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.