MacArhtur was removed from Monday's loss to the Hurricanes following a collision with teammate Robin Lehner, Bruce Garrioch of the Ottawa Sun reports.MacArthur appeared to take the brunt of the hit, as Lehner was able to exit the ice under his own power. Meanwhile, a stretcher was brought on the ice for MacArthur, but the forward ended up walking off the ice with assistance from his teammates. The nature of MacArthur's injury hasn't been revealed by the Senators, but his head appeared to collide with Lehner's shoulder, suggesting a concussion might be in play. The winger, who has 26 points in 53 games, had just returned to action Monday after missing Saturday's 7-2 win over the Oilers due to the flu.