CBS News reports a shocking discovery that a surgeon made after operating on a 26 year old female PhD student. The woman started having difficulty understanding basic information and communicating with others, and was constantly tired so she started seeing doctors to diagnose the issue. They found a cyst in her pineal gland, a small structure deep in the center of the brain where most neurosurgeons hesitate to operate on due to the risks involved. The surgery was successfully performed earlier this month, but it came with a strange twist: the cyst was actually a teratoma, made up of different tissues often containing hair, bone and teeth. Experts believe teratomas are a result of an embryonic twin being absorbed in the body of a developing fetus. The tumor was not cancerous, and the young woman is expected to make a full recovery.