I'm not sure where I sit on this one.
Part of me would be glad it had been picked up on the that the school were taking an interest in the child's health though, especially these days, I'd be a little unsure as to how wise it was in these PC times.
Saying that, it struck me that maybe they wanted to pick up on potential signs of abuse in children that they might not get the chance if they ask permission for a medical examination. However, maybe it'd be a clue to something potentially wrong if permission is refused without good reason.
Is your grandson traumatised because of the examination itself or because of what they found or both?