[Morphogenetic aspects of thyroid cancer with multiple growth foci]

A complex morphologic study of resected material from 54 patients with primary tumors was carried out. Multiple foci of malignant growth were found in 25 cases. Three types of tumor foci were identified: (1) primary tumor, (2) early stages of multicentral growth and (3) metastases in organs. Morpho-histochemical criteria for diagnosis of morphogenetically -- different foci of malignant growth are discussed.