BOSTON -- Bruins center Patrice Bergeron left halfway through the second period of the Bruins-Senators game and will not return. There was no further information on his status. Bergeron was coming back to help in the defensive zone and inadvertently ran his head into the elbow of Senators center Colin Greening. He fell to the ice and took some time to get up before heading down the ramp to the Bruins dressing room.

With Bergeron's history of concussions -- three in his career -- there was obviously major concern at TD Garden. Bergeron, who currently leads the team in points with 31 and assists with 21, missed the majority of the 2007-08 season with a severe concussion. He suffered another concussion the following season, but returned to play. He then missed time in the 2011 Eastern Conference Finals with his third concussion but returned to action once again.

Bruins defenseman Dougie Hamilton left the game briefly in the third period after laying a huge hit on Erik Condra. Hamilton seemed to get the worse of it and exited for the dressing room, but returned to play moments later.