What Kennedy's diagnosis could mean

(CNN) -- Sen. Edward Kennedy has the most common type of brain tumor, but the size and nature of the tumor will determine how life threatening it is, CNN's chief medical correspondent Dr. Sanjay Gupta said Tuesday.

Sen. Edward Kennedy was diganosed with a malignant brain tumor.

Kennedy, 76, was hospitalized over the weekend after having a seizure.

Kennedy's doctors at the Massachusetts General Hospital said Tuesday that the preliminary results from the brain biopsy showed a tumor in the left parietal lobe was responsible for the seizure.

Kennedy hasn't had any seizures since his hospitalization, doctors said.

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