Outcome after treatment of papillary thyroid microcarcinoma.

Patients with thyroid microcarcinoma (TMC) have favourable long-term prognoses. However, recurrences in the neck and distant metastases have been reported. The authors investigated independent factors associated with recurrence in an effort to define therapeutic guidelines. In this study they report the results of a retrospective review of patients followed at one Institution. 120 patients ( 96 females and 24 males; mean age 45.2 years) with a papillary thyroid microcarcinoma (PTC) < or =1 cm in greatest dimension were analyzed. All of them were followed for 5 to 15 years. 106 of them were managed aggressively (total thyroidectomy), the remainder treated with lobectomy alone. Radioiodine therapy was performed in 62/106 patients submitted to total thyroidectomy. Despite the different treatment and the presence of neck node metastases at the time of the diagnosis in 26 of the reported 120 patients (22%) and local invasion beyond the thyroid capsule in 20 (17%), only 1.7% of patients had neck nodal local recurrence. No patient died or developed distant metastases. In this preliminary study the authors conclude that the outcome of PMC is generally favourable, even in presence of lymph-node metastases and local invasion, independently of the primary treatment.