If this doesn't make you atheist, nothing will. Teratoma tumours are composed from the cells of other organs, so they can grow hair, teeth and eyes - like some kind of malformed foetus demon. In fact, the name itself comes from the Greek word for "monster", and they can actually possess you. Kiera Echols woke up one day in a mental institution diagnosed with schizophrenia; though she had never suffered with psychological problems in her life. After extensive research, doctors eventually found a teratoma on Echols' ovaries. It had teeth, bone, hair, and an entire nervous structure around it; attacking her brain and sending the poor lady psychotic. At one point she'd even asked to be exorcised.
