The condition of German motor racing star Michael Schumacher has improved slightly after a second operation to relieve pressure on his brain. His doctors say, the seven-time Formula 1 champion suffered head injuries on Sunday in a skiing accident in the French Alps.The 44-year-old remains in intensive care at a hospital in Grenoble.Doctors say, Schumacher, who is being kept in a medically induced coma, is still not out of danger. An initial scan on Monday night showed an improved situation and indicated a window of opportunity for a second operation. Doctors said, it is impossible to give a prognosis for his condition in the coming days and months.