Injury Report: What exactly happened to Steve Mason?

This is not a good sign for the Philadelphia Flyers or Steve Mason. Mason was forced out of Wednesday's morning practice after only a few minutes. He had only just started his workout before leaving for good. According to reports, Mason will undergo an MRI to determine the extent of his injury. There was a particular moment in last night's game where Mason seemed to move awkwardly. The expression on his face seemed to be one of wincing pain. Mason does have a history of back injuries, and he most recently missed two games earlier in the season due to back spasms. Hopefully it is not too serious.