CLASSIFICATION FOR THYROID GLAND TUMORS (WHO, 2017): ATTENTION TO PROGNOSTIC FACTORS

Abstract

In this article we presented four main changes in the Classification for Thyroid Gland Tumors, the fourth revision (WHO, 2017) regarding the revision presented in 2004. The most essential of them are: 1) defining the «other encapsulated tumors of thyroid gland with a follicular pattem» group which are referred to the category containing boundary tumors and includes the following concepts: a follicular tumor of the uncertain malignant potential (FT-UMP), the high-differentiated tumor of the uncertain malignant potential (WDT-UMP) and a noninvasive follicular tumor with papillary and nuclear properties (NIFTP) and 2) the oncocytic tumors which were earlier considered in group of follicular adenomas / carcinomas are defined as a separate type of tumors with an independent biological entity.

Keywords

• who classification
• tumors
• thyroid gland