An analysis of results of treatment of sporadic thyroid cancer in 68 children and juveniles and in 119 adult patients with radio-induced carcinomas irradiated in childhood after the Chernobyl APS accident in 1986 has revealed that the sporadic thyroid cancer in children and adults with radio-induced carcinomas are highly aggressive. For all this, radio-induced carcinomas are known to have aggressive local growth that in most cases required extended operations. The surgical treatment of carcinomas allows to get survival of the absolute majority of the patients.