Value of the Combination Ultrasonography With Ti-RADS Score / Dual Tracer Scintigraphy MIBI-Tc99m/Iodine-123 in the Detection of Malignancy of Thyroid Nodules (≥15 mm) Classified Bethesda III or IV on Cytology

Inclusion Criteria: * Any patient over 18 years with a thyroid nodule ≥15 mm (maximal diameter measured on US) with a Bethesda class III or IV (FNA less than 6 months before the surgery). * Given signed, written informed consent * Affiliation to a social security system. * Neither-pregnant nor breast-feeding women. * Use of efficient contraception for patient with pregnancy potential (if needed). Exclusion Criteria: * Underage and adults under guardianship. * Pregnant, without efficient contraception (if needed) or breast feeding women. * Administration of iodinated contrast in the previous 3 weeks. * Contraindication to scintigraphy or to Iodine123/ MIBI 99Tc administration * Treatment containing iodine (i.e. : Amiodarone) * Hypo or hyperthyroidism treated or not. * Nodules inferior 15 mm. * Refusal to sign the consent. * Refusal of surgical treatment or contraindication for surgery or anesthesia * Morbid obesity (BMI Superior 40 kg/m2). * Hyperparathyroidism. * History of cervicotomy.