reyjon, it In believed Che beta enery bes weve: boa week Co tive cont rbbuted significantly to the thyroid dose, In 1963, 9 years after exposure to fallout, the first thyroid nodule was detected in a 12 year old.girl in the more heavily exposed group. Subsequently there have been increasing numbers detected, nodules were detected; in March, 1965, In 1964, 2 further 5 other cases were noted and —_——_—_— i 28, PPSERENE” hypothyroidism in two boys who had shown growth retardation, in addition In September, 1965, 5 further cases were detected and this past March five more cases were found, This makes a total now of 16 cases with nodules plus two cases of hypothyroidism, Only one nodule has been found to be malignant. Table I summarizes the incidences of thyroid abnormalities in the various populations examined, have been 79% of children Note that there fa the more heavily exposed group exposed ato less than 10 years of age with thyroid abnormalities, in comparison with no thyroid pathology noted in children of the same age range of the nonexposed population or in the lesser exposed populations. The incidence in those exposed at a greater age is considerably lower and not much higher than that seen for the unexposed population or less exposed population, Tt should be noted that: the only nodules noted in the unexposed population were in the older age group, that is, greater than 50 years of age, Thyroid surgery has been performed on 11 cases with nodules, Ten of these cases, 9 children ( and one adult) were all found to have benign nodules and one 41 year old woman had cancer, Four other children in the exposed group will have their thyroid nodules reevaluated in September 1966°% Athyroid77 nodule in one adult male disappeared while on hormone therapy. “~ ? (et? In most cases the thyroid glands contained multiple nodules ranging in diameter from a few millimeters to a few centimeters. firm, others cystic, and sometimes even hemorrhagic, noted, All were nontender, some No lymphadenopathy was The microscopic sections of the benign lesions showed quite bizzare appearance with a wide variety of different sized follicles, some small and‘