Three days later, Kennedy's doctors at Massachusetts General Hospital in Boston said preliminary results from a brain biopsy showed a tumor in the left parietal lobe was responsible for the seizure.

CNN: Aide: Ted Kennedy out of hospital

Shortly after, doctors diagnosed a brain tumor -- a malignant glioma in his left parietal lobe.

CNN: Massachusetts Sen. Ted Kennedy dies after cancer battle

The tumor is a malignant glioma located in Kennedy's left parietal lobe about at the top of the head.

NPR: Doctors Say Ted Kennedy Has Brain Tumor