Kucherov exits vs. Bruins with apparent injury
Kucherov was high-sticked by Zdeno Chara in the opening frame.
The Lightning winger left the game after Chara's four-minute penalty and briefly returned only to exit again late in the second period.
Kucherov has been the driving force of Tampa Bay's offense so far in the postseason, recording 16 points in 12 contests entering Monday's pivotal contest.
The Lightning can ill afford an absence of any sort for Kucherov, as the club is already without captain Steven Stamkos.