Becker Muscular Dystrophy Definition

A variant of Duchenne's muscular dystrophy in which symptoms of muscle weakness are milder, progress at a slower and less predictable rate, and do not appear until late childhood or early adulthood.

A form of muscular dystrophy that begins in late childhood or adolescence, almost exclusively affects males, and is characterized by progressive weakening of the muscles that is similar to but less severe than in Duchenne muscular dystrophy. It is caused by a recessive genetic mutation on the X chromosome that results in insufficiency or abnormality of the protein dystrophin in muscle cells.