Most common preventable cause of mental retardation:-
- Congenital hypothyroidism is the M.C preventable cause of mental retardation - In India incidence is 1:1000 - Most common cause of congenital hypothyroidism is thyroid dysgenesis. - Most common cause of congenital hypothyroidism with goitre- Thyroid dyshormonogenesis.
Down's syndrome
Congenital hypothyroidism
Rett's syndrome
Fragile x syndrome
Thyroid disorders