Duchenne Muscular Dystrophy

Onset: Early childhood - about 2 to 6 years.
Symptoms: Generalized weakness and muscle wasting affecting limb and trunk muscles first. Calves often enlarged.
Progression: Disease progresses slowly but will affect all voluntary muscles. Survival rare beyond late twenties.
Inheritance: X-linked recessive. This means only males are affected but females may be a carriers and transmit the disease

Other Types of Muscular Dystrophy

Becker Muscular Dystrophy
Limb-Girdle Muscular Dystrophy
Myotonic Dystrophy
Congenital Muscular Dystrophy
Infantile Progressive Spinal Muscular Atrophy (Also known as SMA Type 1, Werdnig-Hoffman)
Juvenile Spinal Muscular Atrophy  (Also known as SMA Type 3, Kugelberg-Welander)   
Spinal Bulbar Muscular Atrophy (SBMA) (Also known as Kennedy's Disease and X-Linked SBMA)   
Adult Spinal Muscular Atrophy (SMA)