A fetus with a mass in the oral cavity: a rare case of oral immature teratoma

摘要

Teratomas are congenital germ cell tumors composed of diverse tissues of ectodermal, mesodermal, and endodermal origin with variable levels of maturity. Immature teratoma is an uncommon prenatal finding, which was rarely reported in the oral region. We herein report a unique case of a male neonate with a mass arising in his oral cavity. Ultrasonic studies diagnosed it as fetus-in-fetus or teratoma and pathological studies of the resected mass provided supportive evidence for the case of an oral immature teratoma. To our knowledge, there are few cases of oral immature teratoma arising in the fetus reviewing the literature.