Congenital muscular dystrophy (CMD) refers to a group of muscular dystrophies that show themselves at or near birth. Muscular dystrophies in general are genetic, degenerative diseases primarily affecting voluntary muscles.
Types of CMD include merosin-deficient, Ullrich, Bethlem myopathy, integrin-deficient, Fukuyama, muscle-eye-brain disease (MEB), Walker-Warburg syndrome and CMD with rigid spine syndrome.
For more on these, see Types of CMD.
CMD results in overall muscle weakness with possible joint stiffness or looseness. Depending on the type, CMD may involve spinal curvature, respiratory insufficiency, mental retardation or learning disabilities, eye defects or seizures. For more, see Types of CMD and Signs and Symptoms.
CMD is caused by genetic mutations affecting some of the proteins necessary for muscles and sometimes for the eyes and or brain. See Causes/Inheritance.
CMD has its onset at or near birth, and progression varies with type. Many types are slowly progressive; some shorten life span.
Researchers have identified many of the genes that, when defective, cause various forms of CMD. These discoveries have led to greater understanding of these diseases and advances in diagnosis and treatment strategies. For more, see Research.