Colton Stormont, the 5-year-old Gorham boy who was accidentally run over by his family’s sport utility vehicle on Saturday, underwent surgery Monday and was listed in serious condition at Maine Medical Center in Portland.

The boy’s mother, Cassandra Stormont, posted a message on her Facebook page that said Colton underwent surgery on his right arm.

“Surgery went as planned with all best case scenarios. His arm is set, has some temporary hardware, is in a splint with an ace wrap and sling,” Stormont wrote.

Colton is recovering in the hospital’s pediatric intensive care unit. His mother said he suffered a bruised lung, fractured ribs, two broken arms and a fractured skull.

Colton had been playing in the parked 2007 Jeep Liberty when it unexpectedly rolled down the driveway and across Route 237. The ignition key was not in the vehicle at the time, his mother said.

Colton was injured when he jumped out of the moving SUV.

A friend of Josh Stormont, the boy’s father, has created a fundraising campaign on the social media website GoFundMe to help the Stormonts with medical costs. More than $3,700 had been raised as of Monday night.