For roughly 1 in every 10,000 people who are exposed to common viruses, like herpes simplex or the flu, encephalitis develops. This potentially deadly disease, an inflammation of the brain, is caused by the viruses ability to invade the brainstem. But why does this happen to a small subset of otherwise healthy children? 
Things aren’t always what they seem – especially in the medical realm. That's precisely what surgeons in Japan discovered when performing an emergency appendectomy. Brain tissue ... in ovaries?!