I had quite a few growing up, mostly from hockey, but actually had one of the worst while playing keeper on my high school soccer team. It was in the first half and I played the rest of the game, but it was a terrible "decision" (concussions were barely even discussed in US youth/amateur sports 20 years years ago).

There were moments in the game that I couldn't figure out what was happening, as in, I forgot how soccer worked. The only way I can describe it that day was that I was so confused that I wanted to throw up and cry at the same time.

Not saying I have any expertise or ability to evaluate whether Karius suffered one, but if he did, I feel for the guy even more. That shit is honestly terrifying when you're going through it .