DARLINGTON, S.C. -- Tony Stewart was released from a hospital Monday, a day after he was injured in a wreck at Darlington Raceway.

Stewart underwent an MRI exam on Monday morning before doctors released him from a Florence hospital, track spokeswoman Cathy Mock said. Results of the test were negative, she said.

Stewart, 30, was injured in a crash while he was leading Sunday's Carolina Dodge Sealers 400. He was approaching Buckshot Jones to make a pass on lap 227, Jones' car bobbled and moved into Stewart's path. The two collided, sending Stewart's Pontiac into the wall. Jeff Gordon then hit him from behind.

After hitting the wall, Stewart's car went back down the track as cars continued to collect behind him and he was hit hard on the passenger side by Jimmy Spencer.

He was briefly knocked unconscious and when he came to was complaining of lower back pain and numbness and tingling in his left foot.

He was airlifted to the hospital and tests Sunday night were negative, but he was held overnight for observation.