U.S. Sen. Edward M. Kennedy has a malignant brain tumor, doctors treating him at Massachusetts General Hospital said Tuesday.
Sen. Edward Kennedy suffered a seizure Saturday in Hyannisport, Massachusetts.

Kennedy, 76, was hospitalized Saturday morning after suffering a seizure at his family's compound at Hyannisport, Massachusetts.

"Preliminary results from a biopsy of the brain identified the cause of the seizure as a malignant glioma in the left parietal lobe," according to a statement from the doctors treating the senator.

White House spokeswoman Dana Perino said President Bush was "deeply saddened" by the news and would keep the senator in his prayers.

Malignant glioma is the most common primary brain tumor, accounting for more than half of the 18,000 primary malignant brain tumors diagnosed each year in the United States, according to the National Cancer Institute.

Sen. Ted Kennedy was diagnosed with a malignant brain tumor and will seek the best treatment possible. Something that he would want for every cancer patient, says Katie Couric. (CBSNews.com)

Obama remarks on the living legend Ted Kennedy regarding the news of Senator Kennedy's malignant brain tumor, stating, "I think you can argue that I would not be sitting here as a presidential candidate had it not been for some of the battles that Ted Kennedy has fought. So not only is he a personal friend, not only has been one of my most important supporters during the course of this campaign. But he is somebody who battled for voting rights and civil rights when I was a child. I stand on his shoulders..."

Senator Robert Byrd cries and talks as if Ted Kennedy has died....Ted Kennedy Malignant Brain Tumor Cancer Cries Emotional Breaks Down Teary Eyed Robert Byrd KKK