AMERICA — Arizona Senator John McCain died Saturday from an aggressive form of brain cancer, glioblastoma.

According to the American Brain Tumor Association, glioblastomas are brain tumors that appear in astrocytes, star-shaped cells that make up the supportive tissue of the brain.
Glioblastomas are highly malignant and reproduce rapidly, and are supported by a large network of blood vessels in the brain. They rarely spread to other parts of the body.
They are usually found in the cerebral hemispheres of the brain, but can appear anywhere in the brain or spinal cord.
According to Popular Science, symptoms can range from general neurologic symptoms, such as headaches or seizures, to specific areas of the brain, like speech difficulty, weakness on one side of the body, or double vision.
Glioblastoma is normally diagnosed through brain imagery and then surgery. Treatment includes surgery to remove as much of the tumor as possible, then radiation and chemotherapy.