Benign X-linked muscular dystrophy (Becker type): a kindred with very slow rate of progression.

A family with benign X-linked muscular dystrophy (Becker type) has been studied. There was a total of 8 affected males, 7 of whom were alive. The clinical and pathological features are presented. The clinical symptoms started in the 2nd decade for most of the patients. The rate of progression was very slow and 3 patients became confined to a wheelchair in the second half of the 6th decade.