Source: Kunitz under-went MRI to determine nature of injured left shoulder

According to a source, Pittsburgh Penguins winger Chris Kunitz underwent an MRI for pre-cautionary reasons on his left shoulder this week to determine the nature of his injury. Kunitz suffered a shoulder injury in the second period of Saturday's game against the Atlanta Thrashers.

One team source told me it was initially feared that Kunitz had a low-to-mid grade acromioclavicular sprain as he has had a good deal of swelling and tenderness over the AC joint, which has prompted the Penguins to under-go further evaluation.

The extent of the injury is not believed to be serious at this point but I'm told that there is concern in the organization that it could become a lingering injury that goes from day-to-day to week-to-week.