An X-linked recessive form of muscular dystrophy, typically first becoming evident in adolescence as difficulty with gait or with pelvic girdle muscle strength. It is characterized pathologically by inadequate production of dystrophin and thus is similar to, but usually milder than, Duchenne muscular dystrophy.
There exists a distinct variant of muscular dystrophy that primarily impacts older boys and men, known for its comparatively milder progression when compared to Duchenne muscular dystrophy.