Bob Novak caught a lot of grief for that incident last week in which he struck a pedestrian in downtown DC and then kept driving until flagged by a bicyclist. Novak said he didn't realize he'd hit anyone. And he may have been telling the truth. According to the Associated Press this is sometimes a symptom of a brain tumor ...

Last week, Novak was given a $50 citation after he struck a homeless man with his black Corvette in downtown Washington. Novak kept going until he was stopped by a bicyclist, who said the man was splayed on Novak's windshield.

Dr. Lynne Taylor, a neuro-oncologist at Virginia Mason Medical Center in Seattle, said residents at the hospital are taught to check for brain tumors in patients who report having a recent car accident in which they didn't realize they struck something.

"People get spatial and visual neglect of a certain part of their bodies and they don't realize they've done what they've done," said Taylor, a fellow with the American Academy of Neurology.