Rudolph was released from the hospital later on Sunday, according to ESPN's Adam Schefter, who added he is "resting at home" and will now be in the NFL's concussion protocol. 

Rudolph, 24, went down on a hit by Earl Thomas as he attempted to make a throw, with his head hitting the field as he went to the ground. He was able to walk off the field on his own power. The Steelers medical staff had initially brought out a cart to the field, but it malfunctioned. 

Former Steelers quarterback Charlie Batch tweeted that Rudolph was being transported to the hospital. 

NFL on ESPN @ESPNNFL

Steelers QB Mason Rudolph left today's game against the Ravens after taking a scary hit in the 3Q. Devlin Hodges is now under center making his NFL debut.

Michael David Smith @MichaelDavSmith

I'm glad Mason Rudolph is capable of walking off the field but the NFL needs protocols in place to ensure players knocked unconscious can be immobilized and carted off safely. Apparently there was something wrong with the cart in Pittsburgh? That's unacceptable.

Brian Batko @BrianBatko

The scene at Heinz Field as they bring cart out for Steelers quarterback Mason Rudolph, who took a helmet hit from Earl Thomas on a throw as he left his feet.

Charlie Batch @CharlieBatch16

Mason is headed to the hospital now

Before exiting, Rudolph was 13-of-20 passing for 131 yards and a touchdown without an interception. 

In his second NFL season, Rudolph took over as the Steelers starting quarterback after Ben Roethlisberger suffered a season-ending elbow injury. He's led the team to a 1-1 record as a starter, throwing for 515 yards and six touchdowns against two interceptions entering Sunday. 

"I'm excited to step up," Rudolph told reporters after being named starter. "That's what backups do. That's what I've done my entire career, whether it be high school, college or now. Nothing different for me.

"I try to prepare like I'm the starter when I'm not, and I'm going to continue to go through my same weekly routine, put a good game plan together with the staff and go execute."

Undrafted free agent Devlin Hodges took over for Rudolph.