[Comparative quantitative electron-microscopic study of the nucleoli of human thyroid oncocytes and follicular cells].

The qualitative and quantitative ultrastructural examinations of nucleoli of follicular cells and oncocytes of human thyroid revealed no morphological differences between these two types of cells and confirmed the presence of all structures necessary for normal functioning. Oncocyte nuclei are not carriers of morphological alterations which could have indicated severe functional disorders in these cells, and morphological and morphometric examinations indicated functional intactness of nuclei and nucleoli.