But the Twins received good news, as the MRI exam revealed only inflammation, according to Twins general manager Terry Ryan.
"He described some tenderness to his forearm, and that's exactly what the MRI showed -- irritation to his left forearm," Ryan said. "We're going to go day to day with him, too. We're going to leave him back in Minnesota at least two days and see how he is Wednesday."
Perkins struggled on Sunday, allowing three runs, including a two-run homer to Josh Hamilton, in the Twins' 4-3 loss to the Rangers. He didn't record an out before being removed from the game and has an 8.31 ERA in 4 1/3 innings this year.