Peroneal muscular atrophy

A rare, inherited disorder characterized by muscle wasting in the feet and calves and then in the hands and forearms. The condition, also known as Charcot–Marie– Tooth disease, is caused by degeneration of some peripheral nerves. It is more common in boys, and usually appears in late childhood or adolescence. Muscle wasting stops halfway up the arms and legs, making them look like inverted bottles; sensation may be lost. There is no treatment, but the sufferer rarely becomes totally incapacitated because the disease usually progresses very slowly. Life expectancy is normal.