Uncontrolled division of undifferentiated cells into a specialized tissue
Usually asymptomatic, although they often project on the outside of the body and can be detected with ultrasound or other radiological investigation
Usually monitoring, although surgery may be recommended when the teratoma interferes with blood flow or presses against a duct
A Teratoma is an encapsulated tumor with components of tissues and organs. The tissues and organs of the teratoma may be different: hair, tooth, bone and also eye, hand and foot.
Teratoma at Wikipedia