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BOSTON -- Jonas Gustavsson started Tuesday night's game for the Bruins, but he was not around to see the end of it.

The veteran goaltender exited Boston's matchup with the Anaheim Ducks after the first period and was replaced by Tuukka Rask. The team later announced Gustavsson was dealing with an illness and had been transported to Massachusetts General Hospital for further observation.

Gustavsson, who allowed two first-period goals on 16 shots Tuesday, had won four of his previous five starts, including one he was forced to make Saturday night after Rask was held out as a late scratch.

Bruins coach Claude Julien said after Saturday's game, which his team won 3-2 over Columbus Blue Jackets in a shootout, that Rask "wasn't 100 percent -- nothing major." It remains unclear exactly what ailment was hindering Rask.

Winger Matt Beleskey also missed one Bruins practice this week with an illness but returned to play the following night.

Thuumbnail photo via Timothy T. Ludwig/USA TODAY Sports Images