|facioscapulohumeral muscular dystrophy||
Muscular dystrophy (MD) is a genetic (inherited) condition that gradually causes the muscles to weaken. Facioscapulohumeral MD affects the muscles in the face (facio), shoulders (scapula) and upper arm (humeral). This can affect both sexes. Symptoms start between 10-40 years of age and progress slowly.
Definition from NHS Choices: facioscapulohumeral muscular dystrophy