The number of patients is the approximate number reported. Data on brain abnormalities are based on T 2-weighted MRI of the head with fluid-attenuated inversion recovery (FLAIR). Unless otherwise ...

Encephalitis can be characterized as either primary or secondary. Whereas primary encephalitis arises when a virus or other type of agent directly infects the brain, secondary encephalitis is due to ...

- a rare chronic progressive encephalitis caused by the measles virus and occurring primarily in children and young adults; death usually occurs within three years; characterized by primary measles ...

- inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) ...