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Nine occult carcinomas of the thyroid were found in 157 autopsies of deceased residents of Olmsted County, Minnesota, a prevalence of 5.7%. This rate is significantly lower than that reported from a previous autopsy series from Hiroshima-Nagasaki, Japan, in which similar pathologic methods and diagnostic criteria were used. Sex ratio, age distribution, and radiation exposure are considered not to explain this difference. A true difference between the Japanese and American populations with respect to the prevalence of occult thyroid carcinoma is the most likely explanation of these findings.
Sampson et al. (Sun,) studied this question.
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