Have you heard of teratomas? Warning, they are GROSS! But they are basically the biological Wonder Balls of the human body.

They are basically tumors of flesh and within them reside tissue and structures native to the human body. They can be filled with hair, teeth, tissue resembling that of organs and boy are they a sight.

Even eyes can be grown in them!
I remember I saw a show documenting a woman who was going through severe psychological disturbances. Turns out the source of her psychosis was a teratoma filled with brain cells! And because her body was attacking the foreign tumor, it regarded her own brain as an enemy and began attacking it.
Here are pictures of actual teratomas.



Baby had a teratoma in his head. It formed a foot in his brain!