. 2021 Mar 12;13(6):1270. doi: 10.3390/cancers13061270

Table 1.

Numbers of thyroidectomies performed and the frequencies of pathological diagnoses in the periods indicated.

Period	Number of Thyroidectomies Performed	Pathological Criteria	Malignant Thyroid Tumor Classification			Non-Malignant Tumor	Graves’ Disease and Others
Period	Number of Thyroidectomies Performed	Pathological Criteria	PTC	FTC	Other	Non-Malignant Tumor	Graves’ Disease and Others
January 2015– December 2015	839	3rd WHO Classification	469	22	10	235	103
March 2016– March 2017	837	3rd WHO Classification	425	25 *	16	246 *	125
March 2016– March 2017	837	4th WHO Classification	425	20 **	16	251 **	125

* Diagnoses based on the 3rd edition WHO classification using all available tissue sections. ** Revised diagnoses according to the 4th edition WHO classification criteria for only 86 cases in this study. Abbreviations: PTC, papillary thyroid carcinoma; FTC, follicular thyroid carcinoma; WHO, World Health Organization. Other malignant thyroid tumors include poorly differentiated carcinoma, anaplastic carcinoma, medullary carcinoma, and malignant lymphoma. Non-malignant tumors include benign and borderline thyroid tumor and hyperplastic nodules.