[The new international histological classification of thyroid tumors].

The International Agency for Research on Cancer (IARC) published the new 4th Edition of the WHO Classification of Tumors of Endocrine Organs in 2017. As the previous 2004 edition, the new classification gives considerable attention to thyroid neoplasms. The nomenclature of thyroid tumors undergone changes based on the clinical, morphological and molecular genetic findings obtained for the expired period, on respective new views of their malignant potential, and on the prognosis of a number of neoplasms that should be taken into consideration by pathologists in their daily diagnostic practice. The aim of this paper is to present the new Edition of Classification of Thyroid Tumors with an emphasis on the changes made.