Osteosarcoma Arising From a Cervical Teratoma in a 4-year Old Child: A Report of a Rare Case and Literature Review.

Cervical teratomas consist of about 3% of all teratomas, and commonly present in childhood. They are often benign and very rarely turn malignant. Malignant transformation of teratomas occurs in about 3% - 6% of such tumours, and often results in carcinomas, and infrequently, sarcomas and yolk sac tumours.