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In page Radiation effects from the Fukushima nuclear accident:

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According to the Tenth Report of the Fukushima Prefecture Health Management Survey released in February 2013, more than 40% of children screened around Fukushima Prefecture were diagnosed with thyroid nodules or cysts. Ultrasonographic detectable thyroid nodules and cysts are extremely common and can be found at a frequency of up to 67% in various studies.[26] 186 (0.5%) of these had nodules larger than 5.1 mm and/or cysts larger than 20.1 mm and underwent further investigation. None had thyroid cancer.[citation needed] Fukushima Medical University gives the number of children diagnosed with thyroid cancer as of December 2013 as 33 and concluded, "[I]t is unlikely that these cancers were caused by the exposure from 131I from the nuclear power plant accident in March 2011".[27]