Will be in hospital a few more days

Kennedy's treatment won't be determined until he undergoes more tests. Tumors are graded from 1 to 4, from slow growing to aggressive.

Kennedy's doctors said he will remain in the hospital for the next couple of days as they consider what to do.

"He has had no further seizures, remains in good overall condition and is up and walking around the hospital," said a joint statement by Dr. Lee Schwamm, vice chairman of the Department of Neurology at Massachusetts General Hospital and Dr. Larry Ronan, Kennedy's primary care physician.

Some outside experts gave him no more than three years — and perhaps far less.

"As a general rule, at 76, without the ability to do a surgical resection, as kind of a ballpark figure you're probably looking at a survival of less than a year," Dr. Keith Black, chairman of neurosurgery at Cedars-Sinai Medical Center in Los Angeles, told The Associated Press.