Felipe Massa has undergone 'positive' emergency surgery after suffering skull damage and concussion in his high-speed accident during qualifying for the Hungarian GP.

In a short statement, Ferrari confirmed that the 'Outcome of the procedure was positive' and that Massa would remain in observation in intensive care.

Massa was injured after being hit by a piece of debris that is believed to have fallen off the rear of Rubens Barrichello's Brawn. He then, whilst already apparently unconscious in his Ferrari, slammed into a tyre wall.

Ferrari will release a further update on his condition on Sunday morning.

Immediately after he was air-lifted to hospital in Budapest, Ferrari revealed that their driver "was conscious at the arrival at the hospital and his general conditions remain stable.

"Following a complete medical examination it emerged that he had suffered a cut on his forehead, a bone damage of his skull and a brain concussion. These conditions need to be operated on."

It's believed that the force of the impact when Massa hit the tyre-wall resulted in a suspension failure that in turn caused the side of his helmet visor to be ripped off. Massa suffered cuts just above his left eye. The eye itself is not thought to have been damaged during the accident.

An update on his condition will be issued late tomorrow morning.