It was a scary scene earlier when Red Sox lefty Rich Hill threw a pitch, grabbed at his elbow, and had to come out of a game. One's immediate thought was that something in Hill's elbow had torn, and that he'd probably need to have surgery or at the very least go for a long rehab. But so far, we have tentative good news. Via Ian Browne:

Hill left the game with a left forearm injury.

And via Scott Lauber:

Rich Hill en route to getting MRI. According to Daniel Bard, Hill passed initial tests of ucl ligament in elbow and said he'l be OK

Hill isn't yet out of the woods, and the MRI will reveal what - if anything - is wrong. But the fact that he passed tests on his UCL eases fears that he might be in for Tommy John surgery. Presumably, you can't pass those tests if your UCL is messed up. Otherwise the tests wouldn't have a point.

It's worth noting that Hill is both the only left-handed member of Boston's bullpen, and the only pitcher in team history to begin his Red Sox career with 15 consecutive scoreless outings. If Hill has to go on the DL, one figures Hideki Okajima could return from the minors.