Abstract
Three hundred rad of x rays given to the neck region of 10-day-old rats led to the development of more thyroid tumors with a shorter latent period than the same dose of x rays given to the thyroid gland of adult animals. A subsequent treatment of irradiated animals with methylthiouracil significantly increased the number of thyroid adenomas and carcinomas and shortened the latent period. The thyroid tumors examined were predominantly of a follicular type. Papillary and medullary tumor variants were observed in a few animals only.
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