Conservative Surveillance Management of Low-Risk Papillary Thyroid Microcarcinoma.

Most low-risk papillary thyroid microcarcinomas are indolent. Ten years of active surveillance at Kuma Hospital revealed that only 8.0% of patients showed enlargement of 3 mm or greater, whereas only 3.8% showed nodal metastasis. None, including those who underwent rescue surgery after the detection of progression, showed life-threatening recurrence or distant metastasis, and none died of thyroid carcinoma. Adverse events were significantly more frequent in patients who underwent immediate surgery than in those who had active surveillance. Medical costs were significantly higher. Therefore, active surveillance ought to be the primary method of low-risk papillary thyroid microcarcinoma management.