per 100,000 live male births in Sweden.3 Variants in the DMD gene leading to partially functional protein result in a milder disease phenotype known as Becker muscular dystrophy4 (BMD, MIM #300376). Here, DMD is linked to muscular dystrophy.