Teratoma

Teratoma
Pathology
Type	Cancer
Cause(s)	Uncontrolled division of undifferentiated cells into a specialized tissue
Symptoms	Usually asymptomatic, although they often project on the outside of the body and can be detected with ultrasound or other radiological investigation
Mortality rate	Low
Treatment(s)	Usually monitoring, although surgery may be recommended when the teratoma interferes with blood flow or presses against a duct
Appearance(s)	Changes

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