Abstract
The clinical and histological features of two Negro brothers with a centronuclear myopathy are described. They bring to 19 the number of cases now reported with this constellation of physical signs and pathological changes in the muscles. A review of these patients suggests the existence of several different diseases causing this picture, though presumably the underlying biochemical defects are closely related. It is concluded that these myopathies are degenerative rather than due to arrest of foetal muscle maturation.
