Medullary thyroid carcinoma identified within the first year of life in children with hereditary multiple endocrine neoplasia type 2A (codon 634) and 2B.
Paediatric Endocrinology Department, Centre de Référence Maladies Endocriniennes Rares de la Croissance Paediatric Surgery Department Pathology, Assistance Publique-Hôpitaux de Paris, Robert Debré Hospital, 75019 Paris, France.