has subject area Adolescent Adult Carcinoma, Medullary Carcinoma, Neuroendocrine Child Child, Preschool Female Humans Male Multiple Endocrine Neoplasia Type 2a Mutation Neoplasm Recurrence, Local Proto-Oncogene Mas Proto-Oncogene Proteins c-ret Thyroglobulin Thyroid Neoplasms Thyroidectomy Thyrotropin