Dr. Eugene Flamm, chairman of neurosurgery at Montefiore Medical Center and Albert Einstein College of Medicine in New York City, agreed. He stressed that the low-velocity, low-impact type of accident that Richardson seems to have experienced would typically not result in a grave outcome.
Such outcomes are "pretty rare," Flamm said. However, he added that it was certainly a possibility that physicians hold in their mind when seeing patients.
"It's quite unusual, but we see a lot of people in the emergency room and if they have a head injury and the scan is OK, we send them home but with instructions to 'look out,' " Flamm said. "I don't think any neurologist would say they had never heard of this scenario."
Richardson, who has appeared in several movies and won a 1998 Tony Award for her performance in Cabaret, is married to the actor Liam Neeson. The couple's two sons were reportedly with Richardson on the ski holiday.
Neeson reportedly flew from filming a movie in Toronto to be with his wife of 15 years.
The actress Vanessa Redgrave, Richardson's mother, was seen entering Lenox Hill Hospital Tuesday night "looking somber," The New York Times reported. Her sister, actress Joely Richardson, was also spotted entering the hospital, CNN reported.
But there are so many missing details of what happened on the slope in Canada that really anything could still be possible, the medical experts said.
Learn more about traumatic brain injury at the U.S. National Institute of Neurological Disorders and Stroke.
SOURCES: Arno Fried, M.D., chairman of neurosurgery, Hackensack University Medical Center, New Jersey; Steven R. Flanagan, M.D., director, Rusk Institute of Rehabilitation Medicine, New York University Medical Center, New York City; Eugene Flamm, M.D., chair of neurosurgery, Montefiore Medical Center and Albert Einstein College of Medicine, New York City; Bloomberg News; CNN; The New York Times