Interesting stuff - finding the balance between not missing important thyroid cancers, and not over-diagnosing thyroid cancers that are not likely to cause any ill-health, remains a challenge. Looks like Korea is moving towards a more conservative approach, more in line with the more typical international approach. Seems sensible to me.
I liked this story - a TV host in the US received a message from a concerned viewer, suggesting he get his visible thyroid nodule checked out. It turns out to be thyroid cancer, from which he is now doing well.
Thyroid cancer diagnosis, from your armchair!