Penguins forward Jayson Megna collided with Mason with 3:33 remaining in the second period. Mason took off his helmet, blocker and glove while he kneeled in the crease during a timeout.
He played the remainder of the second period before being replaced by Ray Emery to start the third. Emery stopped 12 of 14 shots in a 4-3 overtime win.
Flyers coach Craig Berube said he was not sure of the severity of Mason's injury but expects him to be prepared to start Game 1 of the Stanley Cup Playoffs against the New York Rangers in the Eastern Conference First Round.
There's no discouragement in that room. There's no issues there at all to be honest with you. It's more about, 'Hey, it's opportunities for players.' And if we become that bad of a team because of one player, it's not a real good sign for our hockey club. So this is part of sports. It's part of hockey.
— Bruins coach Claude Julien on the loss of Zdeno Chara to injury