A deformity, dysmorphism, or dysmorphic feature is a major abnormality in the shape of a body part or organ compared to the normal shape of that part.

===== Causes =====

Deformity may arise from numerous causes:

  * Genetic mutation
  * Damage to the fetus or uterus
  * Complications at birth
  * A growth or hormone disorder
  * Reconstructive surgery following a severe injury, e.g. burn injury
  * Arthritis and other rheumatoid disorders
  * Fractured bones left to heal without being properly set (malunion)
  * Chronic application of external forces, e.g. artificial cranial deformation
  * Chronic paresis, paralysis or muscle imbalance, especially in children, e.g. due to poliomyelitis or cerebral palsy