Holland's Annemiek van Vleuten is in intensive care with concussion and three fractures to her lower back following her crash in the Olympic road race on Sunday.
Van Vleuten was admitted following the horrendous downhill crash 10 kilometres from the end of the 137km race, which she was leading at the time.
A Dutch Olympic Committee official revealed she sustained "three small fractures in her spine, a heavy concussion and she has to stay on the intensive care overnight".
Van Vleuten's compatriot Anna van der Breggen went on to win the race at Copacabana beach.
Van der Breggen said: "I was really shocked when I saw the crash and it didn't look good but I had to focus and keep on with the race."
Immediately after the race, the UCI, cycling's world governing body, said in a statement: "Ms van Vleuten is conscious, able to communicate. Further medical checks currently being made at the hospital."