Abstract
Current view on certain lesions of the thyroid gland has dramatically changed during last several decades, namely due to definition of some new entities and inclusion of molecular genetic methods into diagnostic process. This results in change or more precise definition of diagnostic criteria of certain entities.
In the article are discussed namely the following topics: folicular variant of papillary carcinoma, tumors of uncertain malignant potential, papillary microcarcinoma, oncocytic tumors and poorly differentiated carcinoma.