Bruins' Mark Kastelic leaves game with lower-body injury and will not return

Boston Bruins forward Mark Kastelic left Tuesday night's game against the New York Islanders with a lower-body injury and will not return, the team announced.

Kastelic was injured in the first period after taking a hit from Islanders defenseman Sebastian Aho. He immediately went to the dressing room and did not return.

The Bruins did not provide any further details on the extent of Kastelic's injury, but it is believed to be serious.

What does this mean for the Bruins?

Kastelic's injury is a big blow to the Bruins, who are already without several key players, including Brad Marchand, Charlie McAvoy, and Matt Grzelcyk.

Kastelic has been a regular in the Bruins' lineup this season, playing in 40 games and scoring six goals and adding eight assists.

With Kastelic out, the Bruins will likely have to call up a player from their AHL affiliate, the Providence Bruins.

What's next for Kastelic?

Kastelic will likely undergo an MRI on Wednesday to determine the extent of his injury.

If the injury is serious, Kastelic could be out for an extended period of time.

The Bruins will provide an update on Kastelic's condition once the MRI results are known.