The Boston Celtics got a rare, brief and encouraging glimpse of Shaquille O'Neal before he limped off to the locker room Sunday night. They can only hope it wasn't their last. The 39-year-old former NBA MVP returned Sunday night after missing more than two months and scored six points in 5 1/2 minutes to help Celtics beat the Detroit Pistons 101-90. But O'Neal left in the second quarter with a new injury that raised new questions about whether he will be able to contribute in the playoffs. "I don't know what to do, honestly," Celtics coach Doc Rivers said when asked if O'Neal should be shut down for the rest of the regular season. "My inclination is not, because he needs to play. We have to play at full-tilt in six or seven [games]." Read more: http://sports.espn.go.com/nba/recap?gameId=310403002