Feasibility of active surveillance in patients with clinically T1b papillary thyroid carcinoma ≤1.5 cm in preoperative ultrasonography: MASTER study.

Additionally, the analysis of occult central LN metastasis between the cT1a and cT1b ≤1.5 groups revealed marginally nonsignificant results ( P = 0.024) in individuals aged 45 or older, as shown in Supplementary Table 2.

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