Florida's Krys Barch collided with Paille early in the first period and the Bruins' forward did not return. After the hit, he lay on the ice for a few moments and was tended to by team trainer Scott Waugh. Paille skated off on his own but did not return.
"Not a concrete update," said Bruins coach Claude Julien. "As you know, he got dinged pretty good and our doctors felt it was safer to not let him return and he was examined a little bit further. He wasn't well enough to come back."
Julien admitted Paille was taken to the hospital to be examined.
"He's being examined right now," the coach said. "They're looking at it. They haven't come to a conclusion yet, but as I mentioned, when I looked at it in slow motion, it was almost like both heads banged at first before the check was finished. Definitely, we're being cautious there and he's going to be examined."
Julien watched the replay of the collision and didn't think there was anything wrong with the hit on either side. Barch received a two-minute minor penalty for charging on the play.
"It was a clean hit," the coach said. "I think it's just how he ended up going down, and it almost looked like it was helmet-to-helmet collision in slow motion. We'll see what comes out of that."
"It was unfortunate that he got hit like that," said Bruins defenseman Johnny Boychuk. "It was good to see Thorty step up and handle (it). It's nice to see when a guy goes down like that his teammates are there to back him up."
Paille suffered a serious facial injury against the New York Islanders on Nov. 7 at the Garden and needed surgery to repair a broken nose after he was hit in the face by a slap shot.
He only missed three games and when he returned he wore a full cage to protect his face. Thursday was his second game without the cage.
Joe McDonald covers the Bruins for ESPNBoston.com.