If you don't use your brain it turns to mush.

BOSTON — Sen. Ted Kennedy has been diagnosed with a malignant brain tumor, FOX News confirms.

Doctors for the Massachusetts Democrat said Tuesday that "preliminary results" from tests conducted on Kennedy after a seizure sent him to the hospital over the weekend confirmed the diagnosis.

"Preliminary results from a biopsy of the brain identified the cause of the seizure as a malignant glioma in the left parietal lobe," the doctors said in a statement, adding that treatment would likely include "combinations of various forms of radiation and chemotherapy.