A teratoma is an unusual, and normally benign, tumor that usually appears in the ovaries, testicles or tailbone and only occasionally in other parts of the body. These are encapsulated tumors that are formed from other body tissues; hair, teeth, bone, thyroid tissues, etc. Derived from the Greek word for "monster" these types of tumors are found in approximately 25% of ovarian tumor cases and 50% of testicular cancer cases. This condition is treated by surgery.

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