I. Genetic Causes These are inherited or caused by genetic mutations, either present at birth or progressive over time. II. Acquired Causes These are due to factors after conception and can occur prenatally, perinatally, or postnatally. A. Prenatal (before birth) B. Perinatal (during birth) C. Postnatal (after birth) III. Unknown or Idiopathic Causes In some cases, no identifiable […]