Differentiated thyroid cancer presents various, frequently astonishing outcomes, not only to the patients but sometimes to physicians as well. The dynamics of progress of the neoplasm is calculating depending on the type of tumor, that is to say microscopic findings, ways of spreading and other prognostic factors, such as: age, sex, grade of histologic malignancy and the advancement of the disease. The authors of this paper try to assess the purposefulness of individual choice of surgical procedure, according to analysis of risk factors (AMES, AGES). Therefore, the surgeon should decide about the extent of the procedure depending on those factors.