Choi JB, et al. - Authors evaluated the correlation between the extent of thyroidectomy and oncologic outcomes in patients with 1-cm to 4-cm differentiated thyroid cancer (DTC). A total of 16,057 patients with DTC underwent thyroidectomy at Yonsei University Hospital from April 1978 to December 2011. Nonetheless, DSS is not affected by the extent of thyroidectomy, benefits of total thyroidectomy are noted for reducing recurrence in patients with 1-cm to 4-cm DTC. However, extent of thyroidectomy does not affect oncologic outcome and lobectomy may be sufficient if such tumors have such low-risk features as being unifocal, intrathyroidal, and lymph node metastasis-negative.