Medical Report:
Chief Justice John G. Roberts Jr. has “fully recovered” from the second seizure of his life (2007), the Supreme Court’s communications office said in a statement. That’s consistent with a majority of seizure cases, according to Dr. Marc Schlosberg, a neurologist at Washington Hospital Center. He told The Associated Press that most patients feel that they are back to normal in 10 or 15 minutes. But once you’ve had two, a third seizure is more likely, a neurosurgeon added.
From NY Times July 31, 2007:
Statistically, he said, it is “extremely unlikely” that this seizure represents a brain tumor. Fewer than 5 percent of those with recurrent seizures have brain tumors as a cause, and a very slowly progressing brain tumor would be rare.
Epilepsy is a common condition among Americans. The approximate risk of having a single seizure in one’s lifetime is 9 percent. By Chief Justice Roberts’s age, the risk is 7 to 8 percent. About 3 percent have a recurrence, and 1 percent of Americans at any one time are under treatment for epilepsy.
http://www.nytimes.com/2007/07/31/washington/31roberts.html?hpRoberts does not appear to be at a high health risk.