Doctor explains how a misdiagnosis of multiple sclerosis happens amid Christina Applegate news

Actress Christina Applegate revealed on her podcast Tuesday that she had been misdiagnosed with multiple sclerosis. CBS News' medical correspondent Dr. Cèline Gounder explains what could have happened.

Actress Christina Applegate revealed on her podcast Tuesday that she had been misdiagnosed with multiple sclerosis. CBS News' medical correspondent Dr. Cèline Gounder explains what could have happened.