The latest report from Fukushima on comprehensive thyroid cancer screening have confirmed over 100 children are diagnosed with thyroid cancer.
source: Asahi Shinbun

The authority and media are trying to control the impression to domestic public by calling “over diagnose” and “screen effect” as the reason for high number.

First of all, for Fukushima case we do not need to discuss “over diagnose”. “Over diagnose” is an argument for realistic problem of what to do about condition found as the result of comprehensive screening. It does not concern accuracy of screening.

Second, so called “Screening effect” does not even exist in medical context. It is used in molecular science (refer “shield effect”).

source: The Guardian
source: Evidence Based Medicine(EBM) Japan