Most common cause of congenital hypothyroidism: (Repeat): (A) Thyroid dysgenesis, (B) Maternal antibodies, (C) Inborn errors of thyroid hormone defects, (D) Maternal iodine deficiency
Answer is A. Ans: A (Thyroid dysgenesis) Ref: Nelsons Textbook of Pediatrics. 19th Edition. Pg.1895Explanation:"Most cases of congenital hypothyroidism results from thyroid dysgenesis "(Ref: Nelson)Refer 2013 Pediatrics Question Explanation