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The current American Joint Committee (AJCC) on Cancer TNM classification does not describe the treatment of multifocal papillary thyroid microcarcinomas (PTMCs) with a total tumour diameter (TTD) >1 cm. Herein, we investigated this PTMC subgroup in terms of extrathyroidal extension (ETE), local infiltration, central lymph node metastasis (LNM), and prognosis. Consecutive patients (n = 1102) were identified and the proportions of LNM, ETE, and local infiltration were similar between PTCs with a unifocal tumour diameter >1 cm and ≤2 cm and PTMCs with a multifocal TTD >1 cm and ≤2 cm. The proportions of LNM, ETE, and local infiltration were also similar between PTMCs with a unifocal diameter ≤1 cm  vs . multifocal TTD ≤1 cm. However, when comparing PTMCs with a unifocal diameter ≤1 cm  vs . multifocal TTD >1 cm, significant differences were observed. In the Kaplan-Meier analysis, significant differences were observed between PTMCs with a unifocal diameter ≤1 cm  vs . multifocal TTD >1 cm and multifocal TTD ≤1 cm  vs . multifocal TTD >1 cm. Accordingly, TTD may represent a more accurate criterion for tumour size of PTCs and should be considered in the revised AJCC staging system.

Total tumour diameter is superior to unifocal diameter as a predictor of papillary thyroid microcarcinoma prognosis