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FORMULA 1 legend Michael Schumacher has reportedly undergone a second brain operation after suffering a brain haemorrhage in a skiing accident.
The 44-year-old German is in a critical condition in a French hospital with a brain haemorrhage after a skiing accident.
According to French media reports, neurosurgeons performed a second operation on Schumacher's brain.
A press conference on the champion's condition will be held at 9pm AEDT.
Schumacher was "suffering a serious brain trauma with coma on his arrival, which required an immediate neurosurgical operation," the hospital in the southeast French city of Grenoble said in a statement.
"He remains in a critical condition."
Michael Schumacher pictures while announcing his retirement from Formula 1 at the end of the 2012 season.
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The hospital statement was signed by the facility's neurosurgeon, the professor in charge of its anaesthesia/revival unit, and the hospital's deputy director. It was issued jointly with the ex-racer's press team in Germany.
Schumacher had been skiing off-piste in the upmarket Meribel resort when he fell and hit his head on a rock, mountain police who gave him first aid said.
Schumacher, who lives with his family in Switzerland, was on a private stay in Meribel, according to his spokeswoman.
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Meribel is part of an extensive ski region with about 180 lifts connecting three alpine valleys.
Schumacher was reportedly skiing with his 14-year-old son at the time of the accident.
He was airlifted to a local hospital, then to the Grenoble facility. A specialist neurosurgeon from Paris was rushed in to oversee his treatment.
The director of the Meribel resort, Christophe Gernigon-Lecomte, had said just after the accident that Schumacher had been wearing a helmet and was "conscious but a little agitated'' just after the accident, with early reports suggesting there was no cause for alarm.
But when Schumacher then fell into coma, doctors realised the damage was worse than initially feared.
Jean Marc Grenier, the deputy director of the hospital, speaks to the press.
The two mountain police officers who gave first aid said Schumacher was suffering "severe cranial trauma'' when they got to him and a helicopter was brought in to evacuate him within 10 minutes.
A renowned Paris surgeon, Dr Gerard Saillant - who also operated on Schumacher when he broke his calf and shinbone during his most serious racing crash at the 1999 British Grand Prix - was brought to the Grenoble hospital in a police car to take charge of the famous patient.
A hospital spokesman said the next update on Schumacher's condition would be given at 10am GMT (9pm AEDT).
Police officers have been stationed to guard the hospital's entrances.
Dr Gary Hartstein, former Medical Delegate for the Formula 1 World Championship, took to Twitter to attempt to explain the medical situation Schumacher finds himself in.
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"It's quite well known that extradural hematomas, a kind of cerebral hemorrhage, can leave a lucid interval after injury," he wrote, referring to reports that Schumacher was conscious when he was attended to after the accident.
"Then as the hematoma forms, the sudden increase in pressure causes sudden and dramatic symptoms. Pressure must be relieved rapidly.
"This is done with a neurosurgical intervention. Then the victim is observed in an ICU environment.
"Quality of recovery depends on: 1) severity of initial injury, 2) acuteness and amplitude of pressure rise when hematoma forms, 3) rapidity with which it is drained, 4) quality of neuro intensive care and rehab."
Dr Hartstein said that the long wait for the next update on Schumacher's condition is no surprise.
A helicopter in front of the Grenoble hospital, French Alps, where Michael Schumacher is being treated after he sustained a head injury during a skiing accident in Meribel, France.
"Gives docs a chance to do rounds, see new CT scans, check blood results. That is perfectly fine.
"What we want to hear is: 1) off or starting to come off the respirator. 2) intracranial pressure staying normal. If we hear this, we're ok.
"And obviously anything better is, well, better."
Schumacher retired from Formula 1 for a second time at the end of the 2012 season. He won two world titles with Benetton and five in a row with Ferrari.
Schumacher has had accidents before, including a motorcycle crash in February 2009 in Cartagena, Spain, where he damaged a vertebra, a rib and the bottom of his skull.
A file photo shows Michael Schumacher skiing in the Italian Alps in 2006. Schumacher is in a critical condition after hitting his head in a fall while skiing.
At the time, his doctor, Johannes Peil, said it had caused the racer the most serious long-term harm of his career.
That accident prevented him taking the place of Felipe Massa at Ferrari after the Brazilian suffered severe head injuries in a crash at the Hungarian Grand Prix in 2009.
He recovered from the injuries to make a shock return in 2010 at Mercedes alongside Nico Rosberg.
Though his countryman largely outshone the former champion in their three seasons together, we did see flashes of the old Schumacher.
At Monaco in 2012, the then 43-year-old five-time winner at the principality scored a popular pole position, although he would not start there on race day thanks to a 10-spot grid penalty earnt at the previous race.
A file pitcure of Michael Schumacher from his Ferrari days, Schumacher is in a critical condition after hitting his head in a fall while skiing.
That lap, along with a podium finish at Valencia the same year, were the high watermarks of his otherwise ill-fated comeback.
