(UPDATE: See my latest post. Total 1143 children out of 3765 tested had lumps on the thyroid.)
(Let's repeat the refrain: "It has nothing to do with radiation".)
From Jiji Tsushin (1/25/2012):
0.7% of children under the age of 18 have developed lumps [on the thyroid] more than 5 millimeters in diamater: "Hard to believe" there is any effect of radiation, says Fukushima prefectural government
On January 25, the Fukushima prefectural government announced for the first time the result of the early test of thyroid gland on the children who were in Fukushima Prefecture and were under the age of 18 at the time of the Fukushima I Nuclear Power Plant accident. Of 3765 children who were tested with ultrasound, 26 children or 0.7% of the children tested were found with lumps that measure more than 5.1 millimeters in diameter.
Fukushima Medical University, who conducted the test, says, "They are benign lumps. It is highly likely that these lump had existed before, and it is hard to believe there is any effect of radiation". However, just in case, the university will conduct additional ultrasound testing and blood testing.
The early test was done on children who lived in Namie-machi, Iitate-mura, and Yamakiya District of Kawamata-machi at the time of the accident. Most of the 26 children are over the age of 6, and according to the Fukushima prefectural government there was no case of suspected cancer.
Fukushima Medical University, as you recall, has Dr. Shunichi Yamashita as the vice president. He and his associates are responsible for telling the residents in Iitate-mura and other high radiation cities and towns in Fukushima that it was safe to be outside, to eat vegetables, to drink water, when the radioactive fallout was falling heavily in Fukushima in March and April.
Of course these lumps are benign. They have to be.