Abstract
From September 1978 to October 1984, we carried out mass screening for thyroid disease in Tokushima prefecture. In this survey 13, 049 subjects were examined, and the following results were obtained. 1. Thyroid abnormalities necessitating further examination were found in 334 subjects, accounting for 2.6% of the total. 2. Diffuse goiter was prevalent in younger subjects and nodular goiter was prevalent in older ones. 3. Thyroid cancer was found in eight cases. The incidence of thyroid cancer in this survey was 0.06%. Five were in stage I and three in stage II. 4. Simple diffuse goiter and chronic thyroiditis showed higher incidences than other benign thyroid diseases. 5. Mass screening was useful in detecting early thyroid cancer and in surveying incidences of other benign thyroid diseases.
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