The doctors said a scan carried out after an overnight operation indicated that he was “better than yesterday”, but the former F1 champion was still “not out of danger”.
Michael Schumacher, 44, suffered head injuries on Sunday in a skiing accident in the French Alps.
He is in a medically induced coma at a hospital in Grenoble.
An initial scan on Monday night showed “an improved situation” and indicated a window of opportunity for a second operation, doctors said.
The family took the “difficult decision” to give consent for the procedure, and doctors operated on Michael Schumacher for about two hours.
A subsequent scan revealed a “slight improvement”.
“We can’t say he is out of danger but… we have gained a bit of time,” said Dr. Jean-Francois Payen.
“The coming hours are crucial.
“All the family is very much aware that his state is still sensitive and anything can happen.”
Doctors said it was impossible to give a prognosis for his condition in the coming days and months.
Michael Schumacher had been skiing off-piste with his teenage son when he fell and hit his head.
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