It looks like Doctor Strange is going to have a very elaborate origin story played out in the beginning of his movie. According to El Miyabe at Latino review the story of Stephen Strange starts in his youth with the loss of his sister. From there he goes on to become a celebrated neurosurgeon before losing his ability in a car accident. El Miyabe lays it all down in much more detail in this video here. BEWARE OF SPOILERS.
If this is true we could be in for an exciting treat when the movie finally releases rumored to be in July of 2016.