Washington Mystics star forward Elena Delle Donne has a small disk herniation in her back, an MRI taken Wednesday showed.

The reigning WNBA MVP left just minutes into Tuesday's Game 2 loss to the Connecticut Sun with what the team initially called back spasms.

The MRI showed the disk herniation, and the Mystics say Delle Donne is currently undergoing treatment. They declined to specify what kind of treatment.

Game 3 of the best-of-five WNBA Finals series, which is tied 1-1, is Sunday. The team said it will have an update on Delle Donne's status Saturday.

Delle Donne played just 3 minutes, 28 seconds Tuesday before heading to the locker room, and the team announced in the fourth quarter that she would not return. She was not in the locker room after the game and didn't address the media.

Coach Mike Thibault said after the game that when Delle Donne went up for her first layup, her back "grabbed on her," and she immediately asked to be subbed out.

Thibault is scheduled to speak with reporters on a conference call Thursday afternoon.