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.
We've got to find a way to win a game. He's played well in the minors, now he gets his opportunity. We tried [with Jonathan Bernier]. The way I look at it, you get opportunities and you make the most of it. That's what [James Reimer] did. Now another opportunity is here and Sparks ... you gotta grab it. Is he ready? We'll find out.
— Maple Leafs coach Mike Babcock to the Toronto Star on recalling goalie Garret Sparks from the AHL to start Monday in his NHL debut
TONIGHT ON NHL NETWORK
5:00 ET: NHL Live Powered by Constellation 7:00 ET: NHL Tonight