Inclusion Criteria:

- Age > or = 18 yrs

- With a toxic goiter or not, Graves' disease or thyroid nodule requiring a total
thyroidectomy

- Thyroidectomy under cervicotomy

- No echographic criteria to suspect a cancer: poorly defined nodules,
microcalcifications, cervical nodes

- Patient covered by social security

- Patient's informed and written consent

- Possible follow-up during 6 months

Exclusion Criteria:

- Minors and adults under guardianship

- Preoperatively known thyroid cancer by cytology

- Planned partial thyroidectomy

- Peri-operatively antiplatelet intake

- Preoperatively ENT examination (if performed) finding a vocal cords affection

- Diving goiter (> 3 cm below the sternal notch)

- Surgery using videoscopy

- Lack of possible monitoring during the 6 months after surgery

- History of anterior cervical surgery

- Pregnancy and breast-feeding

- hypercalcemia (calcemia> 2.6 mmol/l)