Active Surveillance Versus Surgery in Thyroid Papillary Microcarcinoma

Inclusion Criteria: * Age \>or =18 * Suspicious nodule \< or = or 13 mm in the maximum size of thyroid ultrasound (not older than 3 months after the screening visit) * Cytology consistent with the TIR4 or TIR 5 class * Sieric TSH in th standard range (with or without levo-tyroxin therapy) * Normal string motility to fibrolaringoscopy * Written informed consent Exclusion Criteria: * Ultrasound evidence of suspicious lump located on the posterior side of the lobe close to neurogene structures * Calcitonin increase above normal levels * Clinical or instrumental evidence of locoregional lymph node metastases (central or laterocervical compartment) or remote * any Contraindications to surgery