Main indications: -Exploration and monitoring of multinodular goiter -Functional characterization of the isolated thyroid nodule: hot nodule and cold nodule. -Estiological diagnosis of hyperthyroidism (Reference examination): *Graves' disease *Toxic adenoma Toxic or Basedowified multiheteronodular goiter *Hashitoxicosis - Exploration of congenital hypothyroidism and in adults.